FIELD OF THE INVENTION

The present invention relates to a class of novel thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine, their use to treat or prevent viral infections and their use to manufacture a medicine to treat or prevent viral infections, particularly infections with RNA-viruses belonging to the family of the Retroviridae, the family of the Flaviviridae and the family of the Picornaviridae and more preferably infections with Human Immunodeficiency Virus 1 (HIV1), Human Immunodeficiency Virus 2 (HIV2), Hepatitis C virus (HCV), Dengue virus, and enteroviruses like Coxsackievirus, Rhinovirus and Poliovirus.

BACKGROUND OF THE INVENTION

Thiazolo[5,4-d]pyrimidines and oxazolo[5,4-d]pyrimidines can be considered as structural analogues of purines, in which the imidazole moiety is replaced by a 1,3-thiazole or 1,3-oxazole ring system. Although purine chemistry is extensively described in literature, the number of medicinal chemistry papers that describe the synthesis and biological evaluation of oxazolopyrimidines and thiazolopyrimidines is limited. Apparently, the oxazolopyrimidine and thiazolopyrimidine scaffold is not very frequently used in drug discovery programs. However, biological activities of certain thiazolo[5,4-d]pyrimidines and oxazolo[5,4-d]pyrimidines have been reported. 2,5-Diaminothiazolo[5,4-d]pyrimidin-7(6H)-one, a thioisostere of 8-amino-guanine, was found to be a weak inhibitor of purine nucleoside phosphorylase (J. C. Sircar et al. J. Med. Chem. 1986, 29, 1804-1806). Thiazolo[5,4-d]pyrimidines were covered by several patent applications as activators of caspases and inducers of apoptosis (WO2008/057402), anti-angiogenic agents (WO2004/01314), growth factor receptor inhibitors (EP1731523), heat shock protein 90 inhibitors (WO2008/059368) and xanthine oxidase inhibitors (WO2007/004688). WO2008/152390 discloses thiazolo[5,4-d]pyrimidines and their use as inhibitors of phosphatidylinositol-3 kinase. WO 2008/005303 discloses vanilloid receptor 1 (TRPV1) modulating thiazolo[5,4-d]pyrimidine analogues and their use for the treatment of diseases, such as pain, arthritis, itch, cough, asthma, or inflammatory bowel disease.

2-Aryloxazolo[5,4-d]pyrimidines have been described as adenosine kinase inhibitors (M. Bauser; et al. Bioorg. Med. Chem. Lett. 2004, 14, 1997-2000). 7-Amino-5-phenylethylamino-2-furyl-oxazolo[5,4-d]pyrimidines act as brain A_2A adenosine receptor (A_2AAR) antagonists (M. H. Holschbach, et al. Eur. J. Med. Chem. 2006, 41, 7-15). 7-(Substituted-cyclopentyl)aminooxazolo[5,4-d]pyrimidines have been reported to possess tumor growth inhibitory activity (WO/2008/019124). However none of these documents teaches or suggests thiazolo[5,4-d]pyrimidine or oxazolo[5,4-d]pyrimidine derivatives having the substitution pattern disclosed by the present invention and their use as antiviral compounds.

A huge number of thieno[2,3-d]pyrimidines is already known in the art. WO 2007/102679 discloses thienopyrimidines with at position 4 a pyrrole-2,5-dione substituent which strongly inhibits IKB kinase-β (IKK-β) involved in the activation of a transcriptional factor, NF-κB, which is associated with inducing various immune and inflammatory diseases, whereby a composition comprising the compound is a useful therapeutic agent against inflammatory diseases, in particular, arthritis and cancer. WO 2007/084815 discloses 2-carboxamide substituted thieno(2,3-d)pyrimidines inhibitors of one or more of the EGFR, HER-2, c-Src, Lyn, c-Abl, Aurora-A or VEGF kinase proteins and the like possessing anti-tumor cell proliferation activity, and as such are useful in treating or ameliorating a EGFR, HER-2, c-Src, Lyn, c-Abl, Aurora-A or VEGF kinase receptor mediated, angiogenesis-mediated or hyperproliferative disorder.

WO 2006/071988 discloses certain 4,5-disubstituted thienopyrimidine derivatives which are useful for the inhibition of PDE10 enzymes, and thus are useful for treating psychiatric or neurological syndromes, such as psychoses, obsessive-compulsive disorder and/or Parkinson's disease. WO 2004/111057 discloses compounds which are particularly useful for inhibiting potassium channels Kv1.5, which are known targets for the treatment of cardiac arrhythmia in the atria such as atrial fibrillation. However, none of these documents teaches or suggests thieno(2,3-d)pyrimidine derivatives having the substitution pattern disclosed by the present invention and their use as antiviral compounds.

Marketed drugs with a purine based skeleton are known. Examples include theophylline (drug for the treatment of asthma) and azathioprine (drug for the treatment of transplant rejection). Anti-cancer drugs with a purine scaffold include 6-mercaptoguanine and thioguanine. Purines are also an important constituent of antiviral nucleosides such as acyclovir (used for the treatment of herpes virus infections) and ganciclovir (medication used for treatment of cytomegalovirus infections). Abacavir and dideoxyadenosine (ddA) are both purine nucleosides acting as reverse transcriptase inhibitors and both compounds are licensed as anti-HIV agents.

Purines display a broad range of biological activities and as a result a huge number of purine analogues is already known in the art. WO 2009/005687 discloses purine derivatives and their use as modulators of Toll-like receptor 7. Compounds and pharmaceutical compositions which selectively activate toll-like receptor 7 are useful for treating viral infections in patients. WO 2008/135232 relates to substituted purines and purine derivatives as inhibitors of Aurora A, Aurora B, Aurora C, CHK2, JNK1 α1, JNK3 and abl kinase. These compounds possess antiproliferative properties and are useful in the treatment of proliferative disorders such as cancer, leukemia, psoriasis and the like. WO 2008/094737 discloses purine derivatives as inhibitors of calcium dependent protein kinase 1 (PfCDPKI). These purines are useful for treating malaria. WO 2008/090181 relates to a new series of purine derivatives as inhibitors of Janus kinases. JAK3 kinase inhibitors have been recognized as a new class of effective immunosuppressive agents useful for transplant rejection prevention and in the prevention or treatment of immune, autoimmune, inflammatory and proliferative diseases such as psoriasis, psoriatic arthritis, rheumatoid arthritis, multiple sclerosis, inflammatory bowel diseases, systemic lupus erythematosus, type I diabetes and complications from diabetes, allergic reactions and leukemia. WO 2008/060301 also discloses 7-substituted purine derivatives as immunosuppressive drugs useful for treatment of an autoimmune disease, an inflammatory disease, a mast cell mediated disease, hematological malignancy and organ transplant rejection. However none of these documents teaches or suggests purine derivatives having the substitution pattern disclosed by the present invention and their use as antiviral compounds.

However there is a continuous need in the art for specific and highly therapeutically active compounds, such as, but not limited to, drugs for treating viral infections/diseases such as Polio, Aids, HepatitisC, Dengue fever and infections with Rhinovirus. In particular, there is a need in the art to provide antiviral compounds, which are active in a minor dose in order to replace existing drugs having significant side effects and to decrease treatment costs.

Accordingly, in view of the relatively few choices for antiviral agents effective in low doses with low toxicity profiles and manageable side effects, there exists a need in the art for identification of alternative antiviral agents for several viral diseases.

SUMMARY OF THE INVENTION

The present invention is based on the unexpected finding that certain combinations of substituents at different positions of the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine ring system, said combinations not being suggested by the prior art, are able to meet one or more of the medical needs recited herein above and to show unexpected biological properties, in particular have significant antiviral activity.

The present invention concerns the use of a compound of I, II, III or IV:

wherein

• • X is S or O;
  • R¹ is selected from the group consisting of halogen, cyano, carboxylic acid, acyl, thioacyl, alkoxycarbonyl, acyloxy, carbonate, carbamate, aryl, amino, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino, mercapto C_1-7 alkyl, C_1-7 alkyloxy;
  • R³ is selected from the group consisting of (mono- or di-) C_1-12 alkylamino; monoarylamino; diarylamino; (mono- or di-) C_3-10 cycloalkylamino; (mono- or di-) hydroxy C_1-7 alkylamino; (mono- or di-) C_1-4 alkylarylamino; (mono- or di-) arylC_1-4 alkylamino; morpholinyl; mercapto C_1-7 alkyl; C_1-7 alkoxy, aralkylthio, piperidinyl, pyrrolidinyl, homopiperazinyl and piperazinyl, wherein said piperidinyl, pyrrolidinyl, homopiperazinyl or piperazinyl is optionally N-substituted with a substituent R²⁰ selected from the group consisting of formyl, acyl, thioacyl, amide, thioamide, sulfonyl, sulfinyl, carboxylate, thiocarboxylate, amino-substituted acyl, alkoxyalkyl, C_3-10 cycloalkyl-alkyl, C_3-10 cycloalkyl, dialkylaminoalkyl, heterocyclic-substituted alkyl, acyl-substituted alkyl, thioacyl-substituted alkyl, amido-substituted alkyl, thioamido-substituted alkyl, carboxylato-substituted alkyl, thiocarboxylato-substituted alkyl, (amino-substituted acyl)alkyl, heterocyclic, carboxylic acid ester, ω-cyanoalkyl, ω-carboxylic ester-alkyl, halo C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, arylalkenyl, aryloxyalkyl, arylalkyl and aryl, wherein the aryl moiety of each of said arylalkenyl, aryloxyalkyl, arylalkyl and aryl radicals is optionally substituted with one or more substituents independently selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thioheterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino, hydrazino, alkylhydrazino and phenylhydrazino; and
  • R² is selected from the group consisting of heteroaryl and aryl groups; halogen; C_1-7 alkyl; C_2-7 alkenyl; C_2-7 alkynyl; halo C_1-7 alkyl; C_3-10 cycloalkyl; carboxy C_1-7 alkyl; carboxyaryl; C_1-7 alkoxy; C_3-10 cycloalkoxy; aryloxy; arylalkyloxy; oxyheterocyclic; heterocyclic-substituted alkyloxy; thio C_1-7 alkyl; thio C_3-10 cycloalkyl; thioaryl; thioheterocyclic; arylalkylthio; heterocyclic-substituted alkylthio; hydroxylamino; thio-acylamino; alkoxyamino; thioalkylamino; acetal; thio-acetal; carboxylic acid; carboxylic acid esters, thiocarboxylic acid; thiocarboxylic acid esters, thioesters, halides, anhydrides, amides and thioamides; hydroxyl; sulfhydryl; nitro; cyano; carbamoyl; thiocarbamoyl; ureido; thioureido; amino; alkylamino; cycloalkylamino; alkenylamino; cyclo-alkenylamino; alkynylamino; arylamino; arylalkylamino; hydroxyalkylamino; mercaptoalkyl-amino; heterocyclic amino; heterocyclic substituted arylamino; heterocyclic-substituted alkyl-amino; oximino; alkyloximino; hydrazino; alkylhydrazino; phenylhydrazino; esters, thioesters, halides, anhydrides, amides and thioamides thereof; aromatic or heterocyclic substituents substituted with an aliphatic spacer between the thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine ring and the aromatic or heterocyclic substituent, wherein said heteroaryl or aryl groups are optionally substituted with one or more substituents selected from the group consisting of halogen, C_1-7 alkyl, alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino; wherein said aliphatic spacer is a branched or straight, saturated or unsaturated aliphatic chains of 1 to 7 carbon atoms optionally containing one or more functions, atoms or radicals independently selected from the group consisting of halogen, carbonyl, thiocarbonyl, hydroxyl, thiol, ether, thio-ether, acetal, thio-acetal, amino, imino, oximino, alkyloximino, aminoacid, cyano, acylamino, thioacylamino, carbamoyl, thiocarbamoyl, ureido, thio-ureido, carboxylic acid ester or halide or anhydride or amide, thiocarboxylic acid or ester or thioester or halide or anhydride or amide, nitro, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, hydroxylamino, mercaptoamino, alkyl-amino, cycloalkylamino, alkenylamino, cycloalkenylamino, alkynylamino, arylamino, arylalkyl-amino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic-substituted alkylamino, hetero-cyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, sulfonyl, sulfinyl and sulfonamido;
  • R⁴ is selected from the group consisting of halogen, cyano, carboxylic acid, acyl, thioacyl, alkoxycarbonyl, acyloxy, carbonate, carbamate, aryl, amino, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino, mercapto C_1-7 alkyl, C_1-7 alkyloxy;
  • R⁶ is selected from the group consisting of (mono- or di-) C_1-12 alkylamino, monoarylamino, diarylamino, (mono- or di-) C_3-10 cycloalkylamino, (mono- or di-) hydroxy C_1-7 alkylamino, (mono- or di-) C_1-4 alkylarylamino, (mono- or di-) arylC_1-4 alkylamino, morpholinyl, mercapto C_1-7 alkyl, C_1-7 alkoxy, homopiperazinyl and piperazinyl, wherein said homopiperazinyl or piperazinyl is optionally N-substituted with a substituent R²¹ selected from the group consisting of formyl, acyl, thioacyl, amide, thioamide, sulfonyl, sulfinyl, carboxylate, thiocarboxylate, amino-substituted acyl, alkoxyalkyl, C_3-10 cycloalkyl-alkyl, C_3-10 cycloalkyl, dialkylaminoalkyl, heterocyclic-substituted alkyl, acyl-substituted alkyl, thioacyl-substituted alkyl, amido-substituted alkyl, thioamido-substituted alkyl, carboxylato-substituted alkyl, thiocarboxylato-substituted alkyl, (amino-substituted acyl)alkyl, heterocyclic, carboxylic acid ester, ω-cyanoalkyl, ω-carboxylic ester-alkyl, halo C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, arylalkenyl, aryloxyalkyl, arylalkyl and aryl; wherein the aryl moiety of each of said arylalkenyl, aryloxyalkyl, arylalkyl and aryl radicals is optionally substituted with one or more substituents independently selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino, hydrazino, alkylhydrazino and phenylhydrazino;
  • R⁵ is selected from the group consisting of heteroaryl and aryl groups, wherein said heteroaryl or aryl groups are optionally substituted with one or more substituents selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino; wherein R¹² is represented by the general formula V:

and wherein

schematically represents a saturated or partly unsaturated heterocyclic ring with at least two nitrogen atoms in the said heterocyclic ring and with a total of 5 to 7 atoms in the said heterocyclic ring, and optionally with one or more other heteroatoms in the said heterocyclic ring or attached to one or more carbon atoms of said heterocyclic ring, wherein one of said at least two nitrogen atoms in the heterocyclic ring is attached to a carbon atom 6 of the purine ring;

• • each substituent R¹³ of the heterocyclic ring is a group independently selected from the group consisting of halogen, nitro, C_1-7 alkyl (optionally containing one or more functions or radicals selected from the group consisting of halogen, carbonyl, thiocarbonyl, hydroxyl, sulfhydryl, C_1-7 alkoxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, acetal, thioacetal, imino, oximino, alkyloximino, amino-acid, cyano, (thio)carboxylic acid, (thio)carboxylic acid ester or amide, nitro, amino, C_1-7 alkylamino, cycloalkylamino, alkenylamino, cycloalkenyl-amino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercapto-alkylamino, heterocyclic-substituted alkylamino, heterocyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, sulfonyl and sulfonamido), C_3-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, C_3-10 cycloalkyl, aryl, arylalkyl, alkylaryl, alkylacyl, arylacyl, hydroxyl, sulfhydryl, amino, C_1-7 alkylamino, cycloalkylamino, alkenylamino, cycloalkenylamino, alkynylamino, arylamino, arylalkyl-amino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic-substituted alkylamino, heterocyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thioheterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, hydroxylamino, cyano, (thio)carboxylic acid or esters or thioesters or amides or thioamides thereof;
  • n is an integer from 0 to 6; for example n is an integer selected from 0, 1, 3, 4 or 5, preferably, n is 0, 1, 2, or 3, more preferably, n is 0 or 1, yet more preferably n is 0;
  • R¹⁰ is selected from the group consisting of formyl, acyl, thioacyl, amide, thioamide, sulfonyl, sulfinyl, carboxylate, thiocarboxylate, amino-substituted acyl, alkoxyalkyl, C_3-10 cycloalkylalkyl, C_3-10 cycloalkyl, dialkylaminoalkyl, heterocyclic-substituted alkyl, acyl-substituted alkyl, thioacyl-substituted alkyl, amido-substituted alkyl, thioamido-substituted alkyl, carboxylato-substituted alkyl, thiocarboxylato-substituted alkyl, (amino-substituted acyl)alkyl, heterocyclic, carboxylic acid ester, ω-cyanoalkyl, ω-carboxylic ester-alkyl, halo C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, arylalkenyl, aryloxyalkyl, arylalkyl and aryl; wherein the aryl moiety of each of said arylalkenyl, aryloxyalkyl, arylalkyl and aryl radicals is optionally substituted with one or more substituents independently selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino, hydrazino, alkylhydrazino and phenylhydrazino; and
  • R¹¹ is selected from the group consisting of halogen, cyano, carboxylic acid, acyl, thioacyl, alkoxycarbonyl, acyloxy, carbonate, carbamate, C_1-7 alkyl, aryl, amino, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino, mercapto C_1-7 alkyl, C_1-7 alkyloxy;
  • R⁸ is selected from the group consisting of heteroaryl and aryl groups; halogen; C_1-7 alkyl; C_2-7 alkenyl; C_2-7 alkynyl; halo C_1-7 alkyl; carboxy C_1-7 alkyl; carboxyaryl; C_1-7 alkoxy; C_3-10 cycloalkoxy; aryloxy; arylalkyloxy; oxyheterocyclic; heterocyclic-substituted alkyloxy; thio C_1-7 alkyl; thio C_3-10 cycloalkyl; thioaryl; thioheterocyclic; arylalkylthio; heterocyclic-substituted alkylthio; hydroxylamino; acylamino; thio-acylamino; alkoxyamino; thioalkyl-amino; acetal; thio-acetal; carboxylic acid; carboxylic acid esters, thioesters, halides, anhydrides, amides and thioamides; thiocarboxylic acid; thiocarboxylic acid esters, thioesters, halides, anhydrides, amides and thioamides; hydroxyl; sulfhydryl; nitro; cyano; carbamoyl; thiocarbamoyl; ureido; thioureido; amino; alkylamino; cycloalkylamino; alkenylamino; cycloalkenylamino; alkynylamino; arylamino; arylalkylamino; hydroxyalkylamino; mercaptoalkylamino; heterocyclic amino; heterocyclic substituted arylamino; heterocyclic-substituted alkylamino; oximino; alkyloximino; hydrazino; alkylhydrazino; phenylhydrazino; esters, thioesters, halides, anhydrides, amides and thioamides thereof; aromatic or heterocyclic substituents substituted with an aliphatic spacer between the purine ring and the aromatic or heterocyclic substituent; wherein said heteroaryl or aryl groups are optionally substituted with one or more substituents selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino; and wherein said aliphatic spacer is a branched or straight, saturated or unsaturated aliphatic chain of 1 to 7 carbon atoms optionally containing one or more functions, atoms or radicals independently selected from the group consisting of halogen, carbonyl, thiocarbonyl, hydroxyl, thiol, ether, thio-ether, acetal, thio-acetal, amino, imino, oximino, alkyloximino, aminoacid, cyano, acylamino, thioacylamino, carbamoyl, thiocarbamoyl, ureido, thio-ureido, carboxylic acid ester or halide or anhydride or amide, thiocarboxylic acid or ester or thioester or halide or anhydride or amide, nitro, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, hydroxylamino, mercaptoamino, alkyl-amino, cycloalkylamino, alkenylamino, cycloalkenylamino, alkynylamino, arylamino, arylalkyl-amino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic-substituted alkylamino, hetero-cyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, sulfonyl, sulfinyl and sulfonamido;
  • R⁷ and R⁹ are selected from the group consisting of hydrogen, C_3-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, C_3-10 cycloalkyl, aryl, arylalkyl, alkylaryl, acyl sulfonyl and C_1-7 alkyl, wherein said C_1-7 alkyl is optionally containing one or more functions or radicals selected from the group consisting of halogen, carbonyl, thiocarbonyl, hydroxyl, sulfhydryl, C_1-7 alkoxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, acetal, thioacetal, imino, oximino, alkyloximino, amino-acid, cyano, (thio)carboxylic acid, (thio)carboxylic acid ester or amide, nitro, amino, C_1-7 alkylamino, cycloalkylamino, alkenylamino, cycloalkenyl-amino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercapto-alkylamino, heterocyclic-substituted alkylamino, heterocyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, sulfonyl and sulfonamido),

    
    
    

    wherein acyl group refers to a carbonyl group adjacent to a C_1-7 alkyl, a C_3-10 cycloalkyl, an aryl, an arylalkyl or a heterocyclic group, or is selected from the group comprising alkanoyl, cycloalkanoyl, cycloalkyl-alkanoyl, alkenoyl, alkylthioalkanoyl, alkanesulfonyl, alkoxycarbonyl, alkylcarbamoyl, alkylcarbamidoyl, alkoxalyl, aroyl, aralkanoyl, aralkenoyl, aryloxyalkanoyl, arylthioalkanoyl, arylaminoalkanoyl, aryloxycarbonyl, aralkoxycarbonyl, arylcarbamoyl, arylglyoxyloyl, arylthiocarbamoyl, arylcarbamidoyl, heterocyclic-carbonyl, heterocyclicalkanoyl, wherein said heterocyclic group is an aromatic or non-aromatic 5- to 7-membered heterocyclic ring with one or more heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur in said ring;

    
    
    

    and/or a pharmaceutical acceptable addition salt thereof and/or a stereoisomer thereof and/or a solvate thereof;

    
    
    

    as a medicine for the prevention or treatment of a viral infection in an animal, mammal or human.

The present invention also concerns the use of a compound having formula I, II, III or IV, for use as a medicine for the prevention or treatment of viral disorders, including a viral infection, in an animal, preferably a mammal, and more preferably a human. The present invention also concerns the use of a compound having formula I, II, III or IV for the manufacture of a medicament for the prevention or treatment of a viral infection in an animal, preferably a mammal, and more preferably a human.

In more specific embodiments of the invention, said viral infection is an infection with a virus from the family of the Retroviridae, the family of the Flaviviridae or the PicoRNAviridae. In a more particular embodiments of the invention, said viral infection is an infection with a virus of the genus Lentivirus, Hepacivirus, Flavivirus, or Enterovirus. In even more particular embodiments of the invention, said viral infection is an infection with a virus of the species HIV1, HIV2, HCV, Dengue virus, Poliovirus, Rhinovirus or Coxsackie virus.

The present invention also concerns a pharmaceutical composition comprising a therapeutically effective amount of a compound having formula I, II, III or IV, and one or more pharmaceutically acceptable exipients for use as a medicine for the prevention or treatment of a viral infection in an animal, mammal or human. Said composition may further comprise one or more biologically active drugs being selected from the group consisting of immunosuppressant and/or immunomodulator drugs, and/or antineoplastic drugs, and/or antiviral drugs.

The present invention also concerns a method of prevention or treatment of a viral disorder, including a viral infection, in an animal, comprising the administration of a therapeutically effective amount of a compound having formula I, II, III or IV, optionally in combination with one or more pharmaceutically acceptable excipients.

The present invention will now be further described. In the following passages, different aspects of the invention are defined in more detail. Each aspect so defined may be combined with any other aspect or aspects unless clearly indicated to the contrary. In particular, any feature indicated as being preferred or advantageous may be combined with any other feature or features indicated as being preferred or advantageous.

DETAILED DESCRIPTION OF THE INVENTION

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein, R³ and R² have any of the values as described herein and R¹ is selected from the extended group consisting of hydrogen, C_1-7 alkyl, amino, halogen, cyano, carboxylic acid, acyl, thioacyl, alkoxycarbonyl, acyloxy, carbonate, carbamate, aryl, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino, mercapto C_1-7 alkyl, and C_1-7 alkyloxy.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein, R³ and R² have any of the values as described herein and R¹ is selected from the group comprising aryl, amino, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino; preferably, said R¹ is selected from the group comprising amino, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) C_1-4 alkyl-arylamino; preferably, said R¹ is selected from the group comprising amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino; preferably, said R¹ is selected from the group comprising amino, and (mono- or di) C_1-7 alkylamino; more preferably R¹ is amino.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein, R⁶ and R⁵ have any of the values as described herein and R⁴ is selected from the extended group consisting of hydrogen, C_1-7 alkyl, amino, halogen, cyano, carboxylic acid, acyl, thioacyl, alkoxycarbonyl, acyloxy, carbonate, carbamate, aryl, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino, mercapto C_1-7 alkyl, and C_1-7 alkyloxy.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein, R³ and R¹ have any of the values as described herein and R² is selected from the extended group consisting of hydrogen, acylamino, heteroaryl and aryl groups; halogen; C_1-7 alkyl; C_2-7 alkenyl; C_2-7 alkynyl; halo C_1-7 alkyl; C_3-10 cycloalkyl; carboxy C_1-7 alkyl; carboxyaryl; C_1-7 alkoxy; C_3-10 cycloalkoxy; aryloxy; arylalkyloxy; oxyheterocyclic; heterocyclic-substituted alkyloxy; thio C_1-7 alkyl; thio C_3-10 cycloalkyl; thioaryl; thioheterocyclic; arylalkylthio; heterocyclic-substituted alkylthio; hydroxylamino; thio-acylamino; alkoxyamino; thioalkyl-amino; acetal; thio-acetal; carboxylic acid; carboxylic acid esters, thiocarboxylic acid; thiocarboxylic acid esters, thioesters, halides, anhydrides, amides and thioamides; hydroxyl; sulfhydryl; nitro; cyano; carbamoyl; thiocarbamoyl; ureido; thioureido; amino; alkylamino; cycloalkylamino; alkenylamino; cycloalkenylamino; alkynylamino; arylamino; arylalkylamino; hydroxyalkylamino; mercaptoalkylamino; heterocyclic amino; heterocyclic substituted arylamino; heterocyclic-substituted alkyl-amino; oximino; alkyloximino; hydrazino; alkylhydrazino; phenylhydrazino; esters, thioesters, halides, anhydrides, amides and thioamides thereof; aromatic or heterocyclic substituents substituted with an aliphatic spacer between the thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine ring and the aromatic or heterocyclic substituent, wherein said heteroaryl or aryl groups are optionally substituted with one or more substituents selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thioheterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino; wherein said aliphatic spacer is a branched or straight, saturated or unsaturated aliphatic chains of 1 to 7 carbon atoms optionally containing one or more functions, atoms or radicals independently selected from the group consisting of halogen, carbonyl, thiocarbonyl, hydroxyl, thiol, ether, thio-ether, acetal, thio-acetal, amino, imino, oximino, alkyloximino, aminoacid, cyano, acylamino, thioacylamino, carbamoyl, thiocarbamoyl, ureido, thio-ureido, carboxylic acid ester or halide or anhydride or amide, thiocarboxylic acid or ester or thioester or halide or anhydride or amide, nitro, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, hydroxylamino, mercaptoamino, alkyl-amino, cycloalkylamino, alkenylamino, cycloalkenylamino, alkynylamino, arylamino, arylalkyl-amino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic-substituted alkylamino, hetero-cyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, sulfonyl, sulfinyl and sulfonamido.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein, R⁶ and R⁴ have any of the values as described herein and R⁵ is selected from the extended group consisting of hydrogen, heteroaryl and aryl groups, wherein said heteroaryl or aryl groups are optionally substituted with one or more substituents selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, and heterocyclic amino.

In an embodiment, the present invention concern a compound of formula I, II, III or IV, a pharmaceutical acceptable addition salt thereof and/or a stereoisomer thereof and/or a solvate thereof, including the use of said compound according to the invention, wherein R¹, R⁴, and R¹¹ are each independently selected from the group consisting of amino, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein X is S. Another embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein X is O.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R¹ and R² have any of the values as described herein and R³ is selected from the group consisting of monoarylamino; diarylamino; (mono- or di-) arylC_1-4 alkylamino; morpholinyl; C_1-7 alkoxy, aralkylthio, piperidinyl, pyrrolidinyl, homopiperazinyl and piperazinyl, wherein said piperidinyl, pyrrolidinyl, homopiperazinyl or piperazinyl is optionally N-substituted with a substituent R²⁰, wherein R²⁰ has the same meaning as defined herein.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R⁴ and R⁵ have any of the values as described herein and R⁶ is selected from the group consisting of (mono- or di-) C_1-12 alkylamino, monoarylamino, diarylamino, (mono- or di-) C_3-10 cycloalkylamino, (mono- or di-) arylC_1-4 alkylamino, morpholinyl, C_1-7 alkoxy, homopiperazinyl and piperazinyl, wherein said homopiperazinyl or piperazinyl is optionally N-substituted with a substituent R²¹, wherein R²¹ has the same meaning as that defined in herein.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R¹¹, R⁷, R⁸ and R⁹ have any of the values as described herein and n is 0 and R¹⁰ is selected from the group consisting of formyl, acyl, thioacyl, amide, thioamide, sulfonyl, sulfinyl, carboxylate, thiocarboxylate, amino-substituted acyl, alkoxyalkyl, C_3-10 cycloalkyl-alkyl, C_3-10 cycloalkyl, dialkylaminoalkyl, heterocyclic-substituted alkyl, acyl-substituted alkyl, thioacyl-substituted alkyl, amido-substituted alkyl, thioamido-substituted alkyl, carboxylato-substituted alkyl, thiocarboxylato-substituted alkyl, (amino-substituted acyl)alkyl, heterocyclic, carboxylic acid ester, ω-carboxylic ester-alkyl, aryloxyalkyl, arylalkyl and aryl; wherein the aryl moiety of each of said aryloxyalkyl, arylalkyl and aryl radicals is optionally substituted with one or more substituents independently selected from the group consisting of halogen, C_1-7 alkyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, formyl, carbamoyl, thiocarbamoyl, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, cyano, alkylamino, cycloalkylamino.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R¹ and R³ have any of the values as described herein R² is selected from the group consisting of heteroaryl and aryl groups; C_1-7 alkyl; C_3-10 cycloalkyl; halo C_1-7 alkyl; carboxy C_1-7 alkyl; carboxyaryl; C_1-7 alkoxy; C_3-10 cycloalkoxy; aryloxy; arylalkyloxy; heterocyclic-substituted alkyloxy; thio C_1-7 alkyl; thio C_3-10 cycloalkyl; thioaryl; thioheterocyclic; arylalkylthio; heterocyclic-substituted alkylthio; hydroxylamino; acylamino; thio-acylamino; alkoxyamino; carbamoyl; thiocarbamoyl; aromatic or heterocyclic substituents substituted with an aliphatic spacer between the thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine ring and the aromatic or heterocyclic substituent, wherein said heteroaryl or aryl groups are optionally substituted with one or more substituents selected from the group consisting of halogen, C_1-7 alkyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, carbamoyl, thiocarbamoyl, sulfonamido, hydroxylamino, alkoxy-amino, acylamino, thioacylamino, cyano, wherein said aliphatic spacer is a branched or straight, saturated or unsaturated aliphatic chains of 1 to 7 carbon atoms optionally containing one or more functions, atoms or radicals independently selected from the group consisting of halogen, thiol, ether, thio-ether, amino, cyano, acylamino, nitro, thio C_1-7 alkyl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R⁴ and R⁶ have any of the values as described herein and R⁵ is an aryl group, wherein said aryl group is optionally substituted with one or more substituents selected from the group consisting of halogen, C_1-7 alkyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, C_1-7 alkoxy, thio C_1-7 alkyl, cyano.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R¹¹, R⁷, R¹² and R⁹ have any of the values as described herein, and R⁸ is selected from the group consisting of heteroaryl and aryl groups; C_1-7 alkyl; halo C_1-7 alkyl; C_1-7 alkoxy; C_3-10 cycloalkoxy; aryloxy; arylalkyloxy; thio C_1-7 alkyl; thio C_3-10 cycloalkyl; thioaryl; thioheterocyclic; arylalkylthio; heterocyclic-substituted alkylthio; aromatic or heterocyclic substituents substituted with an aliphatic spacer between the purine ring and the aromatic or heterocyclic substituent; wherein said heteroaryl or aryl groups are optionally substituted with one or more substituents selected from the group consisting of halogen, C_1-7 alkyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, thio C_1-7 alkyl, and wherein said aliphatic spacer is a branched or straight, saturated or unsaturated aliphatic chain of 1 to 7 carbon atoms optionally containing one or more functions, atoms or radicals independently selected from the group consisting of halogen, carbonyl, hydroxyl, thiol, cyano, nitro, thio C_1-7 alkyl, thio C_3-10 cycloalkyl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R³, R⁶ are each independently homopiperazinyl or piperazinyl, wherein said homopiperazinyl or piperazinyl is each respectively optionally N-substituted with a substituent R²⁰, R²¹, wherein R²⁰ and R²¹ have the same meaning as that defined herein.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R¹, R⁴ and R¹¹ are each independently amino.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R¹ and R³ have any of the values as described herein and R² is selected from the group consisting of phenyl; pyridin-3-yl; pyridin-2-yl; pyridin-4-yl; 4-fluorophenethyl; 4-fluorophenyl; 4-bromophenethyl; pentyl; tolyl; (4-fluorophenyl)butyl; (4-fluorophenyl)propyl; 4-chlorophenyl; 4-methylphenethyl; 3,4-dimethoxyphenethyl; 3-methoxyphenethyl; furan-2-yl; 2-phenylethyl; cyclohexyl; methoxylmethyl; cyclopropyl; 2-thiophen-2-ylethyl; cyclopentyl-(4-fluorophenyl)methyl; 1-(4-fluorophenyl)propyl; 4-fluorophenylamino; methylsulfinyl; 1-(4-chlorophenyl)ethyl; 3-methoxyphenyl; 4-chlorophenyl; 4-chlorophenylmethyl; N-oxopyridine-3-yl; 1-(4-chlorophenyl)cyclopropyl; 3,4-dichlorophenyl; methylthio; 1-phenylcyclopropyl; 1-(4-fluorophenyl)ethyl; 1-(4-fluorophenyl)-2-phenylethyl; 2-(4-fluorophenoxy)ethyl; morpholino; preferably 4-fluorophenyl, 4-fluorobenzyl, 4-fluorophenethyl, 2-(4-fluorophenoxy)ethyl, 1-(4-fluorophenyl)ethyl, 1-(4-fluorophenyl)-2-phenylethyl, 3-pyridyl, 3-methoxyphenyl, cyclopropyl, cyclohexyl, 3,4-dichlorophenyl, 1-phenylcyclopropyl, 1-(4-chlorophenyl)cyclopropyl, 2-thiophen-2-ylethyl, pentyl, and 2-phenylethyl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R⁴ and R⁶ have any of the values as described herein and R⁵ is phenyl or 4-fluorophenyl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R¹ and R² have any of the values as described herein and R³ is selected from the group consisting of p-tolyl piperazinyl-1-carboxylate; N-methyl-N-p-tolylpiperazinyl-1-carboxamide; N-p-tolylpiperazinyl-1-carbothioamide; —N-hexylpiperazinyl-1-carboxamide; 4-(N-4-fluorophenylcarboxamide)piperazin-1-yl; N-cyclohexylpiperazinyl-1-carboxamide; N-phenylpiperazinyl-1-carboxamide; N-(4-(trifluoromethyl)phenyl)piperazinyl-1-carboxamide, piperazin-1-yl-2-(4-chlorophenoxy)ethanone; piperazin-1-yl-2-(4-methoxyphenoxy)ethanone; benzylsulfonylpiperazin-1-yl; N-(4-cyanophenyl)piperazinyl-1-carboxamide; N-(4-methoxybenzyl)piperazinyl-1-carboxamide; N-(4-chlorophenyl)piperazinyl-1-carboxamide; N-m-tolylpiperazinyl-1-carboxamide; piperazin-1-yl-2-(m-tolyloxy)ethanone; piperazin-1-yl-2-(4-chlorophenoxy)-2-methylpropan-1-one; piperazin-1-yl-2-(4-trifluoromethoxyphenoxy)ethanone; piperazin-1-yl-2-(4-fluorophenoxy)ethanone; piperazin-1-yl-2-(4-bromophenoxy)ethanone; piperazin-1-yl-3-(4-fluorophenyl)propan-1-one; piperazin-1-yl-2-(3-chlorophenoxy)ethanone; 4-acetylphenoxy-piperazin-1-yl-ethanone; piperazin-1-yl-2-oxoethoxy)benzoate; piperazin-1-yl-2-(4-hydroxyphenoxy)ethanone; piperazin-1-yl-3-(4-bromophenyl)propan-1-one; N-(2-methoxyphenyl)piperazinyl-carboxamide; N-(4-bromophenyl)piperazinyl-carboxamide; N-(2,4-difluorophenyl)piperazinyl-carboxamide; piperazin-1-yl-2-(4-chloro-2-methylphenoxy)ethanone; piperazin-1-yl-2-(2,4-dichlorophenoxy)ethanone; (methylphenyl-carbamoyl)methyl]piperazin-1-yl; phenoxyethyl)piperazin-1-yl; (4-chlorophenyl)acetyl]-piperazin-1-yl; (4-chlorophenyl)acetyl]-piperazin-1-yl; [2-(3-nitrophenoxy)acetyl]-piperazin-1-yl; 4-(2-methoxyethyl)-piperazin-1-yl; 4-acetylpiperazin-1-yl; 4-isobutylpiperazin-1-yl; 3-chloro-4-fluorophenyl-amino; 4-(2-phenoxyethyl)piperazin-1-yl; 4-benzoylpiperidine-1-yl; 4-chlorophenoxyacetyl)pyrrolidin-3-(S)-ylamino; 1-tert-butoxycarbonylpyrrolidin-3-(S)-ylamino; 1-benzyloxycarbonylpiperidin-3-ylamino; 3-(R)-(4-chlorobenzoylamino)-pyrrolidin-1-yl; 3-(R)-[2-(4-chlorophenoxy)-acetylamino]pyrrolidin-1-yl; 3-(R)-tert-butoxycarbonylamino; 4-(phenethylcarbamoyl-methyl)piperazin-1-yl; 4-thiazol-2-yl-piperazine-1-yl; 4-[(methylphenylcarbamoyl)-methyl]piperazin-1-yl; 4-chlorophenoxy)acetyl]homopiperazin-1-yl; 4-phenylmethanesulfonylpiperazin-1-yl; 4-(3-phenylpropionyl)piperazin-1-yl; 4-[2-phenoxyacetyl]piperazin-1-yl; 4-[2-(4-chlorophenyl)acetyl]piperazin-1-yl; 4-[2-(3-nitrophenoxy)acetyl]piperazin-1-yl; 4-(phenylsulfonyl)piperazin-1-yl; pyrimidin-7-yl-piperazinyl-1-carboxylate; 4-benzylpiperazin-1-yl; piperazin-1-yl-1-morpholinoethanone; 4-pentylpiperazin-1-yl; 4-(thiazol-2-yl)piperazin-1-yl; 4-m-tolylpiperazin-1-yl; 3-methoxypropylamino; ethoxy; 2-methoxyethoxy; benzylthio; benzyl amino; preferably methylthio, piperazin-1-yl, ethoxy, morpholino, 4-m-tolylcarbamoyl-piperazin-1-yl, 4-(4-chlorophenoxyacetyl)piperazin-1-yl, 4-[2-(4-bromophenoxy)acetyl]-piperazin-1-yl, 4-[2-(3-nitrophenoxy)acetyl]-piperazin-1-yl, and 4-(2-phenoxyacetyl)-piperazin-1-yl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R² is selected from the group consisting of 4-fluorophenyl, 4-fluorobenzyl, 4-fluorophenethyl, 2-(4-fluorophenoxy)ethyl, 1-(4-fluorophenyl)ethyl, 1-(4-fluorophenyl)-2-phenylethyl, 3-pyridyl, 3-methoxyphenyl, cyclopropyl, cyclohexyl, 3,4-dichlorophenyl, 1-phenylcyclopropyl, 1-(4-chlorophenyl)cyclopropyl, 2-thiophen-2-ylethyl, pentyl, and 2-phenylethyl; R¹ and is amino; and R³ is selected from the group consisting of methylthio, piperazin-1-yl, ethoxy, morpholino, 4-m-tolylcarbamoyl-piperazin-1-yl, 4-(4-chlorophenoxyacetyl)piperazin-1-yl, 4-[2-(4-bromophenoxy)acetyl]-piperazin-1-yl, 4-[2-(3-nitrophenoxy)acetyl]-piperazin-1-yl, and 4-(2-phenoxyacetyl)-piperazin-1-yl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R⁴ and R⁶ have any of the values as described herein and R⁵ is phenyl or 4-fluorophenyl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R⁴ and R⁵ have any of the values as described herein and R⁶ is 4(m-tolylcarbamoyl)piperazin-1-yl or 4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R⁷, R⁸, R⁹, and R¹¹ have any of the values as described herein and R¹² is 4-(4-chlorophenoxy)acetylpiperazin-1-yl or 4-(phenoxyacetyl)piperazin-1-yl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R⁵ is phenyl or 4-fluorophenyl; R⁴ is amino; and R⁶ is (4(m-tolylcarbamoyl)piperazin-1-yl or (4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl).

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R⁷, R¹², R⁹, and R¹¹ have any of the values as described herein and R⁸ is 4-fluorophenyl or methylthio.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R¹², R⁸, and R¹¹ have any of the values as described herein R⁹ is hydrogen or methyl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R⁸, R¹², and R¹¹ have any of the values as described herein R⁷ is hydrogen or methyl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R¹¹ is amino, R¹² is 4-(4-chlorophenoxy)acetylpiperazin-1-yl or (4-phenoxyacetyl)piperazin-1-yl, R⁸ is 4-fluorophenyl or methylthio, and R⁹ is hydrogen or methyl.

One embodiment of the present invention concerns a compound according to the invention, including the use of said compound according to the invention, wherein R¹¹ is amino, R¹² is 4-(4-chlorophenoxy)acetylpiperazin-1-yl or 4-(phenoxyacetyl)piperazin-1-yl, R⁸ is 4-fluorophenyl or methylthio, and R⁷ is hydrogen or methyl.

In an embodiment, the present invention encompasses a thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine derivative having the general formula I, including the use according to the invention of said thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine derivative having the general formula I, wherein

• • X is S or O;
  • R¹ is selected from the group consisting of hydrogen, halogen, cyano, carboxylic acid, acyl, thioacyl, alkoxycarbonyl, acyloxy, carbonate, carbamate, C_1-7 alkyl, aryl, amino, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino, mercapto C_1-7 alkyl, C_1-7 alkyloxy;
  • R³ is selected from the group consisting of (mono- or di-) C_1-12 alkylamino; monoarylamino; diarylamino; (mono- or di-) C_3-10 cycloalkylamino; (mono- or di-) hydroxy C_1-7 alkylamino; (mono- or di-) C_1-4 alkylarylamino; (mono- or di-) arylC_1-4 alkylamino; morpholinyl; mercapto C_1-7 alkyl; C_1-7 alkoxy, homopiperazinyl and piperazinyl,

    • wherein said homopiperazinyl or piperazinyl is optionally N-substituted with a substituent R²⁰ selected from the group consisting of formyl, acyl, thioacyl, amide, thioamide, sulfonyl, sulfinyl, carboxylate, thiocarboxylate, amino-substituted acyl, alkoxyalkyl, C_3-10 cycloalkyl-alkyl, C_3-10 cycloalkyl, dialkylaminoalkyl, heterocyclic-substituted alkyl, acyl-substituted alkyl, thioacyl-substituted alkyl, amido-substituted alkyl, thioamido-substituted alkyl, carboxylato-substituted alkyl, thiocarboxylato-substituted alkyl, (amino-substituted acyl)alkyl, heterocyclic, carboxylic acid ester, ω-cyanoalkyl, ω-carboxylic ester-alkyl, halo C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, arylalkenyl, aryloxyalkyl, arylalkyl and aryl,

      • wherein the aryl moiety of each of said arylalkenyl, aryloxyalkyl, arylalkyl and aryl radicals is optionally substituted with one or more substituents independently selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thioheterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino, hydrazino, alkylhydrazino and phenylhydrazino; and

  • R² is selected from the group consisting of heteroaryl and aryl groups; hydrogen; halogen; C_1-7 alkyl; C_2-7 alkenyl; C_2-7 alkynyl; halo C_1-7 alkyl; carboxy C_1-7 alkyl; carboxyaryl; C_1-7 alkoxy; C_3-10 cycloalkoxy; aryloxy; arylalkyloxy; oxyheterocyclic; heterocyclic-substituted alkyloxy; thio C_1-7 alkyl; thio C_3-10 cycloalkyl; thioaryl; thioheterocyclic; arylalkylthio; heterocyclic-substituted alkylthio; hydroxylamino; acylamino; thio-acylamino; alkoxyamino; thioalkyl-amino; acetal; thio-acetal; carboxylic acid; carboxylic acid esters, thioesters, halides, anhydrides, amides and thioamides; thiocarboxylic acid; thiocarboxylic acid esters, thioesters, halides, anhydrides, amides and thioamides; hydroxyl; sulfhydryl; nitro; cyano; carbamoyl; thiocarbamoyl; ureido; thioureido; amino; alkylamino; cycloalkylamino; alkenylamino; cycloalkenylamino; alkynylamino; arylamino; arylalkylamino; hydroxyalkylamino; mercaptoalkylamino; heterocyclic amino; heterocyclic substituted arylamino; heterocyclic-substituted alkylamino; oximino; alkyloximino; hydrazino; alkylhydrazino; phenylhydrazino; esters, thioesters, halides, anhydrides, amides and thioamides thereof; aromatic or heterocyclic substituents substituted with an aliphatic spacer between the thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine ring and the aromatic or heterocyclic substituent,

    • wherein said heteroaryl or aryl groups are optionally substituted with one or more substituents selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino; and
    • wherein said aliphatic spacer is a branched or straight, saturated or unsaturated aliphatic chains of 1 to 7 carbon atoms optionally containing one or more functions, atoms or radicals independently selected from the group consisting of halogen, carbonyl, thiocarbonyl, hydroxyl, thiol, ether, thio-ether, acetal, thio-acetal, amino, imino, oximino, alkyloximino, aminoacid, cyano, acylamino, thioacylamino, carbamoyl, thiocarbamoyl, ureido, thio-ureido, carboxylic acid ester or halide or anhydride or amide, thiocarboxylic acid or ester or thioester or halide or anhydride or amide, nitro, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, hydroxylamino, mercaptoamino, alkyl-amino, cycloalkylamino, alkenylamino, cycloalkenylamino, alkynylamino, arylamino, arylalkyl-amino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic-substituted alkylamino, hetero-cyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, sulfonyl, sulfinyl and sulfonamido; and/or

      
      
      

      a pharmaceutical acceptable addition salt thereof and/or a stereoisomer thereof and/or a solvate thereof.

One embodiment of the present invention concerns thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, wherein R² and R³ have any of the values as described herein and R¹ is selected from the group consisting of amino, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino.

One embodiment of the present invention concerns thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, wherein R² and R¹ have any of the values as described herein and R³ is homopiperazinyl or piperazinyl.

One embodiment of the present invention concerns thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, wherein R¹ and R³ have any of the values as described herein and R² is selected from the group consisting of 4-fluorophenyl, 4-fluorobenzyl, 4-fluorophenethyl, 2-(4-fluorophenoxy)ethyl, 1-(4-fluorophenyl)ethyl, 1-(4-fluorophenyl)-2-phenylethyl, 3-pyridyl, 3-methoxyphenyl, cyclopropyl, cyclohexyl, 3,4-dichlorophenyl, 1-phenylcyclopropyl, 1-(4-chlorophenyl)cyclopropyl, 2-thiophen-2-ylethyl, pentyl, and 2-phenylethyl.

One embodiment of the present invention concerns thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, wherein R² and R³ have any of the values as described herein and R¹ is selected from the group consisting of amino, methyl, and hydrogen.

One embodiment of the present invention concerns thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, wherein R² and R¹ have any of the values as described herein and R³ is selected from the group consisting of methylthio, piperazin-1-yl, ethoxy, morpholino, 4-m-tolylcarbamoyl-piperazin-1-yl, 4-(4-chlorophenoxyacetyl)piperazin-1-yl, 4-[2-(4-bromophenoxy)acetyl]-piperazin-1-yl, 4-[2-(3-nitrophenoxy)acetyl]-piperazin-1-yl, and 4-(2-phenoxyacetyl)-piperazin-1-yl.

One embodiment of the present invention concerns thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, wherein R² is selected from the group consisting of 4-fluorophenyl, 4-fluorobenzyl, 4-fluorophenethyl, 2-(4-fluorophenoxy)ethyl, 1-(4-fluorophenyl)ethyl, 1-(4-fluorophenyl)-2-phenylethyl, 3-pyridyl, 3-methoxyphenyl, cyclopropyl, cyclohexyl, 3,4-dichlorophenyl, 1-phenylcyclopropyl, 1-(4-chlorophenyl)cyclopropyl, 2-thiophen-2-ylethyl, pentyl, and 2-phenylethyl; R⁵ is selected from the group consisting of amino, methyl, and hydrogen; and R⁷ is selected from the group consisting of methylthio, piperazin-1-yl, ethoxy, morpholino, 4-m-tolylcarbamoyl-piperazin-1-yl, 4-(4-chlorophenoxyacetyl)piperazin-1-yl, 4-[2-(4-bromophenoxy)acetyl]-piperazin-1-yl, 4-[2-(3-nitrophenoxy)acetyl]-piperazin-1-yl, and 4-(2-phenoxyacetyl)-piperazin-1-yl.

One embodiment of the present invention concerns thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, wherein X is S. One embodiment of the present invention concerns thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, wherein X is O.

One embodiment of the present invention concerns thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, being selected from the group consisting of: 2-(4-fluorophenyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-fluorobenzyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-fluorophenethyl)-7-methylthio-thiazolo[5,4-d]pyrimidin-5-amine; 2-(2-(4-fluorophenoxy)ethyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-fluorophenyl)-5-methyl-7-methylthio-thiazolo[5,4-d]pyrimidine; 2-(4-fluorophenyl)-7-(piperazin-1-yl)-thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-fluorobenzyl)-7-(piperazin-1-yl)-thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-fluorophenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine; 7-(benzylthio)-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-fluorophenyl)-7-(2-methoxyethoxy)-thiazolo[5,4-d]pyrimidin-5-amine; 7-ethoxy-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-5-amine; 7-ethoxy-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-fluorophenyl)-N-7-(3-methoxypropyl)thiazolo[5,4-d]pyrimidine-5,7-diamine; 2-(4-fluorophenyl)-7-morpholino-thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-fluorobenzyl)-7-morpholino-thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-fluorophenyl)-7-(4-m-tolylpiperazin-1-yl)-thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-fluorophenyl)-7-(4-(thiazol-2-yl)piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-fluorophenyl)-7-(4-pentylpiperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine; 2-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-1-morpholinoethanone; 7-(4-benzylpiperazin-1-yl)-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-5-amine; benzyl-4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazine-1-carboxylate; 2-(4-fluorophenyl)-7-(4-(phenylsulfonyl)piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine; 4-(5-amino-2-(4-fluorophenyl)-thiazolo[5,4-d]pyrimidin-7-yl)-N-p-tolylpiperazine-1-carboxamide; 4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide; 4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide; 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone; 1-(4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone; 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorophenyl)-5-methylthiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone; 1-(4-(5-amino-2-(2-(4-fluorophenoxy)ethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone; 1-(4-(5-amino-2-(4-fluorophenethyl)-thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone; 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone; 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-fluorophenoxy)ethanone; 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone; 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(m-tolyloxy)ethanone; 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(2,4-dichlorophenoxy)ethanone; 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-3-(4-fluorophenoxy)propan-1-one; 2-(1-(4-fluorophenyl)ethyl)-7-methylthio-thiazolo[5,4-d]pyrimidin-5-amine; 2-(1-(4-fluorophenyl)-2-phenylethyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine; 1-(4-(5-amino-2-(1-(4-fluorophenyl)ethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone; 1-(4-(5-amino-2-(1-(4-fluorophenyl)-2-phenylethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone; 4-(5-amino-2-(1-(4-fluorophenyl)ethyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide; 2-(4-fluorophenyl)-5,7-bis(methylthio)thiazolo[5,4-d]pyrimidine; 5,7-bis(butylthio)-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidine; 5,7-bis(benzylthio)-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidine; 7-ethoxy-2-(4-fluorophenyl)-5-(methylthio)thiazolo[5,4-d]pyrimidine; 5-amino-2-cyclopropyl-7-methylthiothiazolo[5,4-d]pyrimidine; 5-amino-2-(2-phenylethyl)-7-methylthiothiazolo[5,4-d]pyrimidine; 5-amino-2-cyclohexyl-7-methylthiothiazolo[5,4-d]pyrimidine; 5-amino-2-(3-pyridinyl)-7-methylthiothiazolo[5,4-d]pyrimidine; 5-amino-2-(4-chlorobenzyl)-7-methylthiothiazolo[5,4-d]pyrimidine; 5-amino-2-(3-methoxyphenyl)-7-methylthiothiazolo[5,4-d]pyrimidine; 5-amino-2-(4-chlorophenyl)-7-(methylthio)thiazolo[5,4-d]pyrimidine; 5-amino-2-cyclopropyl-7-methoxythiazolo[5,4-d]pyrimidine; 5-amino-2-cyclopropyl-7-N-piperazino-thiazolo[5,4-d]pyrimidine; 5-amino-2-(3,4-dichlorophenyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine; 5-amino-2-(1-phenylcyclopropyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine; 5-amino-2-(1-(4-chlorophenyl)cyclopropyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine; 5-amino-7-N-piperazino-2-methylthio-thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(1-phenylcyclopropyl)thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-methylthio-thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(3,4-dichlorophenyl)thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(1-(4-chlorophenyl)cyclopropyl)thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(2-phenylethyl)thiazolo[5,4-d]pyrimidine; 5-amino-2-cyclopropyl-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-cyclohexylthiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(pyridine-3-yl)thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(N-oxopyridine-3-yl)thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(4-chlorophenylmethyl)thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(4-chlorophenyl)thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(3-methoxyphenyl)thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(1-(4-chlorophenyl)ethyl)thiazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(4-fluorophenylamino)-thiazolo[5,4-d]pyrimidine; 5-amino-2-(4-fluorophenyl)-7-(4-[2-(4-bromophenoxy)acetyl]-piperazin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-(4-fluorophenyl)-7-(4-[2-(3-nitrophenoxy)acetyl]-piperazin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-(4-fluorophenyl)-7-(4-(2-phenoxyacetyl)-piperazin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(3-nitrophenoxy)acetyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(4-chlorophenyl)acetyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-m-tolylcarbamoylpiperazin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-phenoxyacetyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-[4-(4-chlorobenzoyl)piperazin-1-yl]-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-[4-(3-phenylpropionyl)piperazin-1-yl]-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-[4-phenylmethanesulfonylpiperazin-1-yl]-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(4-chlorophenoxy)acetyl]homopiperazin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[(methylphenylcarbamoyl)-methyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-thiazol-2-yl-piperazine-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-(phenethylcarbamoyl-methyl)piperazin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-((3-(R)-tert-butoxycarbonylamino)pyrrolidin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(3-(R)-[2-(4-chlorophenoxy)-acetylamino]pyrrolidin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(3-(R)-(4-chlorobenzoylamino)-pyrrolidin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(1-benzyloxycarbonylpiperidin-3-ylamino)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(1-tert-butoxycarbonylpyrrolidin-3-(S)-ylamino)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(1-(4-chlorophenoxyacetyl)pyrrolidin-3-(S)-ylamino)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-benzoylpiperidine-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-(2-phenoxyethyl)piperazin-1-yl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-[1-(4-fluorophenyl)propyl]-7-(4-[2-(4-chlorophenoxy)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine; 5-amino-2-[cyclopentyl-(4-fluorophenyl)methyl]-7-(4-[2-(4-chlorophenoxy)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine; 5-amine-7-piperazin-1-yl-2-(2-thiophen-2-yl-ethyl)-thiazolo[5,4-d]pyrimidine; 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-[2-(4-chloro-phenoxy)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine; 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-[2-(4-chloro-phenyl)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine; 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-(4-chloro-benzoyl)piperazin-1-yl)thiazolo[5,4-d]pyrimidine; 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-m-tolylcarbamoylpiperazin-1-yl)thiazolo[5,4-d]pyrimidine; 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorophenyl)oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone; 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorophenyl)-5-methyl-oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone; 1-(4-(5-amino-2-(4-fluorophenyl)oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone; 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorobenzyl)oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone; 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorobenzyl)-5-methyloxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone; 1-(4-(5-amino-2-(4-fluorophenethyl)oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone; N-(3-chloro-4-fluorophenyl)-2-(4-fluorophenyl)-oxazolo[5,4-d]pyrimidin-7-amine; N-7-(3-chloro-4-fluorophenyl)-2-(4-fluorophenyl)-oxazolo[5,4-d]pyrimidine-5,7-diamine; 5-amino-2-cyclopropyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine; 5-amino-2-methoxymethyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine; 5-amino-2-cyclohexyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine; 5-amino-2-pentyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine; 5-amino-2-(2-phenylethyl)-7-N-piperazino-oxazolo[5,4-d]pyrimidine; 5-amino-2-cyclopropyl-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-oxazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-methoxylmethyloxazolo[5,4-d]pyrimidine; 5-amino-2-cyclohexyl-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]oxazolo[5,4-d]pyrimidine; 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-pentyloxazolo[5,4-d]pyrimidine; 5-amino-2-(2-phenylethyl)-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]oxazolo[5,4-d]pyrimidine; 5-amino-2-(4-fluorophenyl)-7-(4-isobutylpiperazin-1-yl)-oxazolo[5,4-d]pyrimidine; 5-amino-2-(4-fluorophenyl)-7-(4-acetylpiperazin-1-yl)-oxazolo[5,4-d]pyrimidine; 5-amino-2-(4-fluorophenyl)-7-[4-(2-methoxyethyl)-piperazin-1-yl]-oxazolo[5,4-d]pyrimidine; 5-amino-2-(4-fluorophenyl)-7-(4-[2-(3-nitrophenoxy)acetyl]-piperazin-1-yl)-oxazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(4-chlorophenyl)acetyl]-piperazin-1-yl)-oxazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[4-chlorobenzoyl]piperazin-1-yl)-oxazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-m-tolylcarbamoylpiperazin-1-yl)-oxazolo[5,4-d]pyrimidine; 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-(2-phenoxyethyl)piperazin-1-yl)-oxazolo[5,4-d]pyrimidine; and 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[(methylphenyl-carbamoyl)methyl]piperazin-1-yl)-oxazolo[5,4-d]pyrimidine.

The present invention also concerns thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, for use as a medicine for the prevention or treatment of viral disorders, including viral infections in an animal. In an embodiment, said animal is a mammal. In an embodiment, said mammal is a human being.

The present invention also concerns the use of the thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, for the manufacture of a medicament for the prevention or treatment of a viral disorder including viral infections in an animal, preferably a mammal, and more preferably a human. In more specific embodiments, said viral infection is an infection with a virus from the family of the Retroviridae, the family of the Flaviviridae or the PicoRNAviridae. In more particular embodiments, said viral infection is an infection with a virus of the genus Lentivirus, Hepacivirus, Flavivirus, or Enterovirus. In even more particular embodiments, said viral infection is an infection with a virus of the species HIV1, HIV2, HCV, Dengue virus, Poliovirus, Rhinovirus or Coxsackie virus.

The present invention also concerns a pharmaceutical composition comprising a therapeutically effective amount of a thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine of formula I, any subgroup thereof, or stereoisomeric forms thereof, and one or more pharmaceutically acceptable exipients for use as a medicine for the prevention or treatment of a viral infection in an animal, a mammal or a human. In an embodiment, said pharmaceutical composition further comprises one or more biologically active drugs being selected from the group consisting of immunosuppressant and/or immunomodulator drugs, and/or antineoplastic drugs, and/or antiviral drugs.

The present invention also concerns a method of prevention or treatment of a viral disorder, including a viral infection, in an animal, comprising the administration of a therapeutically effective amount of a thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine derivative or formula I, optionally in combination with one or more pharmaceutically acceptable excipients. In an embodiment, said viral infection is an infection with a virus from the family of the Retroviridae, the family of the Flaviviridae or the PicoRNAviridae. In a more particular embodiment, said viral infection is an infection with a virus of the genus Lentivirus, Hepacivirus, Flavivirus, or Enterovirus. In an even more particular embodiment, said viral infection is an infection with a virus of the species HIV1, HIV2, HCV, Dengue virus, Poliovirus, Rhinovirus or Coxsackie virus. In an embodiment, said animal is a mammal, preferably said mammal is a human being.

In an embodiment, the present invention encompasses a thieno(2,3-d)pyrimidine derivative having the general formula II, including the use according to the invention of said thieno(2,3-d)pyrimidine derivative having the general formula II,

wherein

• • R⁴ is selected from the group consisting of halogen, cyano, carboxylic acid, acyl, thioacyl, alkoxycarbonyl, acyloxy, carbonate, carbamate, C_1-7 alkyl, aryl, amino, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino, mercapto C_1-7 alkyl, C_1-7 alkyloxy;
  • R⁶ is selected from the group consisting of (mono- or di-) C_1-12 alkylamino, monoarylamino, diarylamino, (mono- or di-) C_3-10 cycloalkylamino, (mono- or di-) hydroxy C_1-7 alkylamino, (mono- or di-) C_1-4 alkylarylamino, (mono- or di-) arylC_1-4 alkylamino, morpholinyl, mercapto C_1-7 alkyl, C_1-7 alkoxy, homopiperazinyl and piperazinyl,

    • wherein said homopiperazinyl or piperazinyl is optionally N-substituted with a substituent R²¹ selected from the group consisting of formyl, acyl, thioacyl, amide, thioamide, sulfonyl, sulfinyl, carboxylate, thiocarboxylate, amino-substituted acyl, alkoxyalkyl, C_3-10 cycloalkyl-alkyl, C_3-10 cycloalkyl, dialkylaminoalkyl, heterocyclic-substituted alkyl, acyl-substituted alkyl, thioacyl-substituted alkyl, amido-substituted alkyl, thioamido-substituted alkyl, carboxylato-substituted alkyl, thiocarboxylato-substituted alkyl, (amino-substituted acyl)alkyl, heterocyclic, carboxylic acid ester, ω-cyanoalkyl, ω-carboxylic ester-alkyl, halo C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, arylalkenyl, aryloxyalkyl, arylalkyl and aryl,

      • wherein the aryl moiety of each of said arylalkenyl, aryloxyalkyl, arylalkyl and aryl radicals is optionally substituted with one or more substituents independently selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino, hydrazino, alkylhydrazino and phenylhydrazino; and

  • R⁵ is selected from the group consisting of heteroaryl and aryl groups, wherein said heteroaryl or aryl groups are optionally substituted with one or more substituents selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino, or a pharmaceutical acceptable addition salt thereof, or a stereoisomer thereof, or a solvate thereof.

One embodiment of the present invention concerns thieno(2,3-d)pyrimidine derivative of formula II, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thieno(2,3-d)pyrimidine derivative having the general formula II, any subgroup thereof, or stereoisomeric forms thereof, wherein R⁵ and R⁶ have any of the values as described herein, and wherein R⁴ is selected from the group consisting of amino, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino.

One embodiment of the present invention concerns thieno(2,3-d)pyrimidine derivative of formula II, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thieno(2,3-d)pyrimidine derivative, having the general formula II, any subgroup thereof, or stereoisomeric forms thereof, wherein R⁴ and R⁵ have any of the values as described herein and wherein R⁶ is homopiperazinyl or piperazinyl.

One embodiment of the present invention concerns thieno(2,3-d)pyrimidine derivative of formula II, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thieno(2,3-d)pyrimidine derivative, having the general formula II, any subgroup thereof, or stereoisomeric forms thereof, wherein R⁴ and R⁶ have any of the values as described herein and wherein R⁵ is phenyl or 4-fluorophenyl.

One embodiment of the present invention concerns thieno(2,3-d)pyrimidine derivative of formula II, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thieno(2,3-d)pyrimidine derivative, having the general formula II, any subgroup thereof, or stereoisomeric forms thereof, wherein R⁵ and R⁶ have any of the values as described herein and wherein R⁴ is butyl, methyl, or amino.

One embodiment of the present invention concerns thieno(2,3-d)pyrimidine derivative of formula II, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thieno(2,3-d)pyrimidine derivative, having the general formula II, any subgroup thereof, or stereoisomeric forms thereof, wherein R⁴ and R⁵ have any of the values as described herein and wherein R⁶ is 4(m-tolylcarbamoyl)piperazin-1-yl or 4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl.

One embodiment of the present invention concerns thieno(2,3-d)pyrimidine derivative of formula II, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thieno(2,3-d)pyrimidine derivative, having the general formula II, any subgroup thereof, or stereoisomeric forms thereof, wherein R⁵ is phenyl or 4-fluorophenyl; R⁴ is butyl, methyl, or amino; and R⁶ is (4(m-tolylcarbamoyl)piperazin-1-yl or (4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl).

One embodiment of the present invention concerns thieno(2,3-d)pyrimidine derivative of formula II, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said thieno(2,3-d)pyrimidine derivative, having the general formula II, any subgroup thereof, or stereoisomeric forms thereof, being selected from the group consisting of: 1-(4-(2-butyl-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone; 2-butyl-N-(3-chloro-4-fluorophenyl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-amine; 2-(4-chlorophenoxy)-1-(4-(6-(4-fluorophenyl)-2-methylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)ethanone; 1-(4-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone; 2-amino-4-N-benzylamino-6-(4-fluorophenyl)-thieno[2,3-d]pyrimidine; 2-amino-4-N-piperazinyl-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-(4-m-tolylcarbamoylpiperazin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-(4-m-tolylcarbamoylpiperazin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-(4-p-chlorophenylcarbamoylpiperazin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-4-[2-phenoxy)acetyl]piperazin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-N-homopiperazinyl-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-(4-[2-(4-chlorophenoxy)acetyl]homopiperazin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-(4-[4-chlorobenzoyl]homopiperazin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-(4-[(methylphenyl-carbamoyl)methyl]piperazin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-(4-(2-phenoxyethyl)piperazin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-(3-(R)-tert-butoxycarbonylamino)pyrrolidin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-(3-(R)-amino)pyrrolidin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-(3-(R)-[2-(4-chlorophenoxy)-acetylamino]pyrrolidin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-(3-(R)-(4-chlorobenzoylamino)-pyrrolidin-1-yl)-6-phenyl-thieno[2,3-d]pyrimidine; 2-amino-4-N-piperazinyl-6-(4-fluorophenyl)-thieno[2,3-d]pyrimidine; 2-amino-4-[N-(hydrocinnamoyl)-piperazin-1-yl]-6-(4-fluorophenyl)-thieno[2,3-d]pyrimidine; 2-amino-4-[4-phenylmethanesulfonylpiperazin-1-yl]-6-(4-fluorophenyl)-thieno[2,3-d]pyrimidine; 2-amino-4-[N-(cyclohexanoyl)-piperazinyl]-6-(4-fluorophenyl)-thieno[2,3-d]pyrimidine; 2-amino-4-[N-(isonicotinoyl)-piperazinyl]-6-(4-fluorophenyl)-thieno[2,3-d]pyrimidine; 2-amino-4-[N-(diisopropylcarbamoyl)-piperazinyl-6-(4-fluorophenyl)-thieno[2,3-d]pyrimidine; 2-amino-4-(4-benzoylpiperidine-1-yl)-6-(4-fluorophenyl)-thieno[2,3-d]pyrimidine; 2-amino-4-N-piperazino-thieno[2,3-d]pyrimidine; 2-amino-4-(4-[2-(4-chlorophenoxy)acetyl]piperazin-1-yl)-thieno[2,3-d]pyrimidin-4-(3H)-one; 2-(4-chlorophenoxy)-1-(4-(6-(4-fluorophenyl)-2-phenylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)ethanone; 4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidine-2-carboxylate; ethyl 2-(4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-2-yl)acetate; 4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidine-2-carboxamide; 4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)-N-(2-methoxyethyl)thieno[2,3-d]pyrimidine-2-carboxamide; 4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidine-2-carboxylic acid; 2-(4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-2-yl)acetamide; 4-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)-N-m-tolylpiperazine-1-carboxamide; 4-(6-(4-fluorophenyl)-2-phenylthieno[2,3-d]pyrimidin-4-yl)-N-m-tolylpiperazine-1-carboxamide; ethyl 6-(4-fluorophenyl)-4-(4-(m-tolylcarbamoyl)piperazin-1-yl)thieno[2,3-d]pyrimidine-2-carboxylate; 6-(4-fluorophenyl)-4-(4-(m-tolylcarbamoyl)piperazin-1-yl)thieno[2,3-d]pyrimidine-2-carboxamide; 4-ethoxy-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-2-amine; 6-(4-fluorophenyl)-4-morpholinothieno[2,3-d]pyrimidin-2-amine; N-(3-chloro-4-fluorophenyl)-6-(4-fluorophenyl)-2-methylthieno[2,3-d]pyrimidin-4-amine; and 4-(3-chloro-4-fluorophenylamino)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidine-2-carboxylate.

The present invention also concerns thieno(2,3-d)pyrimidine derivative of formula II, any subgroup thereof, or stereoisomeric forms thereof, for use as a medicine for the prevention or treatment of viral disorders, including viral infections in an animal. In an embodiment, said animal is a mammal. In an embodiment, said mammal is a human being.

The present invention also concerns the use of the thieno(2,3-d)pyrimidine derivative of formula II, any subgroup thereof, or stereoisomeric forms thereof, for the manufacture of a medicament for the prevention or treatment of a viral disorder, including viral infections, in an animal, preferably a mammal, and more preferably a human. In more specific embodiments, said viral infection is an infection with a virus from the family of the Retroviridae, the family of the Flaviviridae or the PicoRNAviridae. In more particular embodiments, said viral infection is an infection with a virus of the genus Lentivirus, Hepacivirus, Flavivirus, or Enterovirus. In even more particular embodiments, said viral infection is an infection with a virus of the species HIV1, HIV2, HCV, Dengue virus, Poliovirus, Rhinovirus or Coxsackie virus.

The present invention also concerns a pharmaceutical composition comprising a therapeutically effective amount of a thieno(2,3-d)pyrimidine derivative of formula II, any subgroup thereof, or stereoisomeric forms thereof, and one or more pharmaceutically acceptable exipients for use as a medicine for the prevention or treatment of a viral infection in an animal, a mammal or a human. In an embodiment, said pharmaceutical composition further comprises one or more biologically active drugs being selected from the group consisting of immunosuppressant and/or immunomodulator drugs, and/or antineoplastic drugs, and/or antiviral drugs.

The present invention also concerns a method of prevention or treatment of a viral disorder, including a viral infection, in an animal, comprising the administration of a therapeutically effective amount of a thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine derivative or formula I, optionally in combination with one or more pharmaceutically acceptable excipients.

In an embodiment, said viral infection is an infection with a virus from the family of the Retroviridae, the family of the Flaviviridae or the PicoRNAviridae. In a more particular embodiment, said viral infection is an infection with a virus of the genus Lentivirus, Hepacivirus, Flavivirus, or Enterovirus. In an even more particular embodiment, said viral infection is an infection with a virus of the species HIV1, HIV2, HCV, Dengue virus, Poliovirus, Rhinovirus or Coxsackie virus. In an embodiment, said animal is a mammal, preferably said mammal is a human being.

In an embodiment, the present invention encompasses a purine derivative having the general formula III or IV, including the use according to the invention of said purine derivative having the general formula III or IV,

wherein substituent R¹² is represented by the general formula V:

and wherein

schematically represents a saturated or partly unsaturated heterocyclic ring with at least two nitrogen atoms in the said heterocyclic ring and with a total of 5 to 7 atoms in the said heterocyclic ring, and optionally with one or more other heteroatoms in the said heterocyclic ring or attached to one or more carbon atoms of said heterocyclic ring (for instance in the form of a carbonyl or thiocarbonyl group), wherein one of said at least two nitrogen atoms in the heterocyclic ring is attached to a carbon atom 6 of the purine ring;

• • each substituent R¹³ of the heterocyclic ring is a group independently selected from the group consisting of halogen, nitro, C_1-7 alkyl (optionally containing one or more functions or radicals selected from the group consisting of halogen, carbonyl, thiocarbonyl, hydroxyl, sulfhydryl, C_1-7 alkoxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, acetal, thioacetal, imino, oximino, alkyloximino, amino-acid, cyano, (thio)carboxylic acid, (thio)carboxylic acid ester or amide, nitro, amino, C_1-7 alkylamino, cycloalkylamino, alkenylamino, cycloalkenyl-amino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercapto-alkylamino, heterocyclic-substituted alkylamino, heterocyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, sulfonyl and sulfonamido), C_3-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, C_3-10 cycloalkyl, aryl, arylalkyl, alkylaryl, alkylacyl, arylacyl, hydroxyl, sulfhydryl, amino, C_1-7 alkylamino, cycloalkylamino, alkenylamino, cycloalkenylamino, alkynylamino, arylamino, arylalkyl-amino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic-substituted alkylamino, heterocyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thioheterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, hydroxylamino, cyano, (thio)carboxylic acid or esters or thioesters or amides or thioamides thereof;
  • n is an integer from 0 to 6;
  • R¹⁰ is selected from the group consisting of formyl, acyl, thioacyl, amide, thioamide, sulfonyl, sulfinyl, carboxylate, thiocarboxylate, amino-substituted acyl, alkoxyalkyl, C_3-10 cycloalkyl-alkyl, C_3-10 cycloalkyl, dialkylaminoalkyl, heterocyclic-substituted alkyl, acyl-substituted alkyl, thioacyl-substituted alkyl, amido-substituted alkyl, thioamido-substituted alkyl, carboxylato-substituted alkyl, thiocarboxylato-substituted alkyl, (amino-substituted acyl)alkyl, heterocyclic, carboxylic acid ester, w-cyanoalkyl, w-carboxylic ester-alkyl, halo C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, arylalkenyl, aryloxyalkyl, arylalkyl and aryl,

    • wherein the aryl moiety of each of said arylalkenyl, aryloxyalkyl, arylalkyl and aryl radicals is optionally substituted with one or more substituents independently selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino, hydrazino, alkylhydrazino and phenylhydrazino; and

  • R¹¹ is selected from the group consisting of halogen, cyano, carboxylic acid, acyl, thioacyl, alkoxycarbonyl, acyloxy, carbonate, carbamate, C_1-7 alkyl, aryl, amino, acetamido, N-protected amino, (mono- or di) C_1-7 alkylamino, (mono- or di) arylamino, (mono- or di) C_3-10 cycloalkylamino, (mono- or di) hydroxy C_1-7 alkylamino, (mono- or di) C_1-4 alkyl-arylamino, mercapto C_1-7 alkyl, C_1-7 alkyloxy;
  • R⁸ is selected from the group consisting of heteroaryl and aryl groups; halogen; C_1-7 alkyl; C_2-7 alkenyl; C_2-7 alkynyl; halo C_1-7 alkyl; carboxy C_1-7 alkyl; carboxyaryl; C_1-7 alkoxy; C_3-10 cycloalkoxy; aryloxy; arylalkyloxy; oxyheterocyclic; heterocyclic-substituted alkyloxy; thio C_1-7 alkyl; thio C_3-10 cycloalkyl; thioaryl; thioheterocyclic; arylalkylthio; heterocyclic-substituted alkylthio; hydroxylamino; acylamino; thio-acylamino; alkoxyamino; thioalkyl-amino; acetal; thio-acetal; carboxylic acid; carboxylic acid esters, thioesters, halides, anhydrides, amides and thioamides; thiocarboxylic acid; thiocarboxylic acid esters, thioesters, halides, anhydrides, amides and thioamides; hydroxyl; sulfhydryl; nitro; cyano; carbamoyl; thiocarbamoyl; ureido; thioureido; amino; alkylamino; cycloalkylamino; alkenylamino; cyclo-alkenylamino; alkynylamino; arylamino; arylalkylamino; hydroxyalkylamino; mercaptoalkyl-amino; heterocyclic amino; heterocyclic substituted arylamino; heterocyclic-substituted alkyl-amino; oximino; alkyloximino; hydrazino; alkylhydrazino; phenylhydrazino; esters, thioesters, halides, anhydrides, amides and thioamides thereof; aromatic or heterocyclic substituents substituted with an aliphatic spacer between the purine ring and the aromatic or heterocyclic substituent,

    • wherein said heteroaryl or aryl groups are optionally substituted with one or more substituents selected from the group consisting of halogen, C_1-7 alkyl, C_2-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, nitro, hydroxyl, sulfhydryl, amino, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thio-heterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, carbamoyl, thiocarbamoyl, ureido, thioureido, sulfonamido, hydroxylamino, alkoxy-amino, mercaptoamino, thioalkylamino, acylamino, thioacylamino, cyano, carboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, thiocarboxylic acid or esters or thioesters or halides or anhydrides or amides thereof, alkylamino, cycloalkylamino, alkenylamino, cyclo-alkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic amino; and
    • wherein said aliphatic spacer is a branched or straight, saturated or unsaturated aliphatic chain of 1 to 7 carbon atoms optionally containing one or more functions, atoms or radicals independently selected from the group consisting of halogen, carbonyl, thiocarbonyl, hydroxyl, thiol, ether, thio-ether, acetal, thio-acetal, amino, imino, oximino, alkyloximino, aminoacid, cyano, acylamino, thioacylamino, carbamoyl, thiocarbamoyl, ureido, thio-ureido, carboxylic acid ester or halide or anhydride or amide, thiocarboxylic acid or ester or thioester or halide or anhydride or amide, nitro, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, hydroxylamino, mercaptoamino, alkyl-amino, cycloalkylamino, alkenylamino, cycloalkenylamino, alkynylamino, arylamino, arylalkyl-amino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic-substituted alkylamino, hetero-cyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, sulfonyl, sulfinyl and sulfonamido;

  • R⁷ and R⁹ are selected from the group consisting of hydrogen, C_1-7 alkyl (optionally containing one or more functions or radicals selected from the group consisting of halogen, carbonyl, thiocarbonyl, hydroxyl, sulfhydryl, C_1-7 alkoxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, acetal, thioacetal, imino, oximino, alkyloximino, amino-acid, cyano, (thio)carboxylic acid, (thio)carboxylic acid ester or amide, nitro, amino, C_1-7 alkylamino, cycloalkylamino, alkenylamino, cycloalkenyl-amino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercapto-alkylamino, heterocyclic-substituted alkylamino, heterocyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, sulfonyl and sulfonamido), C_3-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, C_3-10 cycloalkyl, aryl, arylalkyl, alkylaryl, acyl and sulfonyl;

    
    
    

    or a pharmaceutical acceptable addition salt thereof, or a stereoisomer thereof, or a solvate thereof.

One embodiment of the present invention concerns a purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, wherein R⁷, R⁸, R⁹, R¹² have any of the values as described herein and wherein R¹¹ is amino.

One embodiment of the present invention concerns a purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, wherein R⁷, R⁸, R⁹, R¹¹ have any of the values as described herein and wherein R¹² is 4-(4-chlorophenoxy)acetylpiperazin-1-yl or 4-(phenoxyacetyl)piperazin-1-yl.

One embodiment of the present invention concerns a purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, wherein R⁷, R¹¹, R⁹, R¹² have any of the values as described herein and wherein R⁸ is 4-fluorophenyl or methylthio.

One embodiment of the present invention concerns a purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, wherein R⁷, R⁸, R¹¹, R¹² have any of the values as described herein and wherein R⁹ is hydrogen or methyl.

One embodiment of the present invention concerns a purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, wherein R¹¹, R⁸, R⁹, R¹² have any of the values as described herein and wherein R⁷ is hydrogen or methyl.

One embodiment of the present invention concerns a purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, wherein R¹¹ is amino, R¹² is 4-(4-chlorophenoxy)acetylpiperazin-1-yl or (4-phenoxyacetyl)piperazin-1-yl, R⁸ is 4-fluorophenyl or methylthio, and R⁹ is hydrogen or methyl.

One embodiment of the present invention concerns a purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, wherein R¹¹ is amino, R¹² is 4-(4-chlorophenoxy)acetylpiperazin-1-yl or 4-(phenoxyacetyl)piperazin-1-yl, R⁸ is 4-fluorophenyl or methylthio, and R⁷ is hydrogen or methyl.

One embodiment of the present invention concerns a purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, including the use according to the invention of said purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, being selected from the group consisting of: 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(3,4-dimethoxyphenyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(4-bromophenyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(4-chlorophenyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(3-chlorophenyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(4-trifluoromethylphenyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(4-trifluoromethoxyphenyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(4-methylphenyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-propyl-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(cyclopropyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(t-butyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-methyl-9H-purine; 2-amino-6-[4-(phenoxyacetyl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(3-methoxy-benzoyl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(2-thiophene-acetyl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(4-chloro-benzoyl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[(4-α-toluenesulfonyl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(1-naphthoyl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-acetylpiperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(thiazol-2-yl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-1-(pyrrolidin-1-yl)ethanone; 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-1-morpholino-ethanone; 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-N-(pyridin-3-yl)acetamide; 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-N-methyl-N-phenylacetamide; 2-amino-6-[4-(4-chlorophenyl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(4-fluorophenyl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-N-(pyridin-2-yl)acetamide; 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-N-(thiazol-2-yl)acetamide; 2-amino-6-[4-(4-fluorobenzyl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(4-pyridinyl)piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-(homopiperazin-1-yl)-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)homopiperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(N-3-tolylcarbamoyl)-homopiperazin-1-yl]-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-methylthio-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-propylthio-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-benzylthio-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(2-phenylethylthio)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-9-methyl-8-methylthio-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(cyclopentylthio)-9H-purine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(4-fluorophenyl)-9-methylpurine; 2-amino-6-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-8-(4-fluorophenyl)-9-benzylpurine; 2-amino-6-(piperazin-1-yl)-8-(4-fluorophenyl)-9H-purine; 2-amino-6-[4-(hydrocinnamoyl)-piperazin-1-yl]-8-(4-fluorophenyl)-9H-purine.

The present invention also concerns purine derivatives of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, for use as a medicine for the prevention or treatment of viral disorders, including viral infections in an animal. In an embodiment, said animal is a mammal. In an embodiment, said mammal is a human being.

The present invention also concerns the use of a purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, for the manufacture of a medicament for the prevention or treatment of a viral disorders including viral infections in an animal, preferably a mammal, and more preferably a human. In more specific embodiments, said viral infection is an infection with a virus from the family of the Retroviridae, the family of the Flaviviridae or the PicoRNAviridae. In more particular embodiments, said viral infection is an infection with a virus of the genus Lentivirus, Hepacivirus, Flavivirus, or Enterovirus. In even more particular embodiments, said viral infection is an infection with a virus of the species HIV1, HIV2, HCV, Dengue virus, Poliovirus, Rhinovirus or Coxsackie virus.

The present invention also concerns a pharmaceutical composition comprising a therapeutically effective amount of a purine derivative of formula III or IV, any subgroup thereof, or stereoisomeric forms thereof, and one or more pharmaceutically acceptable exipients for use as a medicine for the prevention or treatment of a viral infection in an animal, mammal or human. In an embodiment, said pharmaceutical composition further comprises one or more biologically active drugs being selected from the group consisting of immunosuppressant and/or immunomodulator drugs, and/or antineoplastic drugs, and/or antiviral drugs.

The present invention also concerns a method of prevention or treatment of a viral disorder, including a viral infection, in an animal, comprising the administration of a therapeutically effective amount of a thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine derivative or formula I, optionally in combination with one or more pharmaceutically acceptable excipients.

In an embodiment, said viral infection is an infection with a virus from the family of the Retroviridae, the family of the Flaviviridae or the PicoRNAviridae. In a more particular embodiment, said viral infection is an infection with a virus of the genus Lentivirus, Hepacivirus, Flavivirus, or Enterovirus. In an even more particular embodiment, said viral infection is an infection with a virus of the species HIV1, HIV2, HCV, Dengue virus, Poliovirus, Rhinovirus or Coxsackie virus. In an embodiment, said animal is a mammal, preferably said mammal is a human being.

In a particular embodiment, the present invention also relates to the thiazolo(5,4-d)pyrimidine, oxazolo(5,4-d)pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of formula I, II, III or IV, including the use according to the invention of said thiazolo(5,4-d)pyrimidine, oxazolo(5,4-d)pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of formula I, II, III or IV, being selected from the group consisting of:

• 2-(4-fluorophenyl)-7-(piperazin-1-yl)-thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-fluorobenzyl)-7-(piperazin-1-yl)-thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-fluorophenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-fluorophenyl)-7-(2-methoxyethoxy)-thiazolo[5,4-d]pyrimidin-5-amine
• 7-ethoxy-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-5-amine
• 7-ethoxy-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-fluorophenyl)-N-7-(3-methoxypropyl)thiazolo[5,4-d]pyrimidine-5,7-diamine
• 2-(4-fluorophenyl)-7-morpholino-thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-fluorobenzyl)-7-morpholino-thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-fluorophenyl)-7-(4-m-tolylpiperazin-1-yl)-thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-fluorophenyl)-7-(4-(thiazol-2-yl)piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-fluorophenyl)-7-(4-pentylpiperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-1-morpholinoethanone
• 7-(4-benzylpiperazin-1-yl)-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-5-amine
• benzyl-4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazine-1-carboxylate
• 2-(4-fluorophenyl)-7-(4-(phenylsulfonyl)piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 4-(5-amino-2-(4-fluorophenyl)-thiazolo[5,4-d]pyrimidin-7-yl)-N-p-tolylpiperazine-1-carboxamide
• 4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide
• 4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide
• 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorophenyl)-5-methylthiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone
• 1-(4-(5-amino-2-(2-(4-fluorophenoxy)ethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenethyl)-thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-fluorophenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(m-tolyloxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(2,4-dichlorophenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-3-(4-fluorophenoxy)propan-1-one
• 1-(4-(5-amino-2-(1-(4-fluorophenyl)ethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(5-amino-2-(1-(4-fluorophenyl)-2-phenylethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 4-(5-amino-2-(1-(4-fluorophenyl)ethyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide
• 5-amino-2-cyclopropyl-7-methoxythiazolo[5,4-d]pyrimidine
• 5-amino-2-cyclopropyl-7-N-piperazino-thiazolo[5,4-d]pyrimidine
• 5-amino-2-(3,4-dichlorophenyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine
• 5-amino-2-(1-phenylcyclopropyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine
• 5-amino-2-(1-(4-chlorophenyl)cyclopropyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine
• 5-amino-7-N-piperazino-2-methylthio-thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(1-phenylcyclopropyl)thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-methylthio-thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(3,4-dichlorophenyl)thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(1-(4-chlorophenyl)cyclopropyl)thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(2-phenylethyl)thiazolo[5,4-d]pyrimidine
• 5-amino-2-cyclopropyl-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-cyclohexylthiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(pyridine-3-yl)thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(N-oxopyridine-3-yl)thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(4-chlorophenylmethyl)thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(4-chlorophenyl)thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(3-methoxyphenyl)thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(1-(4-chlorophenyl)ethyl)thiazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(4-fluorophenylamino)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-(4-fluorophenyl)-7-(4-[2-(4-bromophenoxy)acetyl]-piperazin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-(4-fluorophenyl)-7-(4-[2-(3-nitrophenoxy)acetyl]-piperazin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-(4-fluorophenyl)-7-(4-(2-phenoxyacetyl)-piperazin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(3-nitrophenoxy)acetyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(4-chlorophenyl)acetyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-m-tolylcarbamoylpiperazin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-phenoxyacetyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-[4-(4-chlorobenzoyl)piperazin-1-yl]-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-[4-(3-phenylpropionyl)piperazin-1-yl]-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-[4-phenylmethanesulfonylpiperazin-1-yl]-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(4-chlorophenoxy)acetyl]homopiperazin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[(methylphenylcarbamoyl)-methyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-thiazol-2-yl-piperazine-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-(phenethylcarbamoyl-methyl)piperazin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-((3-(R)-tert-butoxycarbonylamino)pyrrolidin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(3-(R)-[2-(4-chlorophenoxy)-acetylamino]pyrrolidin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(3-(R)-(4-chlorobenzoylamino)-pyrrolidin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(1-benzyloxycarbonylpiperidin-3-ylamino)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(1-tert-butoxycarbonylpyrrolidin-3-(S)-ylamino)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(1-(4-chlorophenoxyacetyl)pyrrolidin-3-(S)-ylamino)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-benzoylpiperidine-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-(2-phenoxyethyl)piperazin-1-yl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-[1-(4-fluorophenyl)propyl]-7-(4-[2-(4-chlorophenoxy)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine
• 5-amino-2-[cyclopentyl-(4-fluorophenyl)methyl]-7-(4-[2-(4-chlorophenoxy)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine
• 5-amino-7-piperazin-1-yl-2-(2-thiophen-2-yl-ethyl)-thiazolo[5,4-d]pyrimidine
• 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-[2-(4-chloro-phenoxy)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine
• 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-[2-(4-chloro-phenyl)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine
• 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-(4-chloro-benzoyl)piperazin-1-yl)thiazolo[5,4-d]pyrimidine
• 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-m-tolylcarbamoylpiperazin-1-yl)thiazolo[5,4-d]pyrimidine
• 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorophenyl)oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone
• 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorophenyl)-5-methyl-oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone
• 1-(4-(5-amino-2-(4-fluorophenyl)oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorobenzyl)oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone
• 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorobenzyl)-5-methyloxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone
• 1-(4-(5-amino-2-(4-fluorophenethyl)oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• N-(3-chloro-4-fluorophenyl)-2-(4-fluorophenyl)-oxazolo[5,4-d]pyrimidin-7-amine
• N-7-(3-chloro-4-fluorophenyl)-2-(4-fluorophenyl)-oxazolo[5,4-d]pyrimidine-5,7-diamine
• 5-amino-2-cyclopropyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine
• 5-amino-2-methoxymethyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine
• 5-amino-2-cyclohexyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine
• 5-amino-2-pentyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine
• 5-amino-2-(2-phenylethyl)-7-N-piperazino-oxazolo[5,4-d]pyrimidine
• 5-amino-2-cyclopropyl-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-oxazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-methoxymethyloxazolo[5,4-d]pyrimidine
• 5-amino-2-cyclohexyl-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]oxazolo[5,4-d]pyrimidine
• 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-pentyloxazolo[5,4-d]pyrimidine
• 5-amino-2-(2-phenylethyl)-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]oxazolo[5,4-d]pyrimidine
• 5-amino-2-(4-fluorophenyl)-7-(4-isobutylpiperazin-1-yl)-oxazolo[5,4-d]pyrimidine
• 5-amino-2-(4-fluorophenyl)-7-(4-acetylpiperazin-1-yl)-oxazolo[5,4-d]pyrimidine
• 5-amino-2-(4-fluorophenyl)-7-[4-(2-methoxyethyl)-piperazin-1-yl]-oxazolo[5,4-d]pyrimidine
• 5-amino-2-(4-fluorophenyl)-7-(4-[2-(3-nitrophenoxy)acetyl]-piperazin-1-yl)-oxazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(4-chlorophenyl)acetyl]-piperazin-1-yl)-oxazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[4-chlorobenzoyl]piperazin-1-yl)-oxazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-m-tolylcarbamoylpiperazin-1-yl)-oxazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-(2-phenoxyethyl)piperazin-1-yl)-oxazolo[5,4-d]pyrimidine
• 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[(methylphenyl-carbamoyl)methyl]piperazin-1-yl)-oxazolo[5,4-d]pyrimidine
• 5-amino-2-phenyl-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine
• 5-amino-2-(2-furyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine
• 5-amino-2-(4-fluoro-phenyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine
• 1-(4-(5-amino-2-phenylthiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(furan-2-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-fluorophenoxy)ethanone
• 1-(4-(5-amino-2-(furan-2-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(m-tolyloxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(m-tolyloxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(2,4-dichlorophenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chloro-2-methylphenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(3-chlorophenoxy)ethanone
• 1-(4-(5-amino-2-phenylthiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-cyanophenyl)piperazine-1-carboxamide
• 4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(2,4-difluorophenyl)piperazine-1-carboxamide
• 4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-bromophenyl)piperazine-1-carboxamide
• 4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(2-methoxyphenyl)piperazine-1-carboxamide
• 4-(5-amino-2-phenylthiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide
• 5-amino-7-(N-piperazin-1-yl)-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidine
• 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-p-tolylpiperazine-1-carboxamide
• 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-3-(4-bromophenyl)propan-1-one
• 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-hydroxyphenoxy)ethanone
• methyl 4-(2-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-oxoethoxy)benzoate
• 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-(trifluoromethoxy)phenoxy)ethanone
• 2-(4-acetylphenoxy)-1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone
• 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(3-chlorophenoxy)ethanone
• 4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-cyanophenyl)piperazine-1-carboxamide
• 1-(4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone
• 4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-cyanophenyl)piperazine-1-carboxamide
• 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-fluorophenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone
• 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-3-(4-fluorophenyl)propan-1-one
• 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)-2-methylpropan-1-one
• 2-(3-methoxyphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 2-(3,4-dimethoxyphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-methylphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 1-(4-(5-amino-2-(3-methoxyphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(3-methoxyphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone
• 1-(4-(5-amino-2-(3-methoxyphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(5-amino-2-(3,4-dimethoxyphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone
• 1-(4-(5-amino-2-(3,4-dimethoxyphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(4-methylphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone
• 1-(4-(5-amino-2-(4-methylphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(4-methylphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 7-(piperazin-1-yl)-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 7-(piperazin-1-yl)-2-(pyridin-2-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 7-(piperazin-1-yl)-2-(pyridin-4-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-chlorophenyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 1-(4-(5-amino-2-(4-chlorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-fluorophenoxy)ethanone
• 1-(4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-trifluoromethoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)-2-methylpropan-1-one
• 1-(4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(m-tolyloxy)ethanone
• 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide
• 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-chlorophenyl)piperazine-1-carboxamide
• 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-methoxybenzyl)piperazine-1-carboxamide
• 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-cyanophenyl)piperazine-1-carboxamide
• 1-(4-(5-amino-2-(4-chlorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(pyridin-4-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(5-amino-2-(pyridin-2-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 2-(4-fluorophenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidine
• 2-(4-fluorophenyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidine
• 2-(3-(4-fluorophenyl)propyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-(4-fluorophenyl)butyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 2-(4-bromophenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 2-pentyl-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine
• 7-(piperazin-1-yl)-2-p-tolylthiazolo[5,4-d]pyrimidin-5-amine
• 1-(4-(5-amino-2-(3-(4-fluorophenyl)propyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(5-amino-2-(3-(4-fluorophenyl)propyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(4-(4-fluorophenyl)butyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(5-amino-2-(4-(4-fluorophenyl)butyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-p-tolylthiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-p-tolylthiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(5-amino-2-pentylthiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-pentylthiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(5-amino-2-(4-bromophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(5-amino-2-(4-bromophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 2-(4-chlorophenoxy)-1-(4-(6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)ethanone
• 1-(4-(2-butyl-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)piperazin-1-O-2-(4-chlorophenoxy)ethanone
• N-(3-chloro-4-fluorophenyl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-amine
• 2-butyl-N-(3-chloro-4-fluorophenyl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-amine
• 2-(4-chlorophenoxy)-1-(4-(6-(4-fluorophenyl)-2-methylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)ethanone
• 1-(4-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 2-amino-4-N-benzylamino-6-(4-fluorophenyl)-thieno[2,3-d]pyrimidine
• 2-amino-4-N-piperazinyl-6-phenyl-thieno[2,3-d]pyrimidine
• 1-(4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)-N-m-tolylpiperazine-1-carboxamide
• 4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)-N-(4-chlorophenyl)piperazine-1-carboxamide
• 1-(4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-2-phenoxyethanone
• 2-amino-4-N-homopiperazinyl-6-phenyl-thieno[2,3-d]pyrimidine
• 1-(4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)-1,4-diazepan-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)-1,4-diazepan-1-yl)(4-chlorophenyl)methanone
• 2-(4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-N-methyl-N-phenylacetamide
• 4-(4-(2-phenoxyethyl)piperazin-1-yl)-6-phenylthieno[2,3-d]pyrimidin-2-amine
• (R)-tert-butyl 1-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)pyrrolidin-3-ylcarbamate
• (R)-4-(3-aminopyrrolidin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-2-amine
• (R)—N-(1-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)pyrrolidin-3-yl)-2-(4-chlorophenoxy)acetamide
• (R)—N-(1-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)pyrrolidin-3-yl)-4-chlorobenzamide
• 2-amino-4-N-piperazinyl-6-(4-fluorophenyl)-thieno[2,3-d]pyrimidine
• 1-(4-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-3-phenylpropan-1-one
• 4-(4-(benzylsulfonyl)piperazin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-2-amine
• (4-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)(cyclohexyl)methanone
• 4-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)(pyridin-3-yl)methanone
• 4-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)-N,N-diisopropylpiperazine-1-carboxamide
• (1-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)piperidin-4-yl)(phenyl)methanone
• 2-amino-4-N-piperazino-thieno[2,3-d]pyrimidine
• 1-(4-(2-aminothieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 2-(4-chlorophenoxy)-1-(4-(6-(4-fluorophenyl)-2-phenylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)ethanone
• ethyl 4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidine-2-carboxylate
• ethyl 2-(4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-2-yl)acetate
• 4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidine-2-carboxamide
• 4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)-N-(2-methoxyethyl)thieno[2,3-d]pyrimidine-2-carboxamide
• 4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidine-2-carboxylic acid
• 2-(4-(4-(2-(4-chlorophenoxy)acetyl)piperazin-1-yl)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-2-yl)acetamide
• 4-(2-amino-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-4-yl)-N-m-tolylpiperazine-1-carboxamide
• 4-(6-(4-fluorophenyl)-2-phenylthieno[2,3-d]pyrimidin-4-yl)-N-m-tolylpiperazine-1-carboxamide
• ethyl 6-(4-fluorophenyl)-4-(4-(m-tolylcarbamoyl)piperazin-1-yl)thieno[2,3-d]pyrimidine-2-carboxylate
• 6-(4-fluorophenyl)-4-(4-(m-tolylcarbamoyl)piperazin-1-yl)thieno[2,3-d]pyrimidine-2-carboxamide
• 4-ethoxy-6-(4-fluorophenyl)thieno[2,3-d]pyrimidin-2-amine
• 6-(4-fluorophenyl)-4-morpholinothieno[2,3-d]pyrimidin-2-amine
• N-(3-chloro-4-fluorophenyl)-6-(4-fluorophenyl)-2-methylthieno[2,3-d]pyrimidin-4-amine
• ethyl 4-(3-chloro-4-fluorophenylamino)-6-(4-fluorophenyl)thieno[2,3-d]pyrimidine-2-carboxylate
• 1-(4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone
• 1-(4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-2-(4-fluorophenoxy)ethanone
• 1-(4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-2-(m-tolyloxy)ethanone
• 1-(4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone
• 1-(4-(2-amino-6-phenylthieno[2,3-d]pyrimidin-4-yl)piperazin-1-yl)-2-(4-chlorophenoxy)-2-methylpropan-1-one
• 1-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(3,4-dimethoxyphenyl)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(4-bromophenyl)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(4-chlorophenyl)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(3-chlorophenyl)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(4-(trifluoromethyl)phenyl)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(4-(trifluoromethoxy)phenyl)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-p-tolyl-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-propyl-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-cyclopropyl-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-tert-butyl-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-methyl-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-2-phenoxyethanone
• 1-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)(3-methoxyphenyl)methanone
• 1-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-2-(thiophen-2-yl)ethanone
• (4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)(4-chlorophenyl)methanone
• 6-(4-(benzylsulfonyl)piperazin-1-yl)-8-(4-fluorophenyl)-9H-purin-2-amine
• (4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)(naphthalen-1-yl)methanone
• 1-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)ethanone
• 8-(4-fluorophenyl)-6-(4-(thiazol-2-yl)piperazin-1-yl)-9H-purin-2-amine
• 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-1-(pyrrolidin-1-yl)ethanone
• 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-1-morpholinoethanone
• 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-N-(pyridin-3-yl)acetamide
• 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-N-methyl-N-phenylacetamide
• 6-(4-(4-chlorophenyl)piperazin-1-yl)-8-(4-fluorophenyl)-9H-purin-2-amine
• 8-(4-fluorophenyl)-6-(4-(4-fluorophenyl)piperazin-1-yl)-9H-purin-2-amine
• 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-N-(pyridin-2-yl)acetamide
• 2-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-N-(thiazol-2-yl)acetamide
• 6-(4-(4-fluorobenzyl)piperazin-1-yl)-8-(4-fluorophenyl)-9H-purin-2-amine
• 8-(4-fluorophenyl)-6-(4-(pyridin-4-yl)piperazin-1-yl)-9H-purin-2-amine
• 6-(1,4-diazepan-1-yl)-8-(4-fluorophenyl)-9H-purin-2-amine
• 1-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)-1,4-diazepan-1-yl)-2-(4-chlorophenoxy)ethanone
• 4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)-N-m-tolyl-1,4-diazepane-1-carboxamide
• 1-(4-(2-amino-8-thioxo-8,9-dihydro-7H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(methylthio)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(propylthio)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(benzylthio)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(phenethylthio)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-9-methyl-8-(methylthio)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(cyclopentylthio)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-8-(4-fluorophenyl)-9-methyl-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 1-(4-(2-amino-9-benzyl-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone
• 2-amino-6-(piperazin-1-yl)-8-(4-fluorophenyl)-9H-purine
• 1-(4-(2-amino-8-(4-fluorophenyl)-9H-purin-6-yl)piperazin-1-yl)-3-phenylpropan-1-one
• 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-(trifluoromethyl)phenyl)piperazine-1-carboxamide
• 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-phenylpiperazine-1-carboxamide
• 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-cyclohexylpiperazine-1-carboxamide
• 5-amino-7-[4-(N-4-fluorophenylcarboxamide)piperazin-1-yl]-2-(pyridine-3-yl)thiazolo[5,4-d]pyrimidine
• 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-hexylpiperazine-1-carboxamide
• 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-p-tolylpiperazine-1-carbothioamide
• 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-methyl-N-p-tolylpiperazine-1-carboxamide
• p-tolyl 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazine-1-carboxylate.

In another particular embodiment, the invention relates to thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of formula I, II, III, or IV, as well as pharmaceutical compositions for use as a medicine for the prevention or treatment of a viral infection in an animal, mammal or human, said pharmaceutical compositions comprising such thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives as active principle, represented by the above mentioned structural formula I, II, III, or IV and being in the form of a pharmaceutically acceptable salt. The latter include any therapeutically active nontoxic addition salt which compounds represented by structural formula I, II, III, or IV are able to form with a salt-forming agent. Such addition salts may conveniently be obtained by treating the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of the invention with an appropriate salt-forming acid or base. For instance, thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives having basic properties may be converted into the corresponding therapeutically active, non-toxic acid addition salt form by treating the free base form with a suitable amount of an appropriate acid following conventional procedures. Examples of such appropriate salt-forming acids include, for instance, inorganic acids resulting in forming salts such as but not limited to hydrohalides (e.g. hydrochloride and hydrobromide), sulfate, nitrate, phosphate, diphosphate, carbonate, bicarbonate, and the like; and organic monocarboxylic or dicarboxylic acids resulting in forming salts such as, for example, acetate, propanoate, hydroxyacetate, 2-hydroxypropanoate, 2-oxopropanoate, lactate, pyruvate, oxalate, malonate, succinate, maleate, fumarate, malate, tartrate, citrate, methanesulfonate, ethanesulfonate, benzoate, 2-hydroxybenzoate, 4-amino-2-hydroxybenzoate, benzene-sulfonate, p-toluenesulfonate, salicylate, p-aminosalicylate, palmoate, bitartrate, camphorsulfonate, edetate, 1,2-ethanedisulfonate, fumarate, glucoheptonate, gluconate, glutamate, hexylresorcinate, hydroxynaphthoate, hydroxyethanesulfonate, mandelate, methylsulfate, pantothenate, stearate, as well as salts derived from ethanedioic, propanediol, butanedioic, (Z)-2-butenedioic, (E)2-butenedioic, 2-hydroxybutanedioic, 2,3-dihydroxybutane-dioic, 2-hydroxy-1,2,3-propanetricarboxylic and cyclohexanesulfamic acids and the like. Thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of this invention, including the ones represented by the structural formula I, II, III, or IV, having acidic properties may be converted in a similar manner into the corresponding therapeutically active, non-toxic base addition salt form. Examples of appropriate salt-forming bases include, for instance, inorganic bases like metallic hydroxides such as but not limited to those of alkali and alkaline-earth metals like calcium, lithium, magnesium, potassium and sodium, or zinc, resulting in the corresponding metal salt; organic bases such as but not limited to ammonia, alkylamines, benzathine, hydrabamine, arginine, lysine, dibenzylethylenediamine, chloroprocaine, choline, diethanolamine, ethylene-diamine, N-methylglucamine, procaine and the like.

Reaction conditions for treating the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine or purine derivatives of this invention, including the ones represented by the structural formula I, II, III, or IV, with an appropriate salt-forming acid or base are similar to standard conditions involving the same acid or base but different organic compounds with basic or acidic properties, respectively. Preferably, in view of its use in a pharmaceutical composition or in the manufacture of a medicament for treating specific diseases, the pharmaceutically acceptable salt will be designed, i.e. the salt-forming acid or base will be selected so as to impart greater water-solubility, lower toxicity, greater stability and/or slower dissolution rate to the thiazolo(5,4-d)pyrimidine or oxazolo(5,4-d)pyrimidine derivative of this invention.

Another aspect of the present invention relates to the thiazolo[5,4-d]pyrimidine oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of the invention, including the thiazolo[5,4-d]pyrimidine, oxazolo(5,4-d)pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of formula I, II, III and IV, for use as a medicine and to the use of said thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine or purine derivatives as a medicine to treat or prevent viral disorders, including viral infections, in an animal, more specifically a mammal such as a human being. In more specific embodiments, said viral infection is an infection with a virus from the family of the Retroviridae, the family of the Flaviviridae or the PicoRNAviridae. In more particular embodiments, said viral infection is an infection with a virus of the genus Lentivirus, Hepacivirus, Flavivirus, or Enterovirus. In even more particular embodiments, said viral infection is an infection with a virus of the species HIV1, HIV2, HCV, Dengue virus, Poliovirus, Rhinovirus or Coxsackie virus.

The present invention further relates to a method for preventing or treating a viral infection in a subject or patient by administering to the patient in need thereof a therapeutically effective amount of the compounds of the present invention, including the thiazolo[5,4-d]pyrimidine oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of the invention, including the thiazolo[5,4-d]pyrimidine, oxazolo(5,4-d)pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of formula I, II, III and IV. The therapeutically effective amount of said compound(s), especially for the treatment of viral infections in humans and other mammals, preferably is a viral replication inhibiting amount. More preferably, it is a viral replication inhibiting amount of the derivative(s) of formula I, II, III and IV as defined herein. Depending upon the pathologic condition to be treated and the patient's condition, the said effective amount may be divided into several sub-units per day or may be administered at more than one day intervals.

Another aspect of the present invention relates to the pharmaceutical composition of the invention for use as a medicine and to the use of said pharmaceutical composition as a medicine to treat or prevent viral disorders, including viral infections, in an animal, more specifically a mammal such as a human being. In more specific embodiments, said viral infection is an infection with a virus from the family of the Retroviridae, the family of the Flaviviridae or the PicoRNAviridae. In more particular embodiments, said viral infection is an infection with a virus of the genus Lentivirus, Hepacivirus, Flavivirus, or Enterovirus. In even more particular embodiments, said viral infection is an infection with a virus of the species HIV1, HIV2, HCV, Dengue virus, Poliovirus, Rhinovirus or Coxsackie virus.

The present invention further provides the use of thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of this invention, including the ones represented by the structural formula I, II, III, or IV, or a pharmaceutically acceptable salt or a solvate thereof, as a biologically active ingredient, i.e. active principle, especially as a medicine or a diagnostic agent or for the manufacture of a medicament or a diagnostic kit. In a particular embodiment, said medicament may be for the prevention or treatment of viral disorders including viral infections in an animal, preferably a mammal, and more preferably a human. In more specific embodiments, said viral infection is an infection with a virus from the family of the Retroviridae, the family of the Flaviviridae or the PicoRNAviridae. In more particular embodiments, said viral infection is an infection with a virus of the genus Lentivirus, Hepacivirus, Flavivirus, or Enterovirus. In even more particular embodiments, said viral infection is an infection with a virus of the species HIV1, HIV2, HCV, Dengue virus, Poliovirus, Rhinovirus or Coxsackie virus.

The present invention further provides the use of thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of this invention, including the ones represented by the structural formula I, II, III, or IV, or a pharmaceutically acceptable salt or a solvate thereof, as a biologically active ingredient, i.e. active principle such as a viral replication inhibiting amount of the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of this invention including the ones represented by the structural formula I, II, III, or IV, or a pharmaceutically acceptable salt or a solvate thereof.

The present invention further provides the use of the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of this invention, including the ones represented by the structural formula I, II, III, or IV, or a pharmaceutically acceptable salt or a solvate thereof, as a biologically active ingredient, i.e. active principle, especially as a medicine or for the manufacture of a medicament for treating a viral disorder, including a viral infection in an animal, preferably a mammal, and more preferably a human. In more specific embodiments, said viral infection is an infection with a virus from the family of the Retroviridae, the family of the Flaviviridae or the PicoRNAviridae. In more particular embodiments, said viral infection is an infection with a virus of the genus Lentivirus, Hepacivirus, Flavivirus, or Enterovirus. In even more particular embodiments, said viral infection is an infection with a virus of the species HIV1, HIV2, HCV, Dengue virus, Poliovirus, Rhinovirus or Coxsackie virus.

The pathologic conditions and disorders concerned by the said use, and the corresponding methods of prevention or treatment, are detailed herein below. Any of the uses mentioned with respect to the present invention may be restricted to a nonmedical use (e.g. in a cosmetic composition), a non-therapeutic use, a non-diagnostic use, a non-human use (e.g. in a veterinary composition), or exclusively an in-vitro use, or a use with cells remote from an animal. The invention further relates to a pharmaceutical composition comprising: (a) one or more thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and/or purine derivatives of this invention, including the ones represented by the structural formula I, II, III, or IV, and (b) one or more pharmaceutically acceptable carriers.

The invention also relates to the compounds of the formulas described herein, including the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of this invention, including the ones represented by the structural formula I, II, III, or IV, or a pharmaceutically acceptable salt or a solvate thereof, being used for inhibition of the proliferation of other viruses than HIV1, HIV2, HCV, Dengue virus, Poliovirus & Coxsackie virus, particularly for the inhibition of other members of the family of the Flaviviridae, including but not limited to the Yellow fever virus, West Nile virus, Japanese encephalitis virus, Bovine Viral Diarrhea Virus (BVDV) hepatitis G virus, classical swine fever virus, border disease virus but also for the inhibition of other viruses including other members of the family of the Retroviridae such as an Alpharetrovirus, a Betaretrovirus, a Gammaretrovirus, a Deltaretrovirus, an Epsilonretrovirus, a Lentivirus, and a Spumavirus and other members of the family of the Picornaviridae such as an Aphthovirus, an Avihepatovirus, a Cardiovirus, an Enterovirus, an Erbovirus, a Hepatovirus, a Kobuvirus, a Parechovirus, a Sapelovirus, a Senecavirus, a Teschovirus, a Tremovirus.

In another embodiment, this invention provides combinations, preferably synergistic combinations, of one or more thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and/or purine derivatives of this invention with one or more biologically active drugs being preferably selected from the group consisting of antiviral drugs. In another embodiment said one or more biologically active drugs are selected from the group consisting of antiviral drugs and/or immunosuppressant and/or immunomodulator drugs. Suitable anti-viral agents for inclusion into the antiviral compositions or combined preparations of this invention include for instance, inhibitors of HIV replication, entoroviral replication (such as replication of Rhinovirus, Poliovirus or Coxsackievirus), Dengue virus replication or HCV replication, such as interferon-alfa (either pegylated or not), ribavirin and other selective inhibitors of the replication of HCV, such as a compound falling within the scope of disclosure EP1162196, WO 03/010141, WO 03/007945 and WO 03/010140, a compound falling within the scope of disclosure WO 00/204425, and other patents or patent applications within their patent families or all the foregoing filings.

As is conventional in the art, the evaluation of a synergistic effect in a drug combination may be made by analyzing the quantification of the interactions between individual drugs, using the median effect principle described by Chou et al. in Adv. Enzyme Reg. (1984) 22:27. Briefly, this principle states that interactions (synergism, additivity, antagonism) between two drugs can be quantified using the combination index (hereinafter referred as Cl) defined by the following equation: wherein ED_x is the dose of the first or respectively second drug used alone (1a, 2a), or in combination with the second or respectively first drug (1c, 2c), which is needed to produce a given effect. The said first and second drug have synergistic or additive or antagonistic effects depending upon Cl<1, Cl=1, or Cl>1, respectively. As will be explained in more detail herein below, this principle may be applied to a number of desirable effects such as, but not limited to, an activity against viral infection or viral replication, an activity against transplant rejection, an activity against immunosuppression or immunomodulation. For instance the present invention relates to a pharmaceutical composition or combined preparation having synergistic effects against a viral infection and containing: (a) one or more antiviral drugs, and (b) at least one thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and/or purine derivative of the invention, including the ones represented by the structural formula I, II, III, or IV and (c) optionally one or more pharmaceutical excipients or pharmaceutically acceptable carriers, for simultaneous, separate or sequential use in the treatment or prevention of a viral infection. For instance the present invention relates to a pharmaceutical composition or combined preparation having synergistic effects against immuno-suppression or immunomodulation and containing: (a) one or more immunosuppressant and/or immunomodulator drugs, and (b) at least one thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and/or purine derivative of the invention, including the ones represented by the structural formula I, II, III, or IV and (c) optionally one or more pharmaceutical excipients or pharmaceutically acceptable carriers, for simultaneous, separate or sequential use in the treatment or prevention of autoimmune disorders and/or in transplant-rejections.

Suitable immunosuppressant drugs for inclusion in the synergistic compositions or combined preparations of this invention belong to a well known therapeutic class. They are preferably selected from the group consisting of cyclosporine A, substituted xanthines (e.g. methylxanthines such as pentoxyfylline), daltroban, sirolimus, tacrolimus, rapamycin (and derivatives thereof such as defined below), leflunomide (or its main active metabolite A771726, or analogs thereof called malononitrilamides), mycophenolic acid and salts thereof (including the sodium salt marketed under the trade name Mofetil®), adrenocortical steroids, azathioprine, brequinar, gusperimus, 6-mercaptopurine, mizoribine, chloroquine, hydroxy-chloroquine and monoclonal antibodies with immunosuppressive properties (e.g. etanercept, infliximab or kineret). Adrenocortical steroids within the meaning of this invention mainly include glucocorticoids such as but not limited to ciprocinonide, desoxycorticosterone, fludrocortisone, flumoxonide, hydrocortisone, naflocort, procinonide, timobesone, tipredane, dexamethasone, methylprednisolone, methotrexate, prednisone, prednisolone, triamcinolone and pharmaceutically acceptable salts thereof. Rapamycin derivatives as referred herein include O-alkylated derivatives, particularly 9-deoxorapamycins, 26-dihydrorapamycins, 40-O-substituted rapamycins and 28,40-0,0-disubstituted rapamycins (as disclosed in U.S. Pat. No. 5,665,772) such as 40-O-(2-hydroxy) ethyl rapamycin—also known as SDZ-RAD-, pegylated rapamycin (as disclosed in U.S. Pat. No. 5,780,462), ethers of 7-desmethylrapamycin (as disclosed in U.S. Pat. No. 6,440,991) and polyethylene glycol esters of SDZ-RAD (as disclosed in U.S. Pat. No. 6,331,547).

Suitable immunomodulator drugs for inclusion into the synergistic immunomodulating pharmaceutical compositions or combined preparations of this invention are preferably selected from the group consisting of acemannan, amiprilose, bucillamine, dimepranol, ditiocarb sodium, imiquimod, Inosine Pranobex, interferon-β, interferon-γ, lentinan, levamisole, lisophylline, pidotimod, romurtide, platonin, procodazole, propagermanium, thymomodulin, thymopentin and ubenimex.

Synergistic activity of the pharmaceutical compositions or combined preparations of this invention against immunosuppression or immuno-modulation may be readily determined by means of one or more lymphocyte activation tests. Usually activation is measured via lymphocyte proliferation. Inhibition of proliferation thus always means immunosuppression under the experimental conditions applied. There exist different stimuli for lymphocyte activation, in particular: a) co-culture of lymphocytes of different species (mixed lymphocyte reaction, hereinafter referred as MLR) in a so-called mixed lymphocyte culture test: lymphocytes expressing different minor and major antigens of the HLA-DR type (=alloantigens) activate each other non-specifically; b) a CD3 assay wherein there is an activation of the T-lymphocytes via an exogenously added antibody (OKT3). This antibody reacts against a CD3 molecule located on the lymphocyte membrane which has a co-stimulatory function. Interaction between OKT3 and CD3 results in T-cell activation which proceeds via the Ca²+/calmodulin/calcineurin system and can be inhibited e.g. by cyclosporine A (hereinafter referred as CyA); and c) a CD28 assay wherein specific activation of the T-lymphocyte proceeds via an exogenously added antibody against a CD28 molecule which is also located on the lymphocyte membrane and delivers strong co-stimulatory signals. This activation is Ca²+-independent and thus cannot be inhibited by CyA. Determination of the immunosuppressing or immunomodulating activity of the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine or purine derivatives of this invention, as well as synergistic combinations comprising them, is preferably based on the determination of one or more, preferably at least three lymphocyte activation in vitro tests, more preferably including at least one of the MLR test, CD3 assay and CD28 assay referred above. Preferably the lymphocyte activation in vitro tests used include at least two assays for two different clusters of differentiation preferably belonging to the same general type of such clusters and more preferably belonging to type I transmembrane proteins. Optionally the determination of the immuno-suppressing or immunomodulating activity may be performed on the basis of other lymphocyte activation in vitro tests, for instance by performing a TNF-α assay or an IL-1 assay or an IL-6 assay or an IL-10 assay or an IL-12 assay or an assay for a cluster of differentiation belonging to a further general type of such clusters and more preferably belonging to type II transmembrane proteins such as, but not limited to, CD69, CD71 or CD134.

The synergistic effect may be evaluated by the median effect analysis method described herein before. Such tests may for instance, according to standard practice in the art, involve the use of equipment, such as flow cytometer, being able to separate and sort a number of cell subcategories at the end of the analysis, before these purified batches can be analyzed further.

Synergistic activity of the pharmaceutical compositions of this invention in the prevention or treatment of transplant rejection may be readily determined by means of one or more leukocyte activation tests performed in a Whole Blood Assay (hereinafter referred as WBA) described for instance by Lin et al. in Transplantation (1997) 63:1734-1738. WBA used herein is a lymphoproliferation assay performed in vitro using lymphocytes present in the whole blood, taken from animals that were previously given the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine or purine derivative of this invention, and optionally the other immunosuppressant drug, in vivo. Hence this assay reflects the in vivo effect of substances as assessed by an in vitro read-out assay. The synergistic effect may be evaluated by the median effect analysis method described herein before. Various organ transplantation models in animals are also available in vivo, which are strongly influenced by different immunogenicities, depending on the donor and recipient species used and depending on the nature of the transplanted organ. The survival time of transplanted organs can thus be used to measure the suppression of the immune response.

The pharmaceutical composition or combined preparation with synergistic activity against a viral infection and/or immunosuppression or immunomodulation according to this invention may contain the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and/or purine derivative of this invention, including the ones represented by the structural formulae I, II, III, or IV over a broad content range depending on the contemplated use and the expected effect of the preparation. Typically, the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and/or purine derivative content in the combined preparation is within the range of 0.1 to 99.9% by weight, preferably from 1 to 99% by weight, more preferably from about 5 to 95% by weight.

Auto-immune disorders to be prevented or treated by the pharmaceutical compositions or combined preparations of this invention include both:

• • systemic auto-immune diseases such as, but not limited to, lupus erythematosus, psoriasis, vasculitis, polymyositis, scleroderma, multiple sclerosis, ankylosing spondilytis, rheumatoid arthritis and Sjogren syndrome; auto-immune endocrine disorders such as thyroiditis; and
  • organ-specific auto-immune diseases such as, but not limited to, Addison disease, hemolytic or pernicious anemia, Goodpasture syndrome, Graves disease, idiopathic thrombocytopenic purpura, insulin-dependent diabetes mellitus, juvenile diabetes, uveitis, Crohn's disease, ulcerative colitis, pemphigus, atopic dermatitis, autoimmune hepatitis, primary biliary cirrhosis, autoimmune pneumonitis, autoimmune carditis, myasthenia gravis, glomerulonephritis and spontaneous infertility.

Transplant rejections to be prevented or treated by the pharmaceutical compositions or combined preparations of this invention include the rejection of transplanted or grafted organs or cells (both allografts and xenografts), such as but not limited to host versus graft reaction disease. The term “organ” as used herein means all organs or parts of organs in mammals, in particular humans, such as but not limited to kidney, lung, bone marrow, hair, cornea, eye (vitreous), heart, heart valve, liver, pancreas, blood vessel, skin, muscle, bone, intestine or stomach. The term “rejection” as used herein means all reactions of the recipient body or the transplanted organ which in the end lead to cell or tissue death in the transplanted organ or adversely affect the functional ability and viability of the transplanted organ or the recipient. In particular, this means acute and chronic rejection reactions. Also included in this invention is preventing or treating the rejection of cell transplants and xenotransplantation. The major hurdle for xenotransplantation is that even before the T lymphocytes, responsible for the rejection of allografts, are activated, the innate immune system, especially T-independent B lymphocytes and macrophages are activated. This provokes two types of severe and early acute rejection called hyperacute rejection and vascular rejection, respectively. The present invention addresses the problem that conventional immunosuppressant drugs like cyclosporine A are ineffective in xeno-transplantation. The ability of the compounds of this invention to suppress T-independent xeno-antibody production as well as macrophage activation may be evaluated in the ability to prevent xenograft rejection in athymic, T-deficient mice receiving xenogenic hamster-heart grafts.

The term “pharmaceutically acceptable carrier or excipient” as used herein in relation to pharmaceutical compositions and combined preparations means any material or substance with which the active principle, i.e. the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivative of this invention, including the ones represented by the structural formula I, II, III, or IV, and optionally an antiviral agent and/or an immunosuppressant or immunomodulator may be formulated in order to facilitate its application or dissemination to the locus to be treated, for instance by dissolving, dispersing or diffusing said composition, and/or to facilitate its storage, transport or handling without impairing its effectiveness. The pharmaceutically acceptable carrier may be a solid or a liquid or a gas which has been compressed to form a liquid, i.e. the compositions of this invention can suitably be used as concentrates, emulsions, solutions, granulates, dusts, sprays, aerosols, pellets or powders. Suitable pharmaceutical carriers for use in said pharmaceutical compositions and their formulation are well known to those skilled in the art. There is no particular restriction to their selection within the present invention although, due to the usually low or very low water-solubility of the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivatives of this invention, special attention will be paid to the selection of suitable carrier combinations that can assist in properly formulating them in view of the expected time release profile. Suitable pharmaceutical carriers include additives such as wetting agents, dispersing agents, stickers, adhesives, emulsifying or surface-active agents, thickening agents, complexing agents, gelling agents, solvents, coatings, antibacterial and antifungal agents (for example phenol, sorbic acid, chlorobutanol), isotonic agents (such as sugars or sodium chloride) and the like, provided the same are consistent with pharmaceutical practice, i.e. carriers and additives which do not create permanent damage to mammals.

The pharmaceutical compositions of the present invention may be prepared in any known manner, for instance by homogeneously mixing, dissolving, spray-drying, coating and/or grinding the active ingredients, in a one-step or a multi-steps procedure, with the selected carrier material and, where appropriate, the other additives such as surface-active agents, may also be prepared by micronisation, for instance in view to obtain them in the form of microspheres usually having a diameter of about 1 to 10 μm, namely for the manufacture of microcapsules for controlled or sustained release of the biologically active ingredient(s).

Suitable surface-active agents to be used in the pharmaceutical compositions of the present invention are non-ionic, cationic and/or anionic surfactants having good emulsifying, dispersing and/or wetting properties. Suitable anionic surfactants include both water-soluble soaps and water-soluble synthetic surface-active agents. Suitable soaps are alkaline or alkaline-earth metal salts, unsubstituted or substituted ammonium salts of higher fatty acids (C₁₀-C₂₂), e.g. the sodium or potassium salts of oleic or stearic acid, or of natural fatty acid mixtures obtainable form coconut oil or tallow oil. Synthetic surfactants include sodium or calcium salts of polyacrylic acids; fatty sulphonates and sulphates; sulphonated benzimidazole derivatives and alkylarylsulphonates. Fatty sulphonates or sulphates are usually in the form of alkaline or alkaline-earth metal salts, unsubstituted ammonium salts or ammonium salts substituted with an alkyl or acyl radical having from 8 to 22 carbon atoms, e.g. the sodium or calcium salt of lignosulphonic acid or dodecylsulphonic acid or a mixture of fatty alcohol sulphates obtained from natural fatty acids, alkaline or alkaline-earth metal salts of sulphuric or sulphonic acid esters (such as sodium lauryl sulphate) and sulphonic acids of fatty alcohol/ethylene oxide adducts. Suitable sulphonated benzimidazole derivatives preferably contain 8 to 22 carbon atoms. Examples of alkylarylsulphonates are the sodium, calcium or alcanolamine salts of dodecylbenzene sulphonic acid or dibutyl-naphtalenesulphonic acid or a naphthalene-sulphonic acid/formaldehyde condensation product. Also suitable are the corresponding phosphates, e.g. salts of phosphoric acid ester and an adduct of p-nonylphenol with ethylene and/or propylene oxide, or phospholipids. Suitable phospholipids for this purpose are the natural (originating from animal or plant cells) or synthetic phospholipids of the cephalin or lecithin type such as e.g. phosphatidylethanolamine, phosphatidylserine, phosphatidylglycerine, lysolecithin, cardiolipin, dioctanyl-phosphatidylcholine, dipalmitoylphoshatidylcholine and their mixtures. Suitable non-ionic surfactants include polyethoxylated and polypropoxylated derivatives of alkylphenols, fatty alcohols, fatty acids, aliphatic amines or amides containing at least 12 carbon atoms in the molecule, alkylarenesulphonates and dialkylsulphosuccinates, such as polyglycol ether derivatives of aliphatic and cycloaliphatic alcohols, saturated and unsaturated fatty acids and alkylphenols, said derivatives preferably containing 3 to 10 glycol ether groups and 8 to 20 carbon atoms in the (aliphatic) hydrocarbon moiety and 6 to 18 carbon atoms in the alkyl moiety of the alkylphenol. Further suitable non-ionic surfactants are water-soluble adducts of polyethylene oxide with poylypropylene glycol, ethylenediamino-polypropylene glycol containing 1 to 10 carbon atoms in the alkyl chain, which adducts contain 20 to 250 ethyleneglycol ether groups and/or 10 to 100 propyleneglycol ether groups. Such compounds usually contain from 1 to 5 ethyleneglycol units per propyleneglycol unit. Representative examples of non-ionic surfactants are nonylphenol-polyethoxyethanol, castor oil polyglycolic ethers, polypropylene/polyethylene oxide adducts, tributylphenoxypolyethoxyethanol, polyethyleneglycol and octylphenoxypolyethoxyethanol. Fatty acid esters of polyethylene sorbitan (such as polyoxyethylene sorbitan trioleate), glycerol, sorbitan, sucrose and pentaerythritol are also suitable non-ionic surfactants.

Suitable cationic surfactants include quaternary ammonium salts, preferably halides, having four hydrocarbon radicals optionally substituted with halo, phenyl, substituted phenyl or hydroxy; for instance quaternary ammonium salts containing as N-substituent at least one C₈-C₂₂ alkyl radical (e.g. cetyl, lauryl, palmityl, myristyl, oleyl and the like) and, as further substituents, unsubstituted or halogenated lower alkyl, benzyl and/or hydroxy-C_1-4 alkyl radicals. A more detailed description of surface-active agents suitable for this purpose may be found for instance in “McCutcheon's Detergents and Emulsifiers Annual” (MC Publishing Crop., Ridgewood, N.J., 1981), “Tensid-Taschenbuch”, 2^nd ed. (Hanser Verlag, Vienna, 1981) and “Encyclopaedia of Surfactants” (Chemical Publishing Co., New York, 1981). Structure-forming, thickening or gel-forming agents may be included into the pharmaceutical compositions and combined preparations of the invention. Suitable such agents are in particular highly dispersed silicic acid, such as the product commercially available under the trade name Aerosil; bentonites; tetraalkyl ammonium salts of montmorillonites (e.g., products commercially available under the trade name Bentone), wherein each of the alkyl groups may contain from 1 to 20 carbon atoms; cetostearyl alcohol and modified castor oil products (e.g. the product commercially available under the trade name Antisettle).

Gelling agents which may be included into the pharmaceutical compositions and combined preparations of the present invention include, but are not limited to, cellulose derivatives such as carboxymethylcellulose, cellulose acetate and the like; natural gums such as arabic gum, xanthum gum, tragacanth gum, guar gum and the like; gelatin; silicon dioxide; synthetic polymers such as carbomers, and mixtures thereof. Gelatin and modified celluloses represent a preferred class of gelling agents.

Other optional excipients which may be included in the pharmaceutical compositions and combined preparations of the present invention include additives such as magnesium oxide; azo dyes; organic and inorganic pigments such as titanium dioxide; UV-absorbers; stabilisers; odor masking agents; viscosity enhancers; antioxidants such as, for example, ascorbyl palmitate, sodium bisulfite, sodium metabisulfite and the like, and mixtures thereof; preservatives such as, for example, potassium sorbate, sodium benzoate, sorbic acid, propyl gallate, benzylalcohol, methyl paraben, propyl paraben and the like; sequestering agents such as ethylene-diamine tetraacetic acid; flavoring agents such as natural vanillin; buffers such as citric acid and acetic acid; extenders or bulking agents such as silicates, diatomaceous earth, magnesium oxide or aluminum oxide; densification agents such as magnesium salts; and mixtures thereof. Additional ingredients may be included in order to control the duration of action of the biologically-active ingredient in the compositions and combined preparations of the invention. Control release compositions may thus be achieved by selecting appropriate polymer carriers such as for example polyesters, polyamino-acids, polyvinyl-pyrrolidone, ethylene-vinyl acetate copolymers, methylcellulose, carboxy-methylcellulose, protamine sulfate and the like. The rate of drug release and duration of action may also be controlled by incorporating the active ingredient into particles, e.g. microcapsules, of a polymeric substance such as hydrogels, polylactic acid, hydroxymethyl-cellulose, polymethyl methacrylate and the other above-described polymers. Such methods include colloid drug delivery systems including, but not limited to liposomes, microspheres, microemulsions, nanoparticles, nanocapsules and so on. Depending on the route of administration, the pharmaceutical composition or combined preparation of the invention may also require protective coatings.

Pharmaceutical forms suitable for injectable use include sterile aqueous solutions or dispersions and sterile powders for the extemporaneous preparation thereof. Typical carriers for this purpose therefore include biocompatible aqueous buffers, ethanol, glycerol, propylene glycol, polyethylene glycol, complexing agents such as cyclodextrins and the like, and mixtures thereof.

Other modes of local drug administration can also be used. For example, the selected active agent may be administered by way of intracavernosal injection, or may be administered topically, in an ointment, gel or the like, or transdermal, including transscrotally, using a conventional transdermal drug delivery system. Intracavernosal injection can be carried out by use of a syringe or any other suitable device. An example of a hypodermic syringe useful herein is described in U.S. Pat. No. 4,127,118, injection being made on the dorsum of the penis by placement of the needle to the side of each dorsal vein and inserting it deep into the corpora.

Since, in the case of combined preparations including the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and purine derivative of this invention and an antiviral agent and/or an immunosuppressant or immunomodulator the ingredients do not necessarily bring out their synergistic therapeutic effect directly at the same time in the patient to be treated, the said combined preparation may be in the form of a medical kit or package containing the two ingredients in separate but adjacent form. In the latter context, each ingredient may therefore be formulated in a way suitable for an administration route different from that of the other ingredient, e.g. one of them may be in the form of an oral or parenteral formulation whereas the other is in the form of an ampoule for intravenous injection or an aerosol.

The present invention further relates to a method for preventing or treating at least one disease selected from the group consisting of a viral disorder, immune and auto-immune disorders, transplant rejections, in a patient, preferably a mammal, more preferably a human being. The method of this invention consists of administering to the patient in need thereof an effective amount of a thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine and/or purine derivative of this invention, including the ones represented by the structural formula I, II, III, or IV, optionally together with an effective amount of another immunosuppressant or immunomodulator or antineoplastic drug or antiviral agent or phosphodiesterase-4 inhibitor, or a pharmaceutical composition comprising the same, such as disclosed above in extensive details. The effective amount is usually in the range of about 0.01 mg to 20 mg, preferably about 0.1 mg to 5 mg, per day per kg bodyweight for humans. Depending upon the pathologic condition to be treated and the patient's condition, the said effective amount may be divided into several sub-units per day or may be administered at more than one day intervals. The patient to be treated may be any warm-blooded animal, preferably a mammal, more preferably a human being, suffering from said pathologic condition.

The preferred compounds of the present invention are non-sedating. In other words, a dose of such compounds that is twice the minimum dose sufficient to provide analgesia in an animal model for determining pain relief causes only transient (i.e. lasting for no more than half the time that pain relief lasts) or preferably no statistically significant sedation in an animal model assay of sedation (using the method described by Fitzgerald et al. in Toxicology (1988) 49:433-9). Preferably, a dose that is five times the minimum dose sufficient to provide analgesia does not produce statistically significant sedation. More preferably, a compound provided herein does not produce sedation at intravenous doses of less than 10 mg/kg per day or at oral doses of less than 30 mg/kg per day. If desired, compounds provided herein may be evaluated for toxicity (a preferred compound is non-toxic when an immunomodulating amount or a cell anti-proliferative amount is administered to a subject) and/or side effects (a preferred compound produces side effects comparable to placebo when a therapeutically effective amount of the compound is administered to a subject). Toxicity and side effects may be assessed using any standard method. In general, the term “non-toxic” as used herein shall be understood as referring to any substance that, in keeping with established criteria, is susceptible to approval by the United States Federal Drug Administration for administration to mammals, preferably humans. Toxicity may be also evaluated using assays including bacterial reverse mutation assays, such as an Ames test, as well as standard teratogenicity and tumorogenicity assays. Preferably, administration of compounds provided herein within the therapeutic dose ranges disclosed hereinabove does not result in prolongation of heart QT intervals (e.g. as determined by electrocardiography in guinea pigs, minipigs or dogs). When administered daily, such doses also do not cause liver enlargement resulting in an increase of liver to body weight ratio of more than 50% over matched controls in laboratory rodents (e.g. mice or rats). Such doses also preferably do not cause liver enlargement resulting in an increase of liver to body weight ratio of more than 10% over matched untreated controls in dogs or other non-rodent mammals. The preferred compounds of the present invention also do not promote substantial release of liver enzymes from hepatocytes in vivo, i.e. the therapeutic doses do not elevate serum levels of such enzymes by more than 50% over matched untreated controls in vivo in laboratory rodents.

Another embodiment of this invention includes the various precursor or “prodrug” forms of the compounds of the present invention. It may be desirable to formulate the compounds of the present invention in the form of a chemical species which itself is not significantly biologically active, but which when delivered to the body of a human being or higher mammal will undergo a chemical reaction catalyzed by the normal function of the body, inter alia, enzymes present in the stomach or in blood serum, said chemical reaction having the effect of releasing a compound as defined herein. The term “prodrug” or “pro-drug” thus relates to these species which are converted in vivo into the active pharmaceutical ingredient.

The pro-drugs of the present invention can have any form suitable to the formulator, for example, esters are non-limiting common pro-drug forms. In the present case, however, the pro-drug may necessarily exist in a form wherein a covalent bond is cleaved by the action of an enzyme present at the target locus. For example, a C—C covalent bond may be selectively cleaved by one or more enzymes at said target locus and, therefore, a pro-drug in a form other than an easily hydrolysable precursor, inter alia an ester, an amide, and the like, may be used.

For the purposes of the present invention the term “therapeutically suitable pro-drug” is defined herein as a compound modified in such a way as to be transformed in vivo to the therapeutically active form, whether by way of a single or by multiple biological transformations, when in contact with the tissues of humans or mammals to which the pro-drug has been administered, and without undue toxicity, irritation, or allergic response, and achieving the intended therapeutic outcome. The present invention will be further described with reference to certain more specific embodiments and examples, but the present invention is not limited thereto. The following examples are given by way of illustration only.

DEFINITIONS

When describing the compounds of the invention, the terms used are to be construed in accordance with the following definitions, unless a context dictates otherwise.

As used herein with respect to a substituting radical, and unless otherwise stated, the term “C_1-7 alkyl” means straight and branched chain saturated acyclic hydrocarbon monovalent radicals having from 1 to 7 carbon atoms such as, for example, methyl, ethyl, propyl, n-butyl, 1-methylethyl (isopropyl), 2-methylpropyl (isobutyl), 1,1-dimethylethyl (ter-butyl), 2-methylbutyl, n-pentyl, dimethylpropyl, n-hexyl, 2-methylpentyl, 3-methylpentyl, n-heptyl and the like. By analogy, the term “C_1-12 alkyl” refers to such radicals having from 1 to 12 carbon atoms, i.e. up to and including dodecyl.

As used herein with respect to a substituting radical, and unless otherwise stated, the term “acyl” broadly refers to a substituent derived from an acid such as an organic monocarboxylic acid, a carbonic acid, a carbamic acid (resulting into a carbamoyl substituent) or the thioacid or imidic acid (resulting into a carbamidoyl substituent) corresponding to said acids, and the term “sulfonyl” refers to a substituent derived from an organic sulfonic acid, wherein said acids comprise an aliphatic, aromatic or heterocyclic group in the molecule. In a more specific embodiment of the invention said acyl group, within the scope of the above definition, refers to a carbonyl (oxo) group adjacent to a C_1-7 alkyl, a C_3-10 cycloalkyl, an aryl, an arylalkyl or a heterocyclic group, all of them being such as herein defined. Suitable examples of acyl groups are to be found below. In a more specific embodiment of the invention said “sulfonyl” group, within the scope of the above definition, refers to a sulfonyl group adjacent to a C_1-7 alkyl, a C_3-10 cycloalkyl, an aryl, an arylalkyl or a heterocyclic group, all of them being such as herein defined.

Acyl and sulfonyl groups originating from aliphatic or cycloaliphatic monocarboxylic acids or sulfonic acids are designated herein as aliphatic or cycloaliphatic acyl and sulfonyl groups and include, but are not limited to, the following:

• • alkanoyl (for example formyl, acetyl, propionyl, butyryl, isobutyryl, valeryl, isovaleryl, pivaloyl and the like);
  • cycloalkanoyl (for example cyclobutanecarbonyl, cyclopentanecarbonyl, cyclohexanecarbonyl, 1-adamantanecarbonyl and the like);
  • cycloalkyl-alkanoyl (for example cyclohexylacetyl, cyclopentylacetyl and the like);
  • alkenoyl (for example acryloyl, methacryloyl, crotonoyl and the like);
  • alkylthioalkanoyl (for example methylthioacetyl, ethylthioacetyl and the like);
  • alkanesulfonyl (for example mesyl, ethanesulfonyl, propanesulfonyl and the like);
  • alkoxycarbonyl (for example methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl, isobutoxycarbonyl and the like);
  • alkylcarbamoyl (for example methylcarbamoyl and the like);
  • (N-alkyl)-thiocarbamoyl (for example (N-methyl)-thiocarbamoyl and the like);
  • alkylcarbamidoyl (for example methylcarbamidoyl and the like); and
  • alkoxalyl (for example methoxalyl, ethoxalyl, propoxalyl and the like);

Acyl and sulfonyl groups may also originate from aromatic monocarboxylic acids and include, but are not limited to, the following:

• • aroyl (for example benzoyl, toluoyl, xyloyl, 1-naphthoyl, 2-naphthoyl and the like);
  • aralkanoyl (for example phenylacetyl and the like);
  • aralkenoyl (for example cinnamoyl and the like);
  • aryloxyalkanoyl (for example phenoxyacetyl and the like);
  • arylthioalkanoyl (for example phenylthioacetyl and the like);
  • arylaminoalkanoyl (for example N-phenylglycyl, and the like);
  • arylsulfonyl (for example benzenesulfonyl, toluenesulfonyl, naphthalene sulfonyl and the like);
  • aryloxycarbonyl (for example phenoxycarbonyl, naphthyloxycarbonyl and the like);
  • aralkoxycarbonyl (for example benzyloxycarbonyl and the like);
  • arylcarbamoyl (for example phenylcarbamoyl, naphthylcarbamoyl and the like);
  • arylglyoxyloyl (for example phenylglyoxyloyl and the like).
  • arylthiocarbamoyl (for example phenylthiocarbamoyl and the like); and
  • arylcarbamidoyl (for example phenylcarbamidoyl and the like).

Acyl groups may also originate from an heterocyclic monocarboxylic acids and include, but are not limited to, the following:

• • heterocyclic-carbonyl, in which said heterocyclic group is as defined herein, preferably an aromatic or non-aromatic 5- to 7-membered heterocyclic ring with one or more heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur in said ring (for example thiophenoyl, furoyl, pyrrolecarbonyl, nicotinoyl and the like); and
  • heterocyclic-alkanoyl in which said heterocyclic group is as defined herein, preferably an aromatic or non-aromatic 5- to 7-membered heterocyclic ring with one or more heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur in said ring (for example thiopheneneacetyl, furylacetyl, imidazolylpropionyl, tetrazolylacetyl, 2-(2-amino-4-thiazolyl)-2-methoxyiminoacetyl and the like).

As used herein with respect to a substituting radical, and unless otherwise stated, the term “thioacyl” refers to an acyl group as defined herein-above but wherein a sulfur atom replaces the oxygen atom of the carbonyl (oxo) moiety.

As used herein with respect to a substituting radical, and unless otherwise stated, the term “C_1-7 alkylene” means the divalent hydrocarbon radical corresponding to the above defined C_1-7 alkyl, such as methylene, bis(methylene), tris(methylene), tetramethylene, hexamethylene and the like.

As used herein with respect to a substituting radical, and unless otherwise stated, the term “C_3-10 cycloalkyl” means a mono- or polycyclic saturated hydrocarbon monovalent radical having from 3 to 10 carbon atoms, such as for instance cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl and the like, or a C_7-10 polycyclic saturated hydrocarbon monovalent radical having from 7 to 10 carbon atoms such as, for instance, norbornyl, fenchyl, trimethyltricycloheptyl or adamantyl.

As used herein with respect to a substituting radical, and unless otherwise stated, the term “C_3-10 cycloalkyl-alkyl” refers to an aliphatic saturated hydrocarbon monovalent radical (preferably a C_1-7 alkyl such as defined above) to which a C_3-10 cycloalkyl (such as defined above) is already linked such as, but not limited to, cyclohexylmethyl, cyclopentylmethyl and the like.

As used herein with respect to a substituting radical, and unless otherwise stated, the term “C_3-10 cycloalkylene” means the divalent hydrocarbon radical corresponding to the above defined C_3-10 cycloalkyl.

As used herein with respect to a substituting radical, and unless otherwise stated, the term “aryl” designate any mono- or polycyclic aromatic monovalent hydrocarbon radical having from 6 up to 30 carbon atoms such as but not limited to phenyl, naphthyl, anthracenyl, phenantracyl, fluoranthenyl, chrysenyl, pyrenyl, biphenylyl, terphenyl, picenyl, indenyl, biphenyl, indacenyl, benzocyclobutenyl, benzocyclooctenyl and the like, including fused benzo-C_4-β cycloalkyl radicals (the latter being as defined above) such as, for instance, indanyl, tetrahydronaphthyl, fluorenyl and the like, all of the said radicals being optionally substituted with one or more substituents independently selected from the group consisting of halogen, amino, trifluoromethyl, hydroxyl, sulfhydryl and nitro, such as for instance 4-fluorophenyl, 4-chlorophenyl, 3,4-dichlorophenyl, 4-cyanophenyl, 2,6-dichlorophenyl, 2-fluorophenyl, 3-chlorophenyl, 3,5-dichlorophenyl and the like.

As used herein, e.g. with respect to a substituting radical such as the combination of substituents in certain positions of the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine or purine ring together with the carbon atoms in the same positions of said ring, and unless otherwise stated, the term “homocyclic” means a mono- or polycyclic, saturated or mono-unsaturated or polyunsaturated hydrocarbon radical having from 4 up to 15 carbon atoms but including no heteroatom in the said ring; for instance said combination of substituents may form a C_2-6 alkylene radical, such as tetramethylene, which cyclizes with the carbon atoms in certain positions of the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine or purine ring.

As used herein with respect to a substituting radical (including the combination of substituents in certain positions of the thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine or purine ring together with the carbon atoms in the same positions of said ring), and unless otherwise stated, the term “heterocyclic” means a mono- or polycyclic, saturated or mono-unsaturated or polyunsaturated monovalent hydrocarbon radical having from 2 up to 15 carbon atoms and including one or more heteroatoms in one or more heterocyclic rings, each of said rings having from 3 to 10 atoms (and optionally further including one or more heteroatoms attached to one or more carbon atoms of said ring, for instance in the form of a carbonyl or thiocarbonyl or selenocarbonyl group, and/or to one or more heteroatoms of said ring, for instance in the form of a sulfone, sulfoxide, N-oxide, phosphate, phosphonate or selenium oxide group), each of said heteroatoms being independently selected from the group consisting of nitrogen, oxygen, sulfur, selenium and phosphorus, also including radicals wherein a heterocyclic ring is fused to one or more aromatic hydrocarbon rings for instance in the form of benzo-fused, dibenzo-fused and naphtho-fused heterocyclic radicals; within this definition are included heterocyclic radicals such as, but not limited to, diazepinyl, oxadiazinyl, thiadiazinyl, dithiazinyl, triazolonyl, diazepinonyl, triazepinyl, triazepinonyl, tetrazepinonyl, benzoquinolinyl, benzothiazinyl, benzothiazinonyl, benzoxa-thiinyl, benzodioxinyl, benzodithiinyl, benzoxazepinyl, benzothiazepinyl, benzodiazepine, benzodioxepinyl, benzodithiepinyl, berrzoxazocinyl, benzo-thiazocinyl, benzodiazocinyl, benzoxathiocinyl, benzodioxocinyl, benzotrioxepinyl, benzoxathiazepinyl, benzoxadiazepinyl, benzothia-diazepinyl, benzotriazepinyl, benzoxathiepinyl, benzotriazinonyl, benzoxazolinonyl, azetidinonyl, azaspiroundecyl, dithiaspirodecyl, selenazinyl, selenazolyl, selenophenyl, hypoxanthinyl, azahypo-xanthinyl, bipyrazinyl, bipyridinyl, oxazolidinyl, diselenopyrimidinyl, benzodioxocinyl, benzopyrenyl, benzopyranonyl, benzophenazinyl, benzoquinolizinyl, dibenzo-carbazolyl, dibenzoacridinyl, dibenzophenazinyl, dibenzothiepinyl, dibenzoxepinyl, dibenzopyranonyl, dibenzoquinoxalinyl, dibenzothiazepinyl, dibenzisoquinolinyl, tetraazaadamantyl, thiatetraazaadamantyl, oxauracil, oxazinyl, dibenzothiophenyl, dibenzofuranyl, oxazolinyl, oxazolonyl, azaindolyl, azolonyl, thiazolinyl, thiazolonyl, thiazolidinyl, thiazanyl, pyrimidonyl, thiopyrimidonyl, thiamorpholinyl, azlactonyl, naphtindazolyl, naphtindolyl, naphtothiazolyl, naphtothioxolyl, naphtoxindolyl, naphto-triazolyl, naphtopyranyl, oxabicycloheptyl, azabenzimidazolyl, azacycloheptyl, azacyclooctyl, azacyclononyl, azabicyclononyl, tetrahydrofuryl, tetrahydropyrarryl, tetrahydro-pyronyl, tetrahydroquinoleinyl, tetrahydrothienyl and dioxide thereof, dihydrothienyl dioxide, dioxindolyl, dioxinyl, dioxenyl, dioxazinyl, thioxanyl, thioxolyl; thiourazolyl, thiotriazolyl, thiopyranyl, thiopyronyl, coumarinyl, quinoleinyl, oxyquinoleinyl, quinuclidinyl, xanthinyl, dihydropyranyl, benzodihydrofuryl, benzothiopyronyl, benzothiopyranyl, benzoxazinyl, benzoxazolyl, benzodioxolyl, benzodioxanyl, benzothiadiazolyl, benzotriazinyl, benzothiazolyl, benzoxazolyl, phenothioxinyl, phenothiazolyl, phenothienyl (benzothiofuranyl), phenopyronyl, phenoxazolyl, pyridinyl, dihydropyridinyl, tetrahydropyridinyl, piperidinyl, morpholinyl, thiomorpholinyl, pyrazinyl, pyrimidinyl, pyridazinyl, triazinyl, tetrazinyl, triazolyl, benzotriazolyl, tetrazolyl, imidazolyl, pyrazolyl, thiazolyl, thiadiazolyl, isothiazolyl, oxazolyl, oxadiazolyl, pyrrolyl, furyl, dihydrofutyl, furoyl, hydantoinyl, dioxolanyl, dioxolyl, dithianyl, dithienyl, dithiinyl, thienyl, indolyl, indazolyl, benzofutyl, quinolyl, quinazolinyl, quinoxalinyl, carbazolyl, phenoxazinyl, phenothiazinyl, xanthenyl, purinyl, benzothienyl, naphtothienyl, thianthrenyl, pyranyl, pyronyl, benzopyronyl, isobenzofuranyl, chromenyl, phenoxathiinyl, indolizinyl, quinolizinyl, isoquinolyl, phthalazirryl, naphthiridinyl, cinnolinyl, pteridinyl, carbolinyl, acridinyl, perimidinyl, phenanthrolinyl, phenazinyl, phenothiazinyl, imidazolinyl, imidazolidinyl, benzimidazolyl, pyrazolinyl, pyrazolidinyl, pyrrolinyl, pyrrolidinyl, piperazinyl, uridinyl, thymidinyl, cytidinyl, azirinyl, aziridinyl, diazirinyl, diaziridinyl, oxiranyl, oxaziridinyl, dioxiranyl, thiiranyl, azetyl, dihydroazetyl, azetidinyl, oxetyl, oxetanyl, oxetanonyl, homopiperazinyl, homopiperidinyl, thietyl, thietanyl, diazabicyclooctyl, diazetyl, diaziridinonyl, diaziridinethionyl, chromanyl, chromanonyl, thiochromanyl, thiochromanonyl, thiochromenyl, benzofuranyl, benzisothiazolyl, benzocarbazolyl, benzochromonyl, benzisoalloxazinyl, benzocoumarinyl, thiocoumarinyl, pheno-metoxazinyl, phenoparoxazinyl, phentriazinyl, thiodiazinyl, thiodiazolyl, indoxyl, thioindoxyl, benzodiazinyl (e.g. phtalazinyl), phtalidyl, phtalimidinyl, phtalazonyl, alloxazinyl, dibenzopyronyl (i.e. xanthonyl), xanthionyl, isatyl, isopyrazolyl, isopyrazolonyl, urazolyl, urazinyl, uretinyl, uretidinyl, succinyl, succinimido, benzylsultimyl, benzylsultamyl and the like, including all possible isomeric forms thereof, wherein each carbon atom of said heterocyclic ring may furthermore be independently substituted with a substituent selected from the group consisting of halogen, nitro, C_1-7 alkyl (optionally containing one or more functions or radicals selected from the group consisting of carbonyl (oxo), alcohol (hydroxyl), ether (alkoxy), acetal, amino, imino, oximino, alkyloximino, amino-acid, cyano, carboxylic acid ester or amide, nitro, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, C_1-7 alkylamino, cycloalkylamino, alkenylamino, cycloalkenylamino, alkynylamino, arylamino, arylalkyl-amino, hydroxylalkylamino, mercaptoalkylamino, heterocyclic-substituted alkylamino, heterocyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, sulfonyl, sulfonamido and halogen), C_3-7 alkenyl, C_2-7 alkynyl, halo C_1-7 alkyl, C_3-10 cycloalkyl, aryl, arylalkyl, alkylaryl, alkylacyl, arylacyl, hydroxyl, amino, C_1-7 alkylamino, cycloalkylamino, alkenylamino, cycloalkenylamino, alkynylamino, arylamino, arylalkylamino, hydroxyalkylamino, mercaptoalkylamino, heterocyclic-substituted alkylamino, heterocyclic amino, heterocyclic-substituted arylamino, hydrazino, alkylhydrazino, phenylhydrazino, sulfhydryl, C_1-7 alkoxy, C_3-10 cycloalkoxy, aryloxy, arylalkyloxy, oxyheterocyclic, heterocyclic-substituted alkyloxy, thio C_1-7 alkyl, thio C_3-10 cycloalkyl, thioaryl, thioheterocyclic, arylalkylthio, heterocyclic-substituted alkylthio, formyl, hydroxylamino, cyano, carboxylic acid or esters or thioesters or amides thereof, tricarboxylic acid or esters or thioesters or amides thereof; depending upon the number of unsaturations in the 3 to 10 atoms ring, heterocyclic radicals may be sub-divided into heteroaromatic (or “heteroaryl”) radicals and non-aromatic heterocyclic radicals; when a heteroatom of said non-aromatic heterocyclic radical is nitrogen, the latter may be substituted with a substituent selected from the group consisting of C_1-7 alkyl, C_3-10 cycloalkyl, aryl, arylalkyl and alkylaryl.

As used herein with respect to a substituting radical, and unless otherwise stated, the terms “C_1-7 alkoxy”, “C_3-10 cycloalkoxy”, “aryloxy”, “arylalkyloxy”, “oxyheterocyclic”, “thio C_1-7 alkyl”, “thio C_3-10 cycloalkyl”, “arylthio”, “arylalkylthio” and “thioheterocyclic” refer to substituents wherein a carbon atom of a C_1-7 alkyl, respectively a C_3-10 cycloalkyl, aryl, arylalkyl or heterocyclic radical (each of them such as defined herein), is attached to an oxygen atom or a divalent sulfur atom through a single bond such as, but not limited to, methoxy, ethoxy, propoxy, butoxy, pentoxy, isopropoxy, sec-butoxy, tert-butoxy, isopentoxy, cyclopropyloxy, cyclobutyloxy, cyclopentyloxy, thiomethyl, thioethyl, thiopropyl, thiobutyl, thiopentyl, thiocyclopropyl, thiocyclobutyl, thiocyclopentyl, thiophenyl, phenyloxy, benzyloxy, mercaptobenzyl, cresoxy, and the like.

As used herein with respect to a substituting atom, and unless otherwise stated, the term “halogen” or “halo” means any atom selected from the group consisting of fluorine, chlorine, bromine and iodine.

As used herein with respect to a substituting radical, and unless otherwise stated, the term “halo C_1-7 alkyl” means a C_1-7 alkyl radical (such as above defined) in which one or more hydrogen atoms are independently replaced by one or more halogens (preferably fluorine, chlorine or bromine), such as but not limited to difluoromethyl, trifluoromethyl, trifluoroethyl, octafluoropentyl, dodecafluoroheptyl, dichloromethyl and the like.

As used herein with respect to a substituting radical, and unless otherwise stated, the terms “C_2-7 alkenyl” designate a straight and branched acyclic hydrocarbon monovalent radical having one or more ethylenic unsaturations and having from 2 to 7 carbon atoms such as, for example, vinyl, 1-propenyl, 2-propenyl (allyl), 1-butenyl, 2-butenyl, 2-pentenyl, 3-pentenyl, 3-methyl-2-butenyl, 3-hexenyl, 2-hexenyl, 2-heptenyl, 1,3-butadienyl, pentadienyl, hexadienyl, heptadienyl, heptatrienyl and the like, including all possible isomers thereof.

As used herein with respect to a substituting radical, and unless otherwise stated, the term “C_3-10 cycloalkenyl” means a monocyclic mono- or polyunsaturated hydrocarbon monovalent radical having from 3 to 8 carbon atoms, such as for instance cyclopropenyl, cyclobutenyl, cyclopentenyl, cyclopentadienyl, cyclohexenyl, cyclohexadienyl, cycloheptenyl, cyclohepta-dienyl, cycloheptatrienyl, cyclooctenyl, cyclooctadienyl and the like, or a C_7-10 polycyclic mono- or polyunsaturated hydrocarbon monovalent radical having from 7 to 10 carbon atoms such as dicyclopentadienyl, fenchenyl (including all isomers thereof, such as α-pinolenyl), bicyclo[2.2.1]hept-2-enyl, bicyclo[2.2.1]hepta-2,5-dienyl, cyclo-fenchenyl and the like.

As used herein with respect to a substituting radical, and unless otherwise stated, the term “C_2-7 alkynyl” defines straight and branched chain hydrocarbon radicals containing one or more triple bonds and optionally at least one double bond and having from 2 to 7 carbon atoms such as, for example, acetylenyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 2-pentynyl, 1-pentynyl, 3-methyl-2-butynyl, 3-hexynyl, 2-hexynyl, 1-penten-4-ynyl, 3-penten-1-ynyl, 1,3-hexadien-1-ynyl and the like.

As used herein with respect to a substituting radical, and unless otherwise stated, the terms “arylalkyl”, “arylalkenyl” and “heterocyclic-substituted alkyl” refer to an aliphatic saturated or ethylenically unsaturated hydrocarbon monovalent radical (preferably a C_1-7 alkyl or C_2-7 alkenyl radical such as defined above) onto which an aryl or heterocyclic radical (such as defined above) is already bonded via a carbon atom, and wherein the said aliphatic radical and/or the said aryl or heterocyclic radical may be optionally substituted with one or more substituents independently selected from the group consisting of halogen, amino, hydroxyl, sulfhydryl, C_1-7 alkyl, C_1-7 alkoxy, trifluoromethyl and nitro, such as but not limited to benzyl, 4-chlorobenzyl, 4-fluorobenzyl, 2-fluorobenzyl, 3,4-dichlorobenzyl, 2,6-dichlorobenzyl, 3-methylbenzyl, 4-methylbenzyl, 4-ter-butylbenzyl, phenylpropyl, 1-naphthylmethyl, phenylethyl, 1-amino-2-phenylethyl, 1-amino-2-[4-hydroxy-phenyl]ethyl, 1-amino-2-[indol-2-yl]ethyl, styryl, pyridylmethyl (including all isomers thereof), pyridylethyl, 2-(2-pyridyl)isopropyl, oxazolylbutyl, 2-thienylmethyl, pyrrolylethyl, morpholinylethyl, imidazol-1-yl-ethyl, benzodioxolylmethyl and 2-furylmethyl.

As used herein with respect to a substituting radical, and unless otherwise stated, the terms “alkylaryl” and “alkyl-substituted heterocyclic” refer to an aryl or, respectively, heterocyclic radical (such as defined above) onto which are bonded one or more aliphatic saturated or unsaturated hydrocarbon monovalent radicals, preferably one or more C_1-7 alkyl, C_2-7 alkenyl or C_3-10 cycloalkyl radicals as defined above such as, but not limited to, o-toluoyl, m-toluoyl, p-toluoyl, 2,3-xylyl, 2,4-xylyl, 3,4-xylyl, o-cumenyl, m-cumenyl, p-cumenyl, o-cymenyl, m-cymenyl, p-cymenyl, mesityl, ter-butylphenyl, lutidinyl (i.e. dimethylpyridyl), 2-methylaziridinyl, methyl-benzimidazolyl, methylbenzofuranyl, methylbenzothiazolyl, methylbenzotriazolyl, methylbenzoxazolyl and methylbenzselenazolyl.

As used herein with respect to a substituting radical, and unless otherwise stated, the term “alkoxyaryl” refers to an aryl radical (such as defined above) onto which is (are) bonded one or more C_1-7 alkoxy radicals as defined above, preferably one or more methoxy radicals, such as, but not limited to, 2-methoxyphenyl, 3-methoxyphenyl, 4-methoxyphenyl, 3,4-dimethoxyphenyl, 2,4,6-trimethoxyphenyl, methoxynaphtyl and the like.

As used herein with respect to a substituting radical, and unless otherwise stated, the terms “alkylamino”, “cycloalkylamino”, “alkenylamino”, “cyclo-alkenylamino”, “arylamino”, “arylalkylamino”, “heterocyclic-substituted alkylamino”, “heterocyclic-substituted arylamino”, “heterocyclic amino”, “hydroxy-alkylamino”, “mercaptoalkylamino” and “alkynylamino” mean that respectively one (thus monosubstituted amino) or even two (thus disubstituted amino) C_1-7 alkyl, C_3-10 cycloalkyl, C_2-7 alkenyl, C_3-10 cycloalkenyl, aryl, arylalkyl, heterocyclic-substituted alkyl, heterocyclic-substituted aryl, heterocyclic (provided in this case the nitrogen atom is attached to a carbon atom of the heterocyclic ring), mono- or polyhydroxy C_1-7 alkyl, mono- or polymercapto C_1-7 alkyl, or C_2-7 alkynyl radical(s) (each of them as defined herein, respectively, and including the presence of optional substituents independently selected from the group consisting of halogen, amino, hydroxyl, sulfhydryl, C_1-7 alkyl, C_1-7 alkoxy, trifluoromethyl and nitro) is/are attached to a nitrogen atom through a single bond such as, but not limited to, anilino, 2-bromoanilino, 4-bromoanilino, 2-chloroanilino, 3-chloroanilino, 4-chloroanilino, 3-chloro-4-methoxyanilino, 5-chloro-2-methoxyanilino, 2,3-dimethylanilino, 2,4-dimethylanilino, 2,5-dimethylanilino, 2,6-dimethylanilino, 3,4-dimethylanilino, 2-fluoroanilino, 3-fluoroanilino, 4-fluoroanilino, 3-fluoro-2-methoxyanilino, 3-fluoro-4-methoxyanilino, 2-fluoro-4-methylanilino, 2-fluoro-5-methylanilino, 3-fluoro-2-methylanilino, 3-fluoro-4-methylanilino, 4-fluoro-2-methylanilino, 5-fluoro-2-methylanilino, 2-iodoanilino, 3-iodoanilino, 4-iodoanilino, 2-methoxy-5-methylanilino, 4-methoxy-2-methylanilino, 5-methoxy-2-methylanilino, 2-ethoxyanilino, 3-ethoxy-anilino, 4-ethoxyanilino, benzylamino, 2-methoxybenzylamino, 3-methoxybenzylamino, 4-methoxybenzylamino, 2-fluorobenzylamino, 3-fluorobenzylamino, 4-fluoro-benzylamino, 2-chlorobenzylamino, 3-chlorobenzylamino, 4-chlorobenzylamino, 2-aminobenzylamino, diphenylmethylamino, α-naphthylamino, methylamino, dimethylamino, ethylamino, diethylamino, isopropylamino, propenylamino, n-butylamino, ter-butylamino, dibutylamino, 1,2-diaminopropyl, 1,3-diaminopropyl, 1,4-diaminobutyl, 1,5-diaminopentyl, 1,6-diaminohexyl, morpholinomethylamino, 4-morpholinoanilino, hydroxymethylamino, β-hydroxyethylamino and ethynylamino; this definition also includes mixed disubstituted amino radicals wherein the nitrogen atom is attached to two such radicals belonging to two different sub-sets of radicals, e.g. an alkyl radical and an alkenyl radical, or to two different radicals within the same subset of radicals, e.g. methylethylamino; among di-substituted amino radicals, symmetrically-substituted amino radicals are more easily accessible and thus usually preferred from a standpoint of ease of preparation.

As used herein with respect to a substituting radical, and unless otherwise stated, the terms “(thio)carboxylic acid-ester”, “(thio)carboxylic acid thioester” and “(thio)carboxylic acid amide” refer to radicals wherein the carboxyl or thiocarboxyl group is bonded to the hydrocarbonyl residue of an alcohol, a thiol, a polyol, a phenol, a thiophenol, a primary or secondary amine, a polyamine, an amino-alcohol or ammonia, the said hydrocarbonyl residue being selected from the group consisting of alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, aryl, arylalkyl, alkylaryl, alkylamino, cycloalkylamino, alkenylamino, cycloalkenylamino, arylamino, arylalkylamino, heterocyclic-substituted alkylamino, heterocyclic amino, heterocyclic-substituted arylamino, hydroxyalkylamino, mercapto-alkylamino or alkynylamino (such as above defined, respectively). As used herein with respect to a substituting radical, and unless otherwise stated, the term “amino-acid” refers to a radical derived from a molecule having the chemical formula H₂N—CHR—COOH₁ wherein R is the side group of atoms characterizing the amino-acid type; said molecule may be one of the 20 naturally-occurring amino-acids or any similar non naturally-occurring amino-acid.

As used herein and unless otherwise stated, the term “stereoisomer” refers to all possible different isomeric as well as conformational forms which the compounds of formula I, II, III, or IV may possess, in particular all possible stereochemical̂ and conformationally isomeric forms, all diastereomers, enantiomers and/or conformers of the basic molecular structure. Some compounds of the present invention may exist in different tautomeric forms, all of the latter being included within the scope of the present invention.

As used herein and unless otherwise stated, the term “enantiomer” means each individual optically active form of a compound of the invention, having an optical purity or enantiomeric excess (as determined by methods standard in the art) of at least 80% (i.e. at least 90% of one enantiomer and at most 10% of the other enantiomer), preferably at least 90% and more preferably at least 98%.

As used herein and unless otherwise stated, the term “solvate” includes any combination which may be formed by a thiazolo[5,4-d]pyrimidine, oxazolo[5,4-d]pyrimidine, thieno[2,3-d]pyrimidine or purine derivative of this invention with a suitable inorganic solvent (e.g. hydrates) or organic solvent, such as but not limited to alcohols, ketones, esters, ethers, nitriles and the like.

The following examples illustrate the present invention.

EXAMPLES

General

For all reactions, analytical grade solvents were used. All moisture-sensitive reactions were carried out in oven-dried glass-ware (135° C.). ¹H and ¹³C NMR spectra were recorded with a Bruker Advance 300 (¹H NMR: 300 MHz, ¹³C NMR: 75 MHz), using tetramethylsilane as internal standard for ¹H NMR spectra and DMSO-d₆ (39.5 ppm) or CDCl₃ (77.2 ppm) for ¹³C NMR spectra. Abbreviations used are: s=singlet, d=doublet, t=triplet, q=quartet, m=multiplet, br s=broad signal. Coupling constants are expressed in Hertz: Mass spectra are obtained with a Finnigan LCQ advantage Max (ion trap) mass spectrophotometer from Thermo Finnigan, San Jose, Calif., USA. Exact mass measurements are performed on a quadrupole time-of-flight mass spectrometer (Q-tof-2, Micromass, Manchester, UK) equipped with a standard electrospray-ionization (ESI) interface. Samples were infused in i-PrOH/H₂O (1:1) at 3 μl/min. Melting points are determined on a Barnstead IA 9200 apparatus and are uncorrected. Precoated aluminum sheets (Fluka Silica gel/TLC-cards, 254 nm) were used for TLC. Column chromatography was performed on ICN silica gel 63-200, 60 Å.

Example 1

Synthesis of diethyl 2-(4-fluorobenzamido)malonate

To a solution of diethyl aminomalonate hydrochloride (5.0 g, 23.6 mmol) in pyridine (7.64 ml, 94.5 mmol) and dimethylformamide (60 ml) was added p-fluorobenzoyl chloride (4.19 ml, 35.4 mmol). The reaction mixture was stirred at room temperature for 15 hours. After removing the solvents, the residue was redissolved in dichloromethane, washed with water, brine and dried over Na₂SO₄. After removing the solvents, the crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 30:1) to yield the title compound as a white solid (4.9 g, 70%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=9.37 (d, J=7.5 Hz, 1H, NH), 7.96-8.01 (m, 2H, PhH), 7.33 (t, J=8.8 Hz, 2H, PhH), 5.30 (d, J=7.5 Hz, 1H, CH), 4.12-4.28 (m, 4H, CH₂), 1.22 (t, J=7.1 Hz, 6H, CH₃) ppm.

HRMS: calcd for C₁₄H₁₇FNO₆ 298.1091, found 298.1092.

Example 2

Synthesis of diethyl 2-(2-(4-fluorophenyl)acetamido)malonate

To a solution of 4-fluorophenylacetic acid (4.5 g, 29.3 mmol) and 1-hydroxybenzotriazole (4.35 g, 32.2 mmol) in dichloromethane (140 ml) was added dicyclohexylcarbodiimide (6.65 g, 32.2 mmol). The reaction mixture was stirred at room temperature for 2 hours. The resulting solution was cooled to 0° C., and then a solution of diethyl aminomalonate hydrochloride (6.2 g, 29.3 mmol) in pyridine (4.5 ml, 29.3 mmol) and DMF (10 ml) was added. The temperature was allowed to rise to ambient temperature. After 1 hour, the reaction mixture was concentrated under reduced pressure, and the residue was partitioned between ethyl acetate and a 5% NaHCO₃ solution. The organic layer was washed with water, brine and dried over Na₂SO₄. After removing the solvents, the crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 50:1) to yield the title compound as a white solid (8.5 g, 93%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.26-7.29 (m, 2H, PhH), 7.05 (t, J=8.7 Hz, 2H, PhH), 6.44 (d, J=6.9 Hz, 1H, NH), 5.12 (d, J=6.9 Hz, 1H, CH), 4.16-4.32 (m, 4H, CH₂), 3.61 (s, 2H, CH₂Ph), 1.27 (t, J=7.1 Hz, 6H, CH₃) ppm.

HRMS: calcd for C₁₅H₁₉FNO₅ 312.1247, found 312.1247.

Example 3

Synthesis of dimethyl 2-(3-(4-fluorophenyl)propanamido)malonate

This compound was synthesized from dimethyl aminomalonate according to the procedure for the preparation of example 2 using 4-fluorophenylpropionic acid. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 50:1) to yield the title compound as a white solid (53%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.13-7.18 (m, 2H, PhH), 6.96 (t, J=8.7 Hz, 2H, PhH), 6.50 (d, J=6.7 Hz, 1H, NH), 5.19 (d, J=6.7 Hz, 1H, CH), 3.80 (s, 6H, CH₃), 2.95 (t, J=7.4 Hz, 2H, CH₂), 2.58 (t, J=7.4 Hz, 2H, CH₂) ppm.

HRMS: calcd for C₁₄H₁₇FNO₅ 298.10908, found 298.10827.

Example 4

Synthesis of dimethyl 2-(3-(4-fluorophenoxy)propanamido)malonate

This compound was synthesized from dimethyl aminomalonate according to the procedure for the preparation of example 2 using 3-(4-fluorophenoxy)propionic acid. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 50:1) to yield the title compound as a white solid (80%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.01 (br s, 1H, NH), 6.96 (t, J=9.1 Hz, 2H, PhH), 6.86-6.91 (m, 2H, PhH), 5.22 (d, J=6.8 Hz, 1H, CH), 4.23 (t, J=5.9 Hz, 2H, OCH₂), 3.82 (s, 6H, CH₃), 2.76 (t, J=5.9 Hz, 2H, CH₂) ppm.

HRMS: calcd for C₁₄H₁₇FNO₆ 314.10399, found 314.10315.

Example 5

Synthesis of N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-4-fluorobenzamide

Guanidine hydrochloride (1.35 g, 14.1 mmol) and diethyl 2-(4-fluorobenzamido)malonate (example 1, 3.0 g, 10.1 mmol) were added to a solution of sodium (0.46 g, 20.2 mmol) in ethanol (50 ml). The reaction mixture was refluxed for 3 hours. The reaction was cooled down to room temperature. The solid product was filtered off and washed with ethanol. The product was dissolved in a minimal volume of water and acidified to pH 4-5 with 5M HCl. The precipitate was collected, washed with water and dried to give the title compound as a white solid (1.41 g, 53%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=10.62 (s, 2H, OH), 8.81 (s, 1H, NH), 7.96-8.01 (m, 2H, PhH), 7.28 (t, J=8.8 Hz, 2H, PhH), 6.63 (s, 2H, NH₂) ppm.

HRMS: calcd for C₁₁H₁₀FN₄O₃ 265.07369, found 265.07148.

Example 6

Synthesis of N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-2-(4-fluorophenyl)acetamide

This compound was synthesized from example 2 (yield of 77%) using a similar procedure as for the preparation of example 5.

¹H NMR (300 MHz, DMSO, 25° C.): δ=10.61 (s, 2H, OH), 8.57 (s, 1H, NH), 7.32-7.36 (m, 2H, PhH), 7.10 (t, J=8.8 Hz, 2H, PhH), 6.57 (s, 2H, NH₂), 3.50 (s, 2H, CH₂) ppm.

HRMS: calcd for C₁₂H₁₂FN₄O₃ 279.08934, found 279.08846.

Example 7

Synthesis of N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-3-(4-fluorophenyl)propanamide

This compound was prepared from example 3 in a yield of 76%, according to the procedure for the synthesis of example 5.

¹H NMR (300 MHz, DMSO, 25° C.): δ=10.67 (s, 2H, OH), 8.41 (s, 1H, NH), 7.26-7.31 (m, 2H, PhH), 7.07 (t, J=8.8 Hz, 2H, PhH), 6.61 (s, 2H, NH₂), 2.82 (t, J=7.2 Hz, 2H, CH₂), 2.50 (t, J=7.2 Hz, 2H, CH₂) ppm.

HRMS: calcd for C₁₃H₁₄FN₄O₃293.10499, found 293.10424

Example 8

Synthesis of N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-3-(4-fluorophenoxy)propanamide

This compound was prepared from example 4 in a yield of 34%, according to the procedure for the synthesis of example 5.

¹H NMR (300 MHz, DMSO, 25° C.): b=10.65 (s, 2H, OH), 8.51 (s, 1H, NH), 7.10 (t, J=8.7 Hz, 2H, PhH), 6.90-6.97 (m, 2H, PhH), 6.55 (s, 2H, NH₂), 4.15 (t, J=6.2 Hz, 2H, OCH₂), 2.66 (t, J=6.2 Hz, 2H, CH₂) ppm.

MS 307 [M−H]

Example 9

Synthesis of N-(4,6-dihydroxy-2-methylpyrimidin-5-yl)-4-fluorobenzamide

Acetamidine hydrochloride (1.05 g, 11.1 mmol) and dimethyl 2-(4-fluorobenzamido)malonate (1.0 g, 3.71 mmol) were added to a solution of sodium (0.26 g, 11.1 mmol) in ethanol (37 ml). The reaction mixture was refluxed for 3 hours. Then, after cooling, the solid product was collected and washed with ethanol. The product was dissolved in a minimal volume of water and acidified to pH 4-5 with 5M HCl. The precipitate was collected, washed with water and dried to give the title compound as a white solid (0.77 g, 79%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=12.0 (s, 2H, OH), 9.09 (s, 1H, NH), 8.00 (br s, 2H, PhH), 7.30 (t, J=8.0 Hz, 2H, PhH), 2.28 (s, 3H, CH₃) ppm.

MS: 261.8 [M−H]

Example 10

Synthesis of N-(4,6-dihydroxy-2-mercaptopyrimidin-5-yl)-4-fluorobenzamide

Thiourea (0.72 g, 9.4 mmol) and diethyl 2-(4-fluorobenzamido)malonate (example 1, 2.0 g, 6.7 mmol) were added to a solution of sodium (0.16 g, 6.7 mmol) in ethanol (50 ml). The reaction mixture was refluxed for 3 hours and then cooled down to room temperature. The precipitate was filtered off and washed with ethanol. The product was dissolved in a minimal volume of water and acidified to pH 4-5 with 5M HCl. The precipitate was collected, washed with water and dried, furnishing the title compound as a white solid (0.78 g, 41%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=12.47 (s, 1H, SH), 12.32 (s, 2H, OH), 9.15 (s, 1H, NH), 8.00 (br s, 2H, PhH), 7.31 (t, J=6.8 Hz, 2H, PhH) ppm.

HRMS: calcd for C₁₁H₉FN₃O₃S 282.03487, found 282.03402.

Example 11

Synthesis of 5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidine-7-thiol

A solution of N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-4-fluorobenzamide (example 5, 1.3 g, 4.92 mmol) and phosphorus pentasulfide (2.19 g, 9.84 mmol) in dry pyridine (25 ml) was refluxed for 6 hours. The solvents were evaporated in vacuo. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 30:1), yielding the title compound as a yellow solid (1.28 g, 93%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=12.51 (s, 1H, SH), 7.96-8.01 (m, 2H, PhH), 7.38 (t, J=8.8 Hz, 2H, PhH), 7.10 (s, 2H, NH₂) ppm.

HRMS: calcd for C₁₁H₈FN₄S₂ 279.0174, found 279.0165.

Example 12

Synthesis of 5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was prepared from example 6 in a yield of 76%, according to the procedure for the synthesis of example 11.

¹H NMR (300 MHz, DMSO, 25° C.): δ=12.40 (s, 1H, SH), 7.37-7.42 (m, 2H, PhH), 7.19 (t, J=8.9 Hz, 2H, PhH), 6.98 (s, 2H, NH₂), 4.29 (s, 2H, CH₂) ppm.

HRMS: calcd for C₁₂H₁₀FN₄S₂ 293.03309, found 293.03260.

Example 13

Synthesis of 5-amino-2-(4-fluorophenethyl)-thiazolo[5,4-d]pyrimidine-7-thiol

This compound was prepared from example 7 in a yield of 76%, according to the procedure for the synthesis of example 11.

¹H NMR (300 MHz, DMSO, 25° C.): δ=12.39 (s, 1H, SH), 7.31-7.36 (m, 2H, PhH), 7.11 (t, J=8.8 Hz, 2H, PhH), 6.96 (s, 2H, NH₂), 3.23 (t, J=7.4, 2H, CH₂), 3.03 (t, J=7.4, 2H, CH₂) ppm.

HRMS: calcd for C₁₃H₁₂FN₄S₂ 307.04874, found 307.04792.

Example 14

Synthesis of 2-(4-fluorophenyl)-5-methyl-thiazolo[5,4-d]pyrimidine-7-thiol

This compound was prepared from example 9 in a yield of 73%, according to the procedure for the synthesis of example 11.

¹H NMR (300 MHz, DMSO, 25° C.): δ=14.09 (s, 1H, SH), 8.07-8.15 (m, 2H, PhH), 7.42 (t, J=8.8 Hz, 2H, PhH), 2.50 (s, 3H, CH₃) ppm.

MS 278.1 [M+H]⁺

Example 15

Synthesis of 2-(4-fluorophenyl)-thiazolo[5,4-d]pyrimidine-5,7-dithiol

This compound was prepared from example 10 in a yield of 57%, according to the procedure for the synthesis of example 11.

¹H NMR (300 MHz, DMSO, 25° C.): δ=13.62 (s, 1H, SH), 8.00-8.05 (m, 2H, PhH), 7.39 (t, J=8.7 Hz, 2H, PhH) ppm.

HRMS: calcd for C₁₁H₇FN₃S₃ 295.97861, found 295.97777.

Example 16

Synthesis of 2-(4-fluorophenyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine

To a solution of 5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidine-7-thiol (1.2 g, 4.31 mmol) and triethylamine (1.50 ml, 10.8 mmol) in DMSO (25 ml) was added iodomethane (0.54 ml, 8.62 mmol). The reaction mixture was stirred for 12 h under N₂ at 25° C. The mixture was poured into water and extracted with EtOAc. The organic extracts were dried over Na₂SO₄ and the solvents were removed under reduced pressure. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 80:1), yielding the title compound as a light yellow solid (0.76 g, 60%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.98-8.03 (m, 2H, PhH), 7.39 (t, J=8.8 Hz, 2H, PhH), 7.09 (s, 2H, NH₂), 2.59 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₂H₁₀FN₄S₂ 293.0331, found 293.0328.

Example 17

Synthesis of 2-(4-fluorobenzyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine

This compound was prepared from example 12 in a yield of 87%, according to the procedure for the synthesis of example 16.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.27-7.32 (m, 2H, PhH), 7.03 (t, J=8.6 Hz, 2H, PhH), 5.02 (s, 2H, NH₂), 4.31 (s, 2H, CH₂), 2.61 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₃H₁₂FN₄S₂ 307.0487, found 307.0482.

Example 18

Synthesis of 2-(4-fluorophenethyl)-7-methylthio-thiazolo[5,4-d]pyrimidin-5-amine

This compound was prepared from example 13 in a yield of 61%, according to the procedure for the synthesis of example 16.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.16-7.21 (m, 2H, PhH), 6.97 (t, J=8.7 Hz, 2H, PhH), 5.30 (s, 2H, NH₂), 3.30 (t, J=8.3, 2H, CH₂), 3.11 (t, J=8.3, 2H, CH₂) ppm.

HRMS: calcd for C₁₄H₁₄FN₄S₂ 321.06439, found 321.06362.

Example 19

Synthesis of 2-(2-(4-fluorophenoxy)ethyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine

A solution of N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-3-(4-fluorophenoxy)propanamide (2.5 g, 8.11 mmol) and phosphorus pentasulfide (3.60 g, 16.2 mmol) in dry pyridine (40 ml) was refluxed for 6 hours. After cooling down to room temperature, the precipitate was filtered off, washed with ethylacetate and dried. The crude 5-amino-2-(2-(4-fluorophenoxy)ethyl)-thiazolo[5,4-d]pyrimidine-7-thiol (2.0 g, 6.20 mmol) was redissolved in DMSO (30 ml). Triethylamine (0.85 ml, 6.12 mmol) and iodomethane (0.31 ml, 4.90 mmol) were added. The reaction mixture was stirred for 12 hours at room temperature under a nitrogen atmosphere. The mixture was poured into water and extracted with EtOAc. The combined organic layers were dried over Na₂SO₄ and the solvents were removed under reduced pressure. The crude residue was purified by chromatography on silica gel (CH₂Cl₂/MeOH 100:1), yielding the title compound as a light yellow solid (0.45 g, 15% over 2 steps).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=6.96 (t, J=9.1 Hz, 2H, PhH), 6.34-6.88 (m, 2H, PhH), 5.19 (s, 2H, NH₂), 4.31 (t, J=6.2, 2H, CH₂), 3.48 (t, J=6.2, 2H, CH₂) ppm.

HRMS: calcd for C₁₄H₁₄FN₄OS₂ 337.0593, found 337.05827.

Example 20

Synthesis of 2-(4-fluorophenyl)-5-methyl-7-methylthio-thiazolo[5,4-d]pyrimidine

This compound was prepared from example 14 in a yield of 95%, according to the procedure for the synthesis of example 16.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.07-8.11 (m, 2H, PhH), 7.19 (t, J=8.7 Hz, 2H, PhH), 2.78 (s, 3H, CH₃), 2.71 (s, 3H, CH₃) ppm.

Example 21

Synthesis of 2-(4-fluorophenyl)-7-methylsulfonyl-thiazolo[5,4-d]pyrimidin-5-amine

To a solution of 2-(4-fluorophenyl)-7-methylthio)-thiazolo[5,4-d]pyrimidin-5-amine (0.30 g, 1.03 mmol) in dichloromethane (5 ml) was added mCPBA (70%, 0.44 g, 2.57 mmol) at 0° C. The reaction mixture was stirred for 3 hours, whereby the reaction temperature was gradually increased from 0° C. to room temperature. The reaction mixture was diluted with CHCl₃ and was washed with a saturated NaHCO₃ solution, brine and dried over Na₂SO₄. After removing the solvents under reduced pressure, the residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 50:1), affording the title compound as a white solid (0.31 g, 93%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=8.11-8.16 (m, 2H, PhH), 7.12 (s, 2H, NH₂), 7.44 (t, J=8.8 Hz, 2H, PhH), 3.58 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₂H₁₀FN₄O₂S₂ 325.02292, found 325.02221.

Example 22

Synthesis of 2-(4-fluorobenzyl)-7-methylsulfonyl-thiazolo[5,4-d]pyrimidin-5-amine

This compound was prepared from example 17 in a yield of 71%, according to the procedure for the synthesis of example 21.

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.58 (s, 2H, NH₂), 7.43-7.48 (m, 2H, PhH), 7.22 (t, 6.8 Hz, 2H, PhH), 4.47 (s, 2H, CH₂), 3.51 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₃H₁₂FN₄O₂S₂ 339.03857, found 339.03804.

Example 23

Synthesis of 2-(4-fluorophenethyl)-7-methylsulfonyl-thiazolo[5,4-d]pyrimidin-5-amine

This compound was prepared from example 18 in a yield of 35%, according to the procedure for the synthesis of example 21.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.17-7.22 (m, 2H, PhH), 6.98 (t, J=8.6 Hz, 2H, PhH), 5.43 (s, 2H, NH₂), 3.43 (s, 3H, CH₃), 3.41 (t, J=7.9, 2H, CH₂), 3.17 (t, J=7.9, 2H, CH₂) ppm.

HRMS: calcd for C₁₄H₁₄FN₄O₂S₂ 353.05422, found 353.05363.

Example 24

Synthesis of 2-(2-(4-fluorophenoxy)ethyl)-7-methylsulfonyl-thiazolo[5,4-d]pyrimidin-5-amine

This compound was prepared from example 19 in a yield of 28%, according to the procedure for the synthesis of example 21.

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.57 (s, 2H, NH₂), 7.13 (t, J=8.9 Hz, 2H, PhH), 6.98-7.03 (m, 2H, PhH), 4.39 (t, J=5.9, 2H, CH₂), 3.55 (t, J=5.9, 2H, CH₂) 3.49 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₄H₁₄FN₄O₃S₂ 369.04913, found 369.04842.

Example 25

Synthesis of 2-(4-fluorophenyl)-7-(piperazin-1-yl)-thiazolo[5,4-d]pyrimidin-5-amine

To a solution of 2-(4-fluorophenyl)-7-methylsulfonyl-thiazolo[5,4-d]pyrimidin-5-amine (0.40 g, 1.23 mmol) and triethylamine (0.26 ml, 1.85 mmol) in dioxane (6 ml) was added piperazine (0.16 g, 1.85 mmol). The reaction mixture was heated at 60° C. for 5 hours. After cooling, the volatiles were removed under reduced pressure. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 15:1), furnishing the title compound as a light yellow solid (0.27 g, 67%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=9.09 (t, J=9.2 Hz, 1H, NH), 7.98-8.03 (m, 2H, PhH), 7.37 (t, J=8.8 Hz, 2H, PhH), 6.58 (s, 2H, NH₂), 4.45 (br s, 4H, N(CH₂)₂), 3.26 (br s, 4H, NH(CH₂)₂) ppm.

HRMS: calcd for C₁₅H₁₆FN₆S 331.11412, found 331.11290.

Example 26

Synthesis of 2-(4-fluorobenzyl)-7-(piperazin-1-yl)-thiazolo[5,4-d]pyrimidin-5-amine

This compound was prepared from example 22 in a yield of 50%, according to the procedure for the synthesis of example 25.

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.36-7.41 (m, 2H, PhH), 7.17 (t, J=8.9 Hz, 2H, PhH), 6.26 (s, 2H, NH₂), 4.27 (s, 2H, CH₂), 4.14 (br s, 4H, N(CH₂)₂), 2.85 (t, J=4.7 Hz, 4H, NH(CH₂)₂) ppm.

HRMS: calcd for C₁₆H₁₈FN₆S 345.12977, found 345.12883.

Example 27

Synthesis of 2-(4-fluorophenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was prepared from example 23 in a yield of 76%, according to the procedure for the synthesis of example 25.

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.26-7.31 (m, 2H, PhH), 7.08 (t, J=8.9 Hz, 2H, PhH), 6.19 (s, 2H, NH₂) 3.95 (br s, 4H, N(CH₂)₂), 3.23 (t, J=7.4, 2H, CH₂), 3.02 (t, J=7.4, 2H, CH₂), 2.74 (br s, 4H, HN(CH₂)₂) ppm.

HRMS: calcd for C₁₇H₂₀FN₆S 359.14542, found 359.14456.

Example 28

Synthesis of 7-(benzylthio)-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-5-amine

To a solution of 5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidine-7-thiol (50 mg, 0.18 mmol) and triethylamine (63 μl, 0.45 mmol) in DMSO (1 ml) was added benzyl bromide (43 μl, 0.36 mmol). The reaction mixture was stirred under N₂ at 25° C. for 3 hours. The mixture was poured onto water and extracted with EtOAc. The organic extracts were dried over Na₂SO₄ and the solvents were removed under reduced pressure. The residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 100:1) to yield the title compound as a light yellow solid (40 mg, 60%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.95-7.98 (m, 2H, PhH), 7.44 (d, J=6.6 Hz, 2H, PhH), 7.28-7.35 (m, 3H, PhH), 7.15 (t, J=8.6 Hz, 2H, PhH), 5.09 (s, 2H, NH₂), 4.53 (s, 2H, CH₂) ppm.

HRMS: calcd for C₁₈H₁₄FN₄S₂ 369.06439, found 369.06332.

Example 29

Synthesis of 2-(4-fluorophenyl)-7-(2-methoxyethoxy)-thiazolo[5,4-d]pyrimidin-5-amine

To a solution of Na (2.0 mg, 0.07 mmol) in 2-methoxyethanol (1 ml) was added 2-(4-fluorophenyl)-7-methylthio-thiazolo[5,4-d]pyrimidin-5-amine (40 mg, 0.14 mmol). The reaction mixture was heated at 80° C. for 20 hours. After cooling, the mixture was neutralized with 1N HCl and the solvent was removed under reduced pressure. The crude residue was extracted by ethyl acetate, brine and dried over Na₂SO₄. After removing the solvents under reduced pressure, the residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 100:1) to yield the title compound as a white solid (35 mg, 80%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.98-8.02 (m, 2H, PhH), 7.14 (t, J=8.5 Hz, 2H, PhH), 5.02 (s, 2H, NH₂), 4.70 (t, J=5.0 Hz, 2H, OCH₂), 3.85 (t, J=5.0 Hz, 2H, CH₂OCH₃), 3.46 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₄H₁₄FN₄O₂S 321.0821, found 321.0812.

Example 30

Synthesis of 7-ethoxy-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized according to the procedure for the synthesis of example 29 using ethanol. The crude residue was purified by chromatography on silica gel (ethyl acetate/heptane 1:10) to yield the title compound as a white solid (67%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.97-8.02 (m, 2H, PhH), 7.14 (t, J=8.6 Hz, 2H, PhH), 5.04 (s, 2H, NH₂), 4.61 (q, J=7.1 Hz, 2H, CH₂), 1.51 (t, J=7.1 Hz, 3H, CH₃) ppm.

HRMS: calcd for C₁₃H₁₂FN₄OS 291.0716, found 291.0717.

Example 31

Synthesis of 7-ethoxy-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from example 17 in a yield of 36%, according to the procedure for the synthesis of example 29.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.26-7.31 (m, 2H, PhH), 7.02 (t, J=9.0 Hz, 2H, PhH), 4.95 (s, 2H, NH₂), 4.58 (q, J=7.1 Hz, 2H, CH₂), 4.32 (s, 2H, CH₂), 1.50 (t, J=7.1 Hz, 3H, CH₃) ppm.

HRMS: calcd for C₁₄H₁₄FN₄OS 305.08723, found 305.08635.

Example 32

Synthesis of 2-(4-fluorophenyl)-N-7-(3-methoxypropyl)thiazolo[5,4-d]pyrimidine-5,7-diamine

To a solution of 2-(4-fluorophenyl)-7-methylsulfonyl-thiazolo[5,4-d]pyrimidin-5-amine (50 mg, 0.15 mmol) and triethylamine (32 μl, 0.23 mmol) in dioxane (1 ml) was added 3-methoxypropylamine (21 μl, 0.20 mmol). The reaction mixture was heated at 60° C. for 5 hours. After cooling, the volatiles were removed under reduced pressure. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 70:1), yielding the title compound as a white solid (32 mg, 62%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.89-7.94 (m, 2H, PhH), 7.13 (t, J=8.7 Hz, 2H, PhH), 6.37 (br s, 1H, NH), 4.84 (s, 2H, NH₂), 3.68 (q, J=6.3, 2H, NHCH₂), 3.56 (t, J=5.9 Hz, 2H, OCH₂), 3.41 (s, 3H, OCH₃), 1.97 (quint, J=6.3, 2H, CH₂) ppm.

HRMS: calcd for C₁₅H₁₇FN₅OS 334.1138, found 334.1121.

Example 33

Synthesis of 2-(4-fluorophenyl)-7-morpholino-thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from example 21 using morpholine, according to the procedure for the synthesis of example 32. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 50:1) to yield the title compound as a light yellow solid (77%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.86-7.90 (m, 2H, PhH), 7.14 (t, J=8.6 Hz, 2H, PhH), 4.77 (s, 2H, NH₂), 4.35 (br s, 4H, O(CH₂)₂), 3.85 (t, J=3.9 Hz, 4H, N(CH₂)₂) ppm.

HRMS: calcd for C₁₆H₁₆FN₆OS 332.0981, found 332.0975.

Example 34

Synthesis of 2-(4-fluorobenzyl)-7-morpholino-thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from example 22 in a yield of 67%, according to the procedure for the synthesis of example 32.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.24-7.28 (m, 2H, PhH), 7.02 (t, J=8.7 Hz, 2H, PhH), 4.69 (s, 2H, NH₂), 4.27 (br s, 4H, O(CH₂)₂), 4.21 (s, 2H, CH₂), 3.80 (t, J=5.0 Hz, 4H, N(CH₂)₂) ppm.

HRMS: calcd for C₁₆H₁₇FN₆OS 346.1138, found 346.1125.

Example 35

Synthesis of 2-(4-fluorophenyl)-7-(4-m-tolylpiperazin-1-yl)-thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized according to the procedure for the preparation of example 32, using 1-m-tolylpiperazine. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 40:1) to yield the title compound as a white solid (60%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.89-7.93 (m, 2H, PhH), 7.12-7.22 (m, 4H, PhH, tolyl H), 6.72-6.82 (m, 3H, tolyl H), 4.77 (s, 2H, NH₂), 4.51 (br s, 4H, N(CH₂)₂), 3.33 (t, J=5.0 Hz, 4H, N(CH₂)₂), 2.34 (s, 3H, CH₃) ppm.

HRMS: calcd for C₂₂H₂₂FN₆S 421.16107, found 421.15992.

Example 36

Synthesis of 2-(4-fluorophenyl)-7-(4-(thiazol-2-yl)piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized according to the procedure for example 32, using 1-(thiazol-2-yl)piperazine. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 50:1), yielding the pure title compound as a white solid (43%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.87-7.92 (m, 2H, PhH), 7.24 (d, J=3.6 Hz, 1H, thiazolyl H), 7.15 (t, J=8.6 Hz, 2H, PhH), 6.63 (d, J=3.6 Hz, 1H, thiazolyl H), 4.81 (s, 2H, NH₂), 4.50 (br s, 4H, N(CH₂)₂), 3.66 (t, J=5.3 Hz, 4H, N(CH₂)₂) ppm.

HRMS: calcd for C₁₈H₁₇FN₇S₂ 414.09709, found 414.09592.

Example 37

Synthesis of 2-(4-fluorophenyl)-7-(4-pentylpiperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized using a similar procedure as for the preparation of example 32, using 1-pentylpiperazine. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 50:1) to yield the title compound as a white solid (40%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.86-7.91 (m, 2H, PhH), 7.14 (t, J=8.6 Hz, 2H, PhH), 4.77 (s, 2H, NH₂), 4.38 (br s, 4H, N(CH₂)₂), 2.61 (br s, 4H, pentylN(CH₂)₂), 2.41 (t, J=7.8 Hz, 2H, NCH₂CH₂CH₂CH₂CH₃), 2.00 (br s, 2H, NCH₂CH₂CH₂CH₂CH₃), 1.56 (quint, J=6.7 Hz, 2H, NCH₂CH₂CH₂CH₂CH₃), 1.28-1.34 (m, 2H, NCH₂CH₂CH₂CH₂CH₃), 0.91 (t, J=6.5 Hz, 3H, NCH₂CH₂CH₂CH₂CH₃) ppm.

HRMS: calcd for C₂₀H₂₆FN₆S 401.19237, found 401.19102.

Example 38

Synthesis of 2-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-1-morpholinoethanone

This compound was synthesized according to the procedure for the synthesis of example 32, using 1-morpholino-2-(piperazin-1-yl)ethanone. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 60:1), affording the title compound as a light yellow solid (48%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.85-7.89 (m, 2H, PhH), 7.13 (t, J=8.4 Hz, 2H, PhH), 4.75 (s, 2H, NH₂), 4.37 (br s, 4H, N(CH₂)₂), 3.71 (br s, 4H, morpholinyl H), 3.66 (br s, 4H, morpholinyl H), 3.25 (S, 2H, CH₂), 2.67 (t, J=4.9 Hz, 4H, CH₂N(CH₂)₂) ppm.

HRMS: calcd for C₂₁H₂₅FN₇O₂S 458.17745, found 458.17603.

Example 39

Synthesis of 7-(4-benzylpiperazin-1-yl)-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized according to the procedure for the preparation of example 32, using 1-benzylpiperazine. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 60:1) to yield the title compound as a white solid (81%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.84-7.88 (m, 2H, PhH), 7.26-7.37 (m, 5H, PhH), 7.12 (t, J=8.4 Hz, 2H, PhH), 4.73 (s, 2H, NH₂), 4.36 (br s, 4H, N(CH₂)₂), 3.57 (s, 2H, CH₂), 2.59 (t, J=4.7 Hz, 4H, CH₂N(CH₂)₂) ppm.

HRMS: calcd for C₂₂H₂₂FN₆S 421.16107, found 421.15986.

Example 40

Synthesis of benzyl-4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazine-1-carboxylate

To a solution of 2-(4-fluorophenyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine (50 mg, 0.15 mmol) and pyridine (18 μl, 0.23 mmol) in DMF (1 ml) was added benzyl chloroformate (24 μl, 0.17 mmol). The reaction mixture was stirred for 3 hours at room temperature. The reaction mixture was quenched with water, extracted with EtOAc, brine and dried over Na₂SO₄. After removing the solvents, the crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 100:1) to yield the title compound as a white solid (54 mg, 77%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.85-7.89 (m, 2H, PhH), 7.40-7.35 (m, 5H, PhH), 7.13 (t, J=8.6 Hz, 2H, PhH), 5.19 (s, 2H, CH₂), 4.82 (s, 2H, NH₂), 4.34 (br s, 4H, N(CH₂)₂), 3.66 (br s, 4H, CON(CH₂)₂) ppm.

HRMS: calcd for C₂₃H₂₂FN₆O₂S 465.15090, found 465.15005.

Example 41

Synthesis of 2-(4-fluorophenyl)-7-(4-(phenylsulfonyl)piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine

To a solution of 2-(4-fluorophenyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine (50 mg, 0.15 mmol) and pyridine (18 μl, 0.23 mmol) in DMF (1 ml) was added benzenesulfonyl chloride (21 μl, 0.17 mmol). The reaction mixture was stirred for 3 hours at room temperature. The reaction was quenched with water and extracted with EtOAc. The combined organic layers were dried over Na₂SO₄. After removing the solvents, the crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 80:1) to yield the title compound as a white solid (32 mg, 45%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.94-7.98 (m, 2H, PhH), 7.64-7.79 (m, 5H, PhH), 7.35 (t, J=8.6 Hz, 2H, PhH), 6.48 (s, 2H, NH₂), 4.35 (br s, 4H, N(CH₂)₂), 3.06 (br s, 4H, S—N(CH₂)₂) ppm.

HRMS: calcd for C₂₁H₂₀FN₆O₂S₂ 471.10732, found 471.10694.

Example 42

Synthesis of 4-(5-amino-2-(4-fluorophenyl)-thiazolo[5,4-d]pyrimidin-7-yl)-N-p-tolylpiperazine-1-carboxamide

To a solution of 2-(4-fluorophenyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine (50 mg, 0.15 mmol) in DMF (1 ml) was added p-tolyl isocyanate (21 μl, 0.17 mmol) in DMF (0.3 ml). The reaction mixture was stirred for 2 hours at room temperature. The reaction was quenched with water and extracted with EtOAc. The combined organic layers were dried over Na₂SO₄. After removing the solvents in vacuo, the crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 100:1) to yield the title compound as a white solid (31 mg, 44%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.86-7.91 (m, 2H, PhH), 7.26 (d, J=1.6 Hz, 2H, tolyl H), 7.10-7.23 (m, 4H, PhH, tolyl H), 6.34 (s, 1H, NH), 4.81 (s, 2H, NH₂), 4.42 (br s, 4H, N(CH₂)₂), 3.28 (t, J=5.3 Hz, 4H, CON(CH₂)₂), 2.31 (s, 3H, CH₃) ppm.

HRMS: calcd for C₂₃H₂₃FN₇OS 464.1669, found 464.1671.

Example 43

Synthesis of 4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide

This compound was prepared according to the procedure for the synthesis of example 42, using m-tolylisocyanate in a yield of 57%.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.86-7.91 (m, 2H, PhH), 7.25 (s, 1H, tolyl H), 7.12-7.22 (m, 4H, PhH, tolyl H), 6.88 (d, J=7.2 Hz, 1H, tolyl H), 6.41 (s, 1H, NH), 4.84 (s, 2H, NH₂), 4.42 (br s, 4H, N(CH₂)₂), 3.68 (t, J=5.3 Hz, 4H, CON(CH₂)₂), 2.33 (s, 3H, CH₃) ppm.

HRMS: calcd for C₂₃H₂₃FN₇OS 464.1669, found 464.1673.

Example 44

Synthesis of 4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide

This compound was prepared from example 26 in a yield of 72%, according to the procedure for the synthesis of example 42.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.06-7.29 (m, 5H, PhH, tolyl H), 7.04 (d, J=4.7 Hz, 2H, PhH), 6.89 (d, J=6.2 Hz, 1H, tolyl H), 6.30 (s, 1H, NH), 4.71 (s, 2H, NH₂), 4.34 (br s, 4H, N(CH₂)₂), 4.23 (s, 2H, CH₂), 3.61-3.65 (m, 4H, CON(CH₂)₂), 2.34 (s, 3H, CH₃) ppm.

HRMS: calcd for C₂₄H₂₅FN₇OS 478.1825, found 478.1823.

Example 45

Synthesis of 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone

To a solution of 2-(4-fluorophenyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine (40 mg, 0.12 mmol) and pyridine (15 μl, 0.18 mmol) in DMF (1 ml) was added 4-chlorophenoxyacetyl chloride (27 mg, 0.13 mmol). The reaction mixture was stirred for 2 hours at room temperature. The reaction mixture was quenched with water, extracted with EtOAc, brine and was dried over Na₂SO₄. After removing the solvents, the crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 100:1) to yield the title compound as a white solid (32 mg, 53%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.86-7.91 (m, 2H, PhH), 7.26 (d, J=9.0 Hz, 2H, tolyl H), 7.15 (t, J=8.4 Hz, 2H, PhH), 6.93 (d, J=9.0 Hz, 2H, tolyl H), 4.81 (s, 2H, NH₂), 4.75 (s, 2H, CH₂), 4.32 (br s, 4H, N(CH₂)₂), 3.75 (quint, J=5.0 Hz, 4H, CON(CH₂)₂) ppm.

HRMS: calcd for C₂₃H₂₁ClFN₆O₂S 499.1119, found 499.1130.

Example 46

Synthesis of 1-(4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone

This compound was prepared from example 26 in a yield of 31%, according to the procedure for the synthesis of example 45.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.23-7.28 (m, 4H, PhH), 7.02 (t, J=8.7 Hz, 2H, PhH), 6.92 (d, J=9.1 Hz, 2H, PhH), 4.74 (s, 2H, OCH₂), 4.71 (s, 2H, NH₂), 4.23-4.28 (br s, 4H, N(CH₂)₂), 4.22 (s, 2H, CH₂), 3.67-3.75 (m, 4H, CON(CH₂)₂) ppm.

HRMS: calcd for C₂₄H₂₃ClFN₆O₂S 513.12758, found 513.12732.

Example 47

Synthesis of 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorophenyl)-5-methylthiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone

To a solution of 7-chloro-2-(4-fluorophenyl)-5-methylthiazolo[5,4-d]pyrimidine (30 mg, 0.11 mmol) and triethylamine (22 μl, 0.16 mmol) in dioxane (1 ml) was added 2-(4-chlorophenoxy)-1-(piperazin-1-yl)ethanone (38 mg, 0.16 mmol). The reaction mixture was heated at 70° C. for 3 hours. After cooling, the volatiles were removed under reduced pressure. The crude residue was purified by chromatography on silica gel (CH₂Cl₂/MeOH 70:1) to yield the title compound as a white solid (40 mg, 75%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.93-7.97 (m, 2H, PhH), 7.26 (d, J=9.1 Hz, 2H, tolyl H), 7.17 (t, J=8.7 Hz, 2H, PhH), 6.93 (d, J=9.1 Hz, 2H, tolyl H), 4.76 (s, 2H, CH₂), 4.42 (br s, 4H, N(CH₂)₂), 3.79 (br s, 4H, CON(CH₂)₂) ppm.

HRMS: calcd for C₂₄H₂₂ClFN₅O₂S 498.11668, found 498.11541.

Example 48

Synthesis of 1-(4-(5-amino-2-(2-(4-fluorophenoxy)ethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone

This compound was prepared from example 24 in a yield of 72%, according to the procedure for the synthesis of example 47.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.25 (d, J=5.3 Hz, 2H, PhH), 6.83-7.00 (m, 6H, PhH), 4.72 (s, 2H, CH₂), 4.31 (t, J=6.2 Hz, 2H, CH₂), 4.23 (br s, 4H, NCH₂), 3.71 (br s, 2H, CONCH₂), 3.65 (br s, 2H, CONCH₂), 3.40 (t, J=6.2, 2H, CH₂) ppm.

HRMS: calcd for C₂₅H₂₅ClFN₆O₃S 543.13814, found 543.13690.

Example 49

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)-thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone

To a solution of 2-(4-fluorophenethyl)-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine (50 mg, 0.14 mmol) and triethylamine (30 μl, 0.21 mmol) in dioxane (1 ml) was added 2-(4-chlorophenoxy)-1-(piperazin-1-yl)ethanone (51 mg, 0.21 mmol). The reaction mixture was heated at 70° C. for 3 hours. After cooling, the volatiles were removed under reduced pressure. The crude residue was purified by chromatography on silica gel (CH₂Cl₂/MeOH 70:1) to yield the title compound as a light yellow solid (64 mg, 85%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.26 (d, J=8.9 Hz, 2H, PhH), 7.13-7.18 (m, 2H, PhH), 6.68 (d, J=8.9, 2H, PhH), 6.93 (t, J=9.1 Hz, 2H, PhH), 4.73 (br s, 4H, NH₂, OCH₂), 4.23 (br s, 4H, N(CH₂)₂), 3.71 (br s, 2H, CONCH₂), 3.70 (br s, 2H, CONCH₂), 3.23 (t, J=7.0, 2H, CH₂), 3.07 (t, J=7.0, 2H, CH₂) ppm.

HRMS: calcd for C₂₅H₂₅ClFN₆O₂S 527.14323, found 527.14215.

Example 50

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone

To a solution of 2-(4-fluorophenethyl)-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine (40 mg, 0.11 mmol) and 4-methoxyphenoxyacetic acid (30 mg, 0.17 mmol) in DMF (2 ml) was added TBTU (N,N,N′,N′-tetramethyl-O-(benzotriazol-1-yl)uronium tetrafluoroborate, 54 mg, 0.17 mmol), followed by DIPEA (29 μl, 0.17 mmol. The reaction mixture was stirred at room temperature for 3 hours. The mixture was diluted with water and extracted with dichloromethane. The combined organic layers were washed with brine and dried over Na₂SO₄. After removing the solvents under reduced pressure, the crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 40:1), yielding the title compound as a white solid (40 mg, 69%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.27-7.32 (m, 2H, PhH), 7.09 (t, J=8.9 Hz, 2H, PhH), 6.84-6.91 (m, 4H, PhH), 6.31 (br s, 2H, NH₂), 4.79 (s, 2H, CH₂), 4.22 (br s, 2H, NCH₂), 4.10 (br s, 2H, NCH₂), 3.69 (s, 3H, CH₃), 3.56 (br s, 4H, CON(CH₂), 3.25 (t, J=7.4, 2H, CH₂), 3.04 (t, J=7.4, 2H, CH₂) ppm.

HRMS: calcd for C₂₆H₂₈FN₆O₃S 523.19276, found 523.19218.

Example 51

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-fluorophenoxy)ethanone

This compound was prepared from example 27 using 4-fluorophenoxyacetic acid in a yield of 56%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.27-7.32 (m, 2H, PhH), 7.12 (t, J=8.9 Hz, 2H, PhH), 7.09 (t, J=8.6 Hz, 2H, PhH), 6.94-6.98 (m, 2H, PhH), 6.31 (br s, 2H, NH₂), 4.87 (s, 2H, CH₂), 4.23 (br s, 2H, NCH₂), 4.10 (br s, 2H, NCH₂), 3.56 (br s, 4H, CON(CH₂)₂), 3.25 (t, J=7.3, 2H, CH₂), 3.05 (t, J=7.3, 2H, CH₂) ppm.

HRMS: calcd for C₂₅H₂₅F₂N₆O₂S 511.17278, found 511.17170.

Example 52

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-O-2-(4-bromophenoxy)ethanone

This compound was prepared from example 27 using 4-bromophenoxyacetic acid in a yield of 47%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.44 (d, J=8.9 Hz, 2H, PhH), 7.27-7.32 (m, 2H, PhH), 7.09 (t, J=8.9 Hz, 2H, PhH), 6.92 (d, J=8.9 Hz, 2H, PhH), 6.31 (br s, 2H, NH₂), 4.91 (s, 2H, CH₂), 4.24 (br s, 2H, NCH₂), 4.10 (br s, 2H, NCH₂), 3.55 (br s, 4H, CON(CH₂)₂), 3.25 (t, J=7.4, 2H, CH₂), 3.04 (t, J=7.4, 2H, CH₂) ppm.

Example 53

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(m-tolyloxy)ethanone

This compound was prepared from example 27 using 3-methylphenoxyacetic acid in a yield of 44%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, DMSO, 25° C.): δ 7.28-7.32 (m, 2H, PhH), 7.16 (t, J=7.7 Hz, 1H, PhH), 7.09 (t, J=8.9 Hz, 2H, PhH), 6.73-6.78 (m, 3H, PhH), 6.31 (br s, 2H, NH₂), 4.84 (s, 2H, CH₂), 4.24 (br s, 2H, NCH₂), 4.10 (br s, 2H, NCH₂), 3.57 (br s, 4H, CON(CH₂)₂), 3.25 (t, J=7.4, 2H, CH₂), 3.05 (t, J=7.4, 2H, CH₂), 2.27 (s, 3H, CH₃) ppm.

HRMS: calcd for C₂₆H₂₈FN₆O₂S 507.19785, found 507.19725.

Example 54

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(2,4-dichlorophenoxy)ethanone

This compound was prepared from example 27 using 2,4-dichlorophenoxyacetic acid in a yield of 43%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.58 (d, J=2.6 Hz, 1H, PhH), 7.28-7.37 (m, 3H, PhH), 7.07-7.12 (m, 3H, PhH), 6.32 (br s, 2H, NH₂), 5.07 (s, 2H, CH₂), 4.25 (br s, 2H, NCH₂), 4.11 (br s, 2H, NCH₂), 3.56 (br s, 4H, CON(CH₂), 3.25 (t, J=7.5, 2H, CH₂), 3.04 (t, J=7.5, 2H, CH₂) ppm.

HRMS: calcd for C₂₅H²⁴Cl₂FN₆O₂S 561.10425, found 561.10335.

Example 55

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-3-(4-fluorophenoxy)propan-1-one

This compound was prepared from example 27 using 3-(4-fluorophenoxy)propionic acid in a yield of 43%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.27-7.33 (m, 2H, PhH), 7.06-7.14 (m, 4H, PhH), 6.92-6.97 (m, 2H, PhH), 6.30 (br s, 2H, NH₂), 4.19 (t, J=5.8 Hz, 2H, OCH₂), 4.17 (br s, 2H, NCH₂), 4.09 (br s, 2H, NCH₂), 3.59 (br s, 4H, CON(CH₂)₂), 3.25 (t, J=7.4, 2H, CH₂), 3.05 (t, J=7.4, 2H, CH₂), 2.86 (t, J=5.8, 2H, CH₂) ppm.

Example 56

Synthesis of 2-(4-fluorophenyl)-5-methyl-thiazolo[5,4-d]pyrimidin-7(6H)-one

To a solution of 2-(4-fluorophenyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine (0.15 g, 0.51 mmol) in dichloromethane (3 ml) was added mCPBA (70%, 0.32 g, 1.29 mmol) at 0° C. The temperature was gradually raised from 0° C. to room temperature and the reaction was stirred for another 3 hours. The reaction mixture was diluted with CHCl₃ and washed with a saturated NaHCO₃ solution, brine and dried over Na₂SO₄. After removing the solvents under reduced pressure, the residue was purified by chromatography on silica gel (CH₂Cl₂/MeOH 50:1) to yield the title compound as a white solid (0.10 g, 75%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=12.80 (s, 1H, NH), 8.03-8.08 (m, 2H, PhH), 7.40 (t, J=8.8 Hz, 2H, PhH), 2.41 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₂H₉FN₃OS 262.04504, found 262.04433.

Example 57

Synthesis of 7-chloro-2-(4-fluorophenyl)-5-methyl-thiazolo[5,4-d]pyrimidine

To a solution of 2-(4-fluorophenyl)-5-methyl-thiazolo[5,4-d]pyrimidin-7(6H)-one (0.40 g, 1.23 mmol) in POCl₃ was added diisopropylethylamine (0.13 ml, 0.77 mmol). The reaction mixture was stirred under N₂ at 90° C. for 3.5 hours. After cooling down to room temperature, the reaction mixture was poured into ice-water and the aqueous phase was extracted with diethyl ether. The combined organic layers were washed with a saturated NaHCO₃ solution and brine, dried over Na₂SO₄ and concentrated under reduced pressure. The crude residue was purified by chromatography on silica gel (hexane/EtOAc 10:1) to yield the title compound as a white solid (42.8 mg, 40%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.09-8.14 (m, 2H, PhH), 7.22 (t, J=8.5 Hz, 2H, PhH), 2.83 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₂H₈ClFN₃S 280.01115, found 280.01063.

Example 58

Synthesis of tert-butyl 4-(2-(4-chlorophenoxy)acetyl)piperazine-1-carboxylate

To a solution of tert-butyl piperazine-1-carboxylate (0.30 g, 0.16 mmol) and triethylamine (0.34 ml, 2.42 mmol) in dichloromethane (8 ml) was added p-chlorophenoxyacetyl chloride (0.36 mg, 1.77 mmol). The reaction mixture was stirred at room temperature overnight. The mixture was diluted with dichloromethane and washed with water, brine and dried over Na₂SO₄. After removing the solvents, the crude residue was purified by chromatography on silica gel (CH₂Cl₂/MeOH 80:1) to yield the title compound as a white solid (0.57 g, 100%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.25 (d, J=8.9 Hz, 2H, PhH), 6.88 (d, J=8.9 Hz, 2H, PhH), 4.68 (s, 2H, CH₂), 3.57 (br s, 4H, CON(CH₂)₂), 3.41 (br s, 4H, CON(CH₂)₂), 1.46 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₇H₂₄ClN₂O₄ 355.14246, found 355.14167.

Example 59

Synthesis of ethyl 4-(m-tolylcarbamoyl)piperazine-1-carboxylate

To a solution of ethyl piperazine-1-carboxylate (1.0 g, 6.32 mmol) in dichloromethane (30 ml) was added m-tolylisocyanate (0.90 mg, 6.95 mmol). The reaction mixture was stirred at room temperature for 2 hours. The mixture was diluted with dichloromethane and washed with water, brine and dried over Na₂SO₄. After removing the solvents, the residue was purified by chromatography on silica gel (CH₂Cl₂/MeOH 50:1) to yield the title compound as a white solid (1.6 g, 87%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.18 (s, 1H, PhH), 7.10-7.15 (m, 2H, PhH), 6.83 (d, J=6.4 Hz, 1H, PhH), 4.14 (q, J=7.1 Hz, 2H, OCH₂CH₃), 3.42 (br s, 8H, N(CH₂)₂), 2.27 (s, 3H, CH₃), 1.26 (t, J=7.1 Hz, 3H, OCH₂CH₃) ppm.

MS 289.7 [M−H]

Example 60

Synthesis of 2-(4-chlorophenoxy)-1-(piperazin-1-yl)ethanone

A suspension of tert-butyl 4-(2-(4-chlorophenoxy)acetyl)piperazine-1-carboxylate (example 58, 0.58 g, 0.16 mmol) in dichloromethane (8 ml) was treated dropwise at room temperature with TFA until the solid completely dissolved. The reaction mixture was stirred under nitrogen at room temperature overnight. The volatiles were evaporated to dryness, diluted with water and the solid was collected by filtration. The solid was washed with water and dried to yield the title compound as a white solid (0.30 g, 72%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=9.02 (s, 1H, NH), 7.32 (d, J=8.8 Hz, 2H, PhH), 6.96 (d, J=8.8 Hz, 2H, PhH), 4.90 (s, 2H, CH₂), 3.65 (br s, 4H, CON(CH₂)), 3.18 (br s, 2H, NCH₂), 3.10 (br s, 2H, NCH₂) ppm.

HRMS: calcd for C₁₂H₁₆ClN₂O₂ 255.09003, found 255.08913.

Example 61

Synthesis of N-m-tolylpiperazine-1-carboxamide

A suspension of ethyl 4-(m-tolylcarbamoyl)piperazine-1-carboxylate (example 59, 1.5 g, 5.15 mmol) in dichloromethane (25 ml) was treated dropwise at room temperature with iodotrimethylsilane (1.6 ml, 11.3 mmol). The reaction mixture was stirred under nitrogen at room temperature overnight. The volatiles were evaporated to dryness, diluted with methanol and the solid was filtered off. The solid was washed with methanol and dichloromethane and dried under vacuum to yield the title compound as a yellow solid (1.1 g, 100%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=8.62 (s, 1H, NH), 7.29 (s, 1H, PhH), 7.27 (d, J=7.3 Hz, 1H, PhH), 7.13 (t, J=7.3 Hz, 1H, PhH), 6.79 (d, J=7.3 Hz, 1H PhH), 3.65 (br s, 4H, CON(CH₂)), 3.17 (br s, 4H, N(CH₂)₂), 2.26 (s, 3H, CH₃) ppm.

MS 227.8 [M−H]

Example 62

Synthesis of 2-(1-(4-fluorophenyl)ethyl)-7-methylthio-thiazolo[6,4-d]pyrimidin-5-amine

To a solution of 2-(4-fluorobenzyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine (0.4 g, 1.31 mmol) and 2N NaOH (0.65 ml, 1.31 mmol) in DMSO (7 ml) was added iodomethane (81 μl, 1.31 mmol). The reaction mixture was stirred at room temperature for 2 hours. The mixture was poured into water and extracted with ethyl acetate, brine and dried over Na₂SO₄. After removing the solvents under reduced pressure, the residue was purified by chromatography on silica gel (hexane/EtOAc 5:1) yielding the title compound as a white solid (0.29 g, 69%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.31 (br s, 2H, PhH), 7.02 (br s, 2H, PhH), 5.16 (s, 2H, NH₂), 4.47 (br s, 1H, CH), 2.58 (s, 3H, CH₃), 1.76 (d, J=6.6 Hz, 3H, CHCH₃) ppm.

HRMS: calcd for C₁₄H₁₄FN₄S₂ 321.06439, found 321.06377.

Example 63

Synthesis of 2-(1-(4-fluorophenyl)-2-phenylethyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized according to the procedure for the preparation of example 62, using benzyl bromide. The crude residue was purified by flash chromatography on silica gel (hexane/EtOAc 5:1) to yield the title compound as a white solid (67%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.13-7.25 (m, 5H, PhH), 7.07 (d, J=6.8 Hz, 2H, PhH), 6.96 (t, J=8.5 Hz, 2H, PhH), 5.05 (s, 2H, NH₂), 4.52 (t, J=7.8 Hz, 1H, CH), 3.74 (dd, J=13.8, 7.8 Hz, 1H, benzylH), 3.30 (dd, J=13.8, 7.8 Hz, 1H, benzylH), 2.59 (s, 3H, CH₃) ppm.

HRMS: calcd for C₂₀H₁₈FN₄S₂ 397.09569, found 397.09495.

Example 64

Synthesis of 2-(1-(4-fluorophenyl)ethyl)-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from example 62 according to the procedure for the preparation of example 21. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 100:1) to yield the title compound as a white solid (77%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.35-7.30 (m, 2H, PhH), 7.05 (t, J=8.6 Hz, 2H, PhH), 5.49 (s, 2H, NH₂), 4.54 (q, J=7.1, 1H, CH), 3.49 (s, 3H, CH₃), 1.83 (d, J=7.1 Hz, 3H, CHCH₃) ppm.

HRMS: calcd for C₁₄H₁₄FN₄O₂S₂ 353.05422, found 353.05356.

Example 65

Synthesis of 2-(1-(4-fluorophenyl)-2-phenylethyl)-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from example 63 according to the procedure for the preparation of example 21. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 100:1) to yield the title compound as a white solid (85%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.59 (s, 2H, NH₂), 7.44-7.49 (m, 2H, PhH), 7.11-7.24 (m, 7H, PhH), 4.96 (t, J=7.8 Hz, 1H, CH), 3.67 (dd, J=13.8, 7.8 Hz, 1H, benzylH), 3.53 (s, 3H, CH₃), 3.35 (dd, J=13.8, 7.8 Hz, 1H, benzylH) ppm.

HRMS: calcd for C₂₀H₁₈FN₄O₂S₂ 429.08552, found 429.08481.

Example 66

Synthesis of 1-(4-(5-amino-2-(1-(4-fluorophenyl)ethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone

To a solution of 2-(1-(4-fluorophenyl)ethyl)-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine (50 mg, 0.14 mmol) and triethylamine (30 μl, 0.21 mmol) in dioxane (1 ml) was added 2-(4-chlorophenoxy)-1-(piperazin-1-yl)ethanone (51 mg, 0.21 mmol). The reaction mixture was heated at 70° C. for 3 hours. After cooling down to room temperature, the volatiles were removed under reduced pressure. The crude residue was purified by chromatography on silica gel (CH₂Cl₂/MeOH 70:1) furnishing the title compound as a white solid (50 mg, 67%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.29-7.25 (m, 4H, PhH), 7.02 (t, J=8.1 Hz, 2H, PhH), 6.92 (d, J=8.9 Hz, 2H, PhH), 4.74 (s, 4H, OCH₂, NH₂), 4.33 (q, J=7.3 Hz, 1H, CH), 4.27 (br s, 4H, N(CH₂)₂), 3.71 (br s, 4H, CON(CH₂)₂), 1.73 (d, J=7.3 Hz, 3H, CHCH₃) ppm.

HRMS: calcd for C₂₅H₂₅ClFN₆O₂S 527.14323, found 527.14230.

Example 67

Synthesis of 1-(4-(5-amino-2-(1-(4-fluorophenyl)-2-phenylethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone

This compound was synthesized from example 65 according to the procedure for the preparation of example 66. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 70:1) to yield the title compound as a white solid (60 mg, 83%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.17-7.28 (m, 7H, PhH), 6.91-7.05 (m, 6H, PhH), 4.74 (s, 2H, OCH₂), 4.70 (s, 2H, NH₂), 4.48 (t, J=7.7 Hz, 1H, CH), 4.24 (br s, 4H, N(CH₂)₂), 3.72 (br s, 2H, CONCH₂), 3.66 (br s, 2H, CONCH₂), 3.62 (dd, J=13.8, 7.7 Hz, 1H, benzylH), 3.26 (dd, J=13.8, 7.8 Hz, 1H, benzylH) ppm.

HRMS: calcd for C₃₁H₂₉ClFN₆O₂S 603.17453, found 603.17371.

Example 68

Synthesis of 4-(5-amino-2-(1-(4-fluorophenyl)ethyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide

This compound was synthesized according to the procedure for the preparation of example 66, using N-m-tolylpiperazine-1-carboxamide. The crude residue was purified by flash chromatography on silica gel (CH₂Cl₂/MeOH 50:1) furnishing the title compound as a white solid (76%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=8.50 (s, 1H, NH), 7.38-7.43 (m, 2H, PhH), 7.32 (s, 1H, PhH), 7.28 (d, J=8.5 Hz, 1H, PhH), 7.18 (t, J=8.9 Hz, 2H, PhH), 7.12 (t, J=7.8 Hz, 1H, PhH), 6.76 (d, J=7.4 Hz, 1H, PhH), 6.33 (s, 2H, NH₂), 4.51 (q, J=7.1 Hz, 1H, CH), 4.22 (br s, 4H, N(CH₂)₂), 3.57 (br s, 4H, CON(CH₂)₂), 2.25 (s, 3H, CH₃), 1.67 (d, J=7.1 Hz, 3H, CHCH₃) ppm.

Example 69

Synthesis of 2-(4-fluorophenyl)-5,7-bis(methylthio)thiazolo[5,4-d]pyrimidine

To a solution of 2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidine-5,7-dithiol (0.20 g, 0.68 mmol) and triethylamine (0.33 ml, 2.37 mmol) in DMSO (3 ml) was added iodomethane (0.13 ml, 2.03 mmol). The reaction mixture was stirred for 12 hours under N₂ at 25° C. The mixture was poured into water and extracted with EtOAc. The organic extracts were dried over Na₂SO₄ and the solvent was removed under reduced pressure. The crude residue was purified by flash chromatography on silica (EtOAc/Hex 1:40), yielding the title compound as a light yellow solid (0.19 g, 87%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.04-8.09 (m, 2H, PhH), 7.18 (t, J=8.6 Hz, 2H, PhH), 2.70 (s, 3H, CH₃), 2.66 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₃H₁₁FN₃S₃ 324.00991, found 324.00908.

Example 70

Synthesis of 5,7-bis(butylthio)-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidine

This compound was synthesized according to a procedure for the preparation of example 69, using n-butyl bromide. The crude residue was purified by flash chromatography on silica (EtOAc/Hex 1:100) to yield the title compound as a white solid (53%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.03-8.08 (m, 2H, PhH), 7.18 (t, J=8.6 Hz, 2H, PhH), 3.34 (t, J=7.3 Hz, 2H, SCH₂), 3.24 (t, J=7.3 Hz, 2H, SCH₂), 1.73-1.82 (m, 4H, SCH₂CH₂CH₂CH₃), 1.48-1.55 (M, 4H, SCH₂CH₂CH₂CH₃), 0.98 (t, J=7.4 Hz, 3H, CH₃), 0.97 (t, J=7.4 Hz, 3H, CH₃) ppm.

HRMS: calcd for C₁₉H₂₃FN₃S₃ 408.10381, found 408.10259.

Example 71

Synthesis of 5,7-bis(benzylthio)-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidine

This compound was synthesized according to a procedure for the preparation of example 69, using benzyl bromide. The crude residue was purified by flash chromatography on silica (EtOAc/Hex 1:100) to yield the title compound as a white solid (97%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.01-8.04 (m, 2H, PhH), 7.41-7.45 (m, 4H, PhH), 7.28-7.32 (m, 6H, PhH), 7.17 (t, J=8.5 Hz, 2H, PhH), 4.54 (s, 2H, CH₂), 4.49 (s, 2H, CH₂) ppm.

HRMS: calcd for C₂₅H₁₉FN₃S₃ 476.0725, found 476.3023.

Example 72

Synthesis of 7-ethoxy-2-(4-fluorophenyl)-5-(methylthio)thiazolo[5,4-d]pyrimidine

To a solution of Na (2.0 mg, 0.08 mmol) in ethanol (1 ml) was added 2-(4-fluorophenyl)-5,7-bis(methylthio)thiazolo[5,4-d]pyrimidine (50 mg, 0.15 mmol). The reaction mixture was heated at 80° C. for 3 hours. After cooling, the mixture was neutralized with 1N HCl and the solvent was removed under reduced pressure. The crude residue was redissolved in ethyl acetate, extracted with brine and dried over Na₂SO₄. After removing the solvents in vacuo, the residue was purified by flash chromatography on silica (EtOAc/Hex 1:50), yielding the title compound as a white solid (30 mg, 60%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.02-8.07 (m, 2H, PhH), 7.17 (t, J=8.6 Hz, 2H, PhH), 4.71 (q, J=7.1 Hz, 2H, OCH₂), 2.63 (s, 3H, SCH₃) 1.54 (t, J=7.1 Hz, 3H, CH₃) ppm.

HRMS: calcd for C₁₄H₁₃FN₃OS₂ 322.04841, found 322.04753.

Example 73

Synthesis of 7-ethoxy-2-(4-fluorophenyl)-5-methylsulfonyl-thiazolo[5,4-d]pyrimidine

This compound was synthesized according to a procedure for the preparation of example 21. The crude residue was purified by flash chromatography on silica (EtOAc/Hex 1:30) to yield the title compound as a white solid (61%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.11-8.16 (m, 2H, PhH), 7.23 (t, J=8.6 Hz, 2H, PhH), 4.84 (q, J=7.1 Hz, 2H, CH₂), 1.61 (t, J=7.1 Hz, 3H, CH₃) ppm.

HRMS: calcd for C₁₄H₁₃FN₃O₃S₂ 354.03824, found 354.03748.

Examples 74-76

Synthesis of diethyl 2-(acylamino)malonate analogues

General Procedure

To a solution of diethyl 2-aminomalonate hydrochloride (4.23 g, 20 mmol) in pyridine (50 ml) was added an acid chloride (20 mmol). The resulting mixture was stirred at room temperature for 1 hour. The solvents were evaporated in vacuo. The residue was collected, washed with water and dried over P₂O₅, yielding the title compound.

The following compounds were synthesized according to this procedure:

Example 74

Synthesis of diethyl 2-(cyclopropanecarboxamido)malonate

This compound was synthesized in 91% yield, using cyclopropanecarbonyl chloride.

MS m/z (%): 244 ([M+H]⁺, 100)

Example 75

Synthesis of diethyl 2-(2-methoxyacetamido)malonate

This compound was synthesized from 2-methoxyacetyl chloride in 97% yield.

MS m/z (%): 248 ([M+H]⁺, 100)

Example 76

Synthesis of diethyl 2-hexanamidomalonate

This compound was synthesized from hexanoyl chloride in 95% yield.

MS m/z (%): 274 ([M+H]⁺, 100)

Examples 77-79

Synthesis of 2-amino-4,6-dihydroxy-5-(acylamino)pyrimidine analogues

General Procedure

Sodium (0.58 g, 25 mmol) was added to absolute ethanol (50 ml). After sodium was completely dissolved, diethyl 2-(acylamino)malonate (2.43 g, 10 mmol) and guanidine hydrochloride (1.20 g, 12.5 mmol) were added. The resulting mixture was heated under reflux for 1.5 h. The reaction mixture was cooled down to room temperature. The precipitate was collected by filtration, and washed with ethanol. The precipitate was then dissolved in a small amount of water and neutralized to pH=3-4 with acetic acid. The precipitate was collected, washed with water and dried over P₂O₅, yielding the title compounds

The following compounds were synthesized according to this procedure:

Example 77

Synthesis of 2-amino-4,6-dihydroxy-5-(cyclopropanamido)pyrimidine

This compound was synthesized from diethyl 2-(cyclopropanecarboxamido)malonate in 91% yield.

MS m/z (%): 209 ([M−H]⁻, 100)

Example 78

Synthesis of 2-amino-4,6-dihydroxy-5-(2-methoxyacetamido)pyrimidine

This compound was synthesized from diethyl 2-(2-methoxyacetamido)malonate in 65% yield.

MS m/z (%): 213 ([M−H]⁻, 100)

Example 79

Synthesis of 2-amino-4,6-dihydroxy-5-hexanamidopyrimidine

This compound was synthesized from diethyl 2-hexanamidomalonate (2.73 g, 10 mmol) in 83% yield.

MS m/z (%): 239 ([M−H]⁻, 100)

Examples 80-86

Synthesis of 2-amino-5-acylamino-4,6-dihydroxypyrimidine analogues

General Procedure

To an ice-cooled solution of 2,5-diaminopyrimidine-4,6-diol (1.78 g, 10 mmol) in 1 N NaOH (25 ml), was added slowly an appropriate acid chloride (10 mmol). The resulting mixture was stirred and warmed to room temperature over 1 hour. The reaction mixture was neutralized with HCl to pH 5. The precipitate was filtered off, washed with water and dried over P₂O₅, yielding the title compound.

The following compounds were synthesized according to this general procedure:

Example 80

Synthesis of 2-amino-5-cyclohexanecarboxamido-4,6-dihydroxypyrimidine

This compound was synthesized from cyclohexane carbonyl chloride in 87% yield.

MS m/z (%): 253 ([M+H]⁺, 100)

Example 81

Synthesis of 2-amino-4,6-dihydroxy-5-nicotinamidopyrimidine

This compound was synthesized from nicotinoyl chloride hydrochloride in 81% yield.

MS m/z (%): 248 ([M+H]⁺, 100)

Example 82

Synthesis of 2-amino-4,6-dihydroxy-5-(3-phenylpropanamido)pyrimidine

This compound was synthesized from 3-phenylpropanoyl chloride in 96% yield.

MS m/z (%): 275 ([M+H]⁺, 100)

Example 83

Synthesis of 2-amino-4,6-dihydroxy-5-(4-chlorophenylacetamido)pyrimidine

This compound was synthesized from 4-chlorophenylacetyl chloride yielding the title compound in 95% yield.

MS m/z (%): 295 ([M+H]⁺, 100)

Example 84

Synthesis of 2-amino-4,6-dihydroxy-5-(3,4-dichlorobenzamido)pyrimidine

This compound was synthesized from 3,4-dichlorobenzoyl chloride yielding the title compound in 89% yield.

MS m/z (%): 315 ([M+H]⁺, 100)

Example 85

Synthesis of 2-amino-4,6-dihydroxy-5-(3-methoxybenzamido)pyrimidine

This compound was synthesized from 3-methoxybenzoyl chloride, yielding the title compound in 94% yield.

MS m/z (%): 277 ([M+H]⁺, 100)

Example 86

Synthesis of ethyl 2-amino-4,6-dihydroxypyrimidin-5-ylcarbamate

This compound was synthesized from ethyl chloroformate yielding the title compound in 89% yield.

Examples 87-88

Synthesis of 2-amino-4,6-dihydroxy-5-(acylamino)pyrimidine analogues

General Procedure

A suspension of 1-phenylcyclopropanecarboxylic acid (973 mg, 6.0 mmol) in SOCl₂ (5 ml) was heated under reflux for 1 h. After concentration under reduced pressure, the residue was redissolved in dioxane (5 ml) and added to a stirring solution of 2,5-diamino-4,6-dihydroxypyrimidine (893 mg, 5.0 mmol) in 1 N NaOH (20 ml) at 0° C. The mixture was stirred and warmed to room temperature in 1 h. After neutralization with 1 N hydrochloride to pH=5, the precipitate was filtered off, washed with water and dried over P₂O₅, yielding the title compound.

The following compounds were synthesized according to this procedure:

Example 87

Synthesis of 2-amino-4,6-dihydroxy-5-(1-phenylcyclopropanecarboxamido)pyrimidine

This compound was synthesized using 1-phenylcyclopropanecarboxylic acid, yielding the title compound in 87% yield.

MS m/z (%): 285 ([M−H]⁻, 100)

Example 88

Synthesis of 2-amino-4,6-dihydroxy-5-(1-(4-chlorophenyl)cyclopropanecarboxamido)pyrimidine

This compound was synthesized from 1-(4-chlorophenyl)cyclopropanecarboxylic acid yielding the title compound in 84% yield.

MS m/z (%): 321 ([M+H]⁺, 100)

Examples 89-98

Synthesis of 5-amino-2-substituted-thiazolo[5,4-d]pyrimidine-7-thiol analogues

General Procedure

A suspension of the appropriate 2-amino-4,6-dihydroxy-5-(acylamino)pyrimidine analogue (630 mg, 3 mmol) and P₂S₅ (1.33 g, 6 mmol) in pyridine (15 ml) was heated under reflux for 6 hours. After concentration under reduced pressure, the residue was resuspended in 20 ml water. Sodium carbonate (1.27 g, 9 mmol) was added and the mixture was stirred at room temperature for 1 h. The precipitate was collected by filtration and washed with water, yielding the crude title compound which was used without further purification (450 mg, 67%). The following compounds were synthesized according to this procedure:

Example 89

Synthesis of 5-amino-2-cyclopropylthiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-4,6-dihydroxy-5-(acylamino)pyrimidine in 67% yield.

MS m/z (%): 223 ([M−H]⁻, 100)

Example 90

Synthesis of 5-amino-2-(2-phenylethyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-4,6-dihydroxy-5-(3-phenylpropanamido)pyrimidine (550 mg, 2.0 mmol), yielding the title compound (530 mg, 92%).

MS m/z (%): 289 ([M+H]⁺, 100)

Example 91

Synthesis of 5-amino-2-(3-pyridinyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-4,6-dihydroxy-5-(3-nicotinamido)pyrimidine (494 mg, 2.0 mmol), yielding the title compound (260 mg, 50%).

MS m/z (%): 262 ([M+H]⁺, 100)

Example 92

Synthesis of 5-amino-2-(cyclohexyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-4,6-dihydroxy-5-cyclohexanecarboxamidopyrimidine (504 mg, 2.0 mmol), yielding the title compound (400 mg, 75%).

MS m/z (%): 267 ([M+H]⁺, 100)

Example 93

Synthesis of 5-amino-2-(4-chlorobenzyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-4,6-dihydroxy-5-(4-chlorophenylacetamido)pyrimidine (589 mg, 2.0 mmol), yielding the title compound (500 mg, 81%).

MS m/z (%): 309 ([M+H]⁺, 100)

Example 94

Synthesis of 5-amino-2-(4-chlorophenyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-4,6-dihydroxy-5(4-chlorobenzamido)pyrimidine (560 mg, 2.0 mmol), yielding the title compound (450 mg, 76%).

MS m/z (%): 295 ([M+H]⁺, 100)

Example 95

Synthesis of 5-amino-2-(3-methoxyphenyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-4,6-dihydroxy-5(4-methoxybenzamido)pyrimidine (1.10 g, 4.0 mmol), yielding the title compound (1.0 g, 86%).

MS m/z (%): 291 ([M+H]⁺, 100)

Example 96

Synthesis of 5-amino-2-(3,4-dichlorophenyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-4,6-dihydroxy-5-(3,4-dichlorobenzamido)pyrimidine (1.26 g, 4.0 mmol), yielding the title compound (1.1 g, 83%).

MS m/z (%): 329 ([M+H]⁺, 100)

Example 97

Synthesis of 5-amino-2-(1-phenylcyclopropyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-4,6-dihydroxy-5-(1-phenylcyclopropanecarboxamido)pyrimidine (1.15 g, 4.0 mmol), yielding the title compound (1.1 g, 92%).

MS m/z (%): 301 ([M+H]⁺, 100)

Example 98

Synthesis of 5-amino-2-(1-(4-chlorophenyl)cyclopropyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-4,6-dihydroxy-5-(1-phenylcyclopropanecarboxamido)pyrimidine (1.28 g, 4.0 mmol), yielding the title compound (1.1 g, 82%).

MS m/z (%): 335 ([M+H]⁺, 100)

Examples 99-105

Synthesis of 5-amino-2-substituted-7-methylthio-thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a suspension of an appropriate 5-amino-2-substituted-thiazolo[5,4-d]pyrimidine-7-thiol (340 mg, 1.5 mmol) in 1N NaOH (10 ml), was added MeI (112 μl, 1.8 mmol). The resulting mixture was stirred at room temperature for 30 minutes. The reaction mixture was extracted with dichloromethane and washed with water and brine. The organic layer was evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/50), yielding the pure title compounds.

The following compounds were synthesized according to this procedure:

Example 99

Synthesis of 5-amino-2-cyclopropyl-7-methylthio-thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-cyclopropyl-thiazolo[5,4-d]pyrimidine-7-thiol in 92% yield.

MS m/z (%): 239 ([M+H]⁺, 100)

Example 100

Synthesis of 5-amino-2-(2-phenylethyl)-7-methylthiothiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(2-phenylethyl)thiazolo[5,4-d]pyrimidine-7-thiol (288 mg, 1.0 mmol), yielding the pure title compound (190 mg, 63%).

MS m/z (%): 303 ([M+H]⁺, 100)

Example 101

Synthesis of 5-amino-2-cyclohexyl-7-methylthiothiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-cyclohexylthiazolo[5,4-d]pyrimidine-7-thiol (133 mg, 0.5 mmol), yielding the pure title compound (80 mg, 57%).

MS m/z (%): 281 ([M+H]⁺, 100)

Example 102

Synthesis of 5-amino-2-(3-pyridinyl)-7-methylthiothiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(3-pyridinyl)thiazolo[5,4-d]pyrimidine-7-thiol (261 mg, 1.0 mmol), yielding the pure title compound (150 mg, 54%).

MS m/z (%): 276 ([M+H]⁺, 100)

Example 103

Synthesis of 5-amino-2-(4-chlorobenzyl)-7-methylthiothiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(4-chlorobenzyl)thiazolo[5,4-d]pyrimidine-7-thiol (308 mg, 1.0 mmol), yielding the pure title compound (100 mg, 31%).

MS m/z (%): 323 ([M+H]⁺, 100)

Example 104

Synthesis of 5-amino-2-(3-methoxyphenyl)-7-methylthiothiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(3-methoxyphenyl)thiazolo[5,4-d]pyrimidine-7-thiol (290 mg, 1.0 mmol), yielding the pure title compound (250 mg, 82%).

MS m/z (%): 305 ([M+H]⁺, 100)

Example 105

Synthesis of 5-amino-2-(4-chlorophenyl)-7-(methylthio)thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(4-chlorophenyl)thiazolo[5,4-d]pyrimidine-7-thiol (443 mg, 1.5 mmol), yielding the pure title compound (380 mg, 82%).

MS m/z (%): 309 ([M+H]⁺, 100)

Example 106

Synthesis of 5-amino-2-cyclopropyl-7-methylsulfonylthio-thiazolo[5,4-d]pyrimidine

To an ice-cooled suspension of 5-amino-2-cyclopropyl-7-methylthiothiazolo[5,4-d]pyrimidine (120 mg, 0.5 mmol) in dichloromethane (5 ml), was added mCPBA (1250 mg, 1.0 mmol). The resulting mixture was stirred at 0° C. for 1 hour and then warmed to room temperature. The reaction mixture was evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of acetone and dichloromethane (in a ratio of 1/30), yielding the pure title compound (81 mg, 60%).

MS m/z (%): 271 ([M+H]⁺, 100)

Example 107

Synthesis of 5-amino-2-cyclopropyl-7-methoxythiazolo[5,4-d]pyrimidine

A mixture of 5-amino-2-cyclopropyl-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidine (54 mg, 0.2 mmol) and K₂CO₃ (69 mg, 0.5 mmol) in dioxane (10 ml) and methanol (5 ml) was stirred at room temperature overnight. The reaction mixture was evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/60), yielding the pure title compound (40 mg, 90%).

MS m/z (%): 223 ([M+H]⁺, 100)

Example 108

Synthesis of 5-amino-2-cyclopropyl-7-N-piperazino-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-cyclopropyl-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidine (54 mg, 0.2 mmol) in dioxane (5 ml) was added piperazine (86 mg, 1.0 mmol). The resulting mixture was stirred at room temperature for 12 h. The solvents were evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/5), yielding the pure title compound (50 mg, 91%).

MS m/z (%): 277 ([M+H]⁺, 100)

Examples 109-111

Synthesis of 5-amino-2-substituted-7-(N-piperazino)thiazolo[5,4-d]pyrimidine analogues

General Procedure

A mixture of a 5-amino-2-substituted thiazolo[5,4-d]pyrimidine-7-thiol analogue (4.0 mmol) and piperazine (1.72 g, 20 mmol) in 1,1,1,3,3,3-hexamethyldisilazane (HMDS, 5 ml) and pyridine (20 ml) was heated under reflux for 12 hours. The reaction mixture was evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/5), yielding the pure title compounds.

The following compounds were made according to this procedure:

Example 109

Synthesis of 5-amino-2-(3,4-dichlorophenyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(3,4-chlorophenyl)thiazolo[5,4-d]pyrimidine-7-thiol in 51% yield.

MS m/z (%): 381 ([M+H]⁺, 100)

Example 110

Synthesis of 5-amino-2-(1-phenylcyclopropyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(1-phenylcyclopropyl)thiazolo[5,4-d]pyrimidine-7-thiol (600 mg, 2.0 mmol), yielding the pure title compound (450 mg, 64%).

MS m/z (%): 353 ([M+H]⁺, 100)

Example 111

Synthesis of 5-amino-2-(1-(4-chlorophenyl)cyclopropyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(1-phenylcyclopropyl)thiazolo[5,4-d]pyrimidine-7-thiol (1.34 g, 4.0 mmol), yielding the pure title compound (1.1 g, 71%).

MS m/z (%): 387 ([M+H]⁺, 100)

Example 112

Synthesis of 5-amino-2-methylthio-7-oxo-thiazolo[5,4-d]pyrimidine

A suspension of ethyl 2-amino-4,6-dihydroxypyrimidin-5-ylcarbamate (0.43 g, 2.0 mmol) and P₂S₅ (1.33 g, 6 mmol) in pyridine (20 ml) was heated under reflux for 6 hours. After concentration under reduced pressure, the residue was suspended in water (20 ml). Sodium carbonate (1.27 g, 9 mmol) was added and the mixture was stirred at room temperature for 1 h. The reaction mixture was neutralized to pH=5-6, the precipitate was filtered off and washed with water. The crude product was dissolved in 1N NaOH (20 ml) and MeI (120 μl, 2.0 mmol) was added. The resulting mixture was stirred at room temperature for 30 minutes. The reaction mixture was extracted with dichloromethane and washed with water and brine. The organic layer was evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/50), yielding the pure title compound (210 mg, 49%).

MS m/z (%): 215 ([M+H]⁺, 100)

Example 113

Synthesis of 5-amino-7-N-piperazino-2-methylthio-thiazolo[5,4-d]pyrimidine

To a suspension of 5-amino-7-oxo-2-thiomethyl-thiazolo[5,4-d]pyrimidine (107 mg, 0.5 mmol) in DMF (5 ml) were added piperazine (215 mg, 2.5 mmol), benzotriazol-1-yloxytris(dimethylamino)-phosphonium hexafluorophosphate (BOP, 290 mg, 0.66 mmol) and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU, 120 μl, 0.79 mmol), respectively. The resulting reaction mixture was stirred at room temperature for 6 h. The reaction mixture was diluted with dichloromethane and washed with water and brine. The organic phase was evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/8), yielding the pure title compound (130 mg, 82%).

MS m/z (%): 283 ([M+H]⁺, 100)

Examples 114-117

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-substituted thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of a 5-amino-2-substituted-7-N-piperazino-thiazolo[5,4-d]pyrimidine analogue (260 mg, 1.0 mmol) in dioxane (10 ml), was added DIPEA (330 μl, 2.0 mmol) and 4-chlorophenoxyacetyl chloride (246 mg, 1.2 mmol) respectively. The resulting reaction mixture was stirred at room temperature for 30 minutes. The mixture was evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/40), yielding the pure title compounds.

The following compounds were synthesized according to this procedure:

Example 114

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(1-phenylcyclopropyl)thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(1-phenylcyclopropyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine (35 mg, 0.1 mmol), yielding the pure title compound (49 mg, 92%).

MS m/z (%): 521 ([M+H]⁺, 100)

Example 115

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-methylthio-thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-7-(N-piperazino)-2-methylthio-thiazolo[5,4-d]pyrimidine (113 mg, 0.36 mmol), yielding the pure title compound (120 mg, 75%).

MS m/z (%): 451 ([M+H]⁺, 100)

Example 116

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(3,4-dichlorophenyl)thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(3,4-dichlorophenyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine (190 mg, 0.5 mmol), yielding the pure title compound (150 mg, 55%).

¹H NMR (300 MHz, DMSO-d6, 25° C.): δ=8.13 (s, 1H, ArH), 7.91 (d, J=8.6 Hz, 1H, ArH), 7.74 (d, J=8.6 Hz, 1H, ArH), 7.32 (d, J=9.0 Hz, 2H, ArH), 6.97 (d, J=9.0 Hz, 2H, ArH), 4.93 (s, 2H, NH₂), 4.90 (s, 2H, CH₂), 4.42 (br s, 2H, NCH₂), 4.22 (br s, 2H, NCH₂), 3.64 (br s, 4H, NCH₂) ppm.

MS m/z (%): 549 ([M+H]⁺, 98)

Example 117

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(1-(4-chlorophenyl)cyclopropyl)thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(1-(4-chlorophenyl)cyclopropyl)-7-(N-piperazino)thiazolo[5,4-d]pyrimidine (39 mg, 0.1 mmol), yielding the pure title compound (50 mg, 89%).

MS m/z (%): 555 ([M+H]⁺, 100)

Examples 118-124

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-substituted-thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of a 5-amino-7-methylthio-2-substituted-thiazolo[5,4-d]pyrimidine analogue (76 mg, 0.25 mmol) in dichloromethane (10 ml) was added mCPBA (250 mg, 1.0 mmol). The solution was stirred at room temperature for 2 h. Then, a solution of piperazine (215 mg, 2.5 mmol) in dioxane (10 ml) was added. The resulting mixture was stirred at room temperature for another 2 h. The reaction mixture was diluted with dichloromethane and washed with water and brine. The organic phase was evaporated in vacuo and the residue was dissolved in dioxane (5 ml). Then, a solution of 4-chlorophenoxyacetyl chloride in dioxane (2 ml) was added. The mixture was stirred at room temperature for 1 h. The solvents were evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/50), yielding the pure title compound.

The following compounds were made according to this procedure:

Example 118

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(2-phenylethyl)thiazolo[5,4-d]pyrimidine

This compound was made from 5-amino-7-methylthio-2-(2-phenylethyl)thiazolo[5,4-d]pyrimidine in 71% yield.

MS m/z (%): 509 ([M+H]⁺, 100)

Example 119

Synthesis of 5-amino-2-cyclopropyl-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-thiazolo[5,4-d]pyrimidine

This compound was made from 5-amino-2-cyclopropyl-7-N-piperazino-thiazolo[5,4-d]pyrimidine (15 mg, 0.05 mmol), yielding the pure title compound (20 mg, 83%).

MS m/z (%): 445 ([M+H]⁺, 100)

Example 120

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-cyclohexylthiazolo[5,4-d]pyrimidine

This compound was made from 5-amino-2-cyclohexyl-7-methylthiothiazolo[5,4-d]pyrimidine (56 mg, 0.2 mmol), yielding the pure title compound (60 mg, 62%).

MS m/z (%): 487 ([M+H]⁺, 100)

Example 121

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(pyridine-3-yl)thiazolo[5,4-d]pyrimidine and 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(N-oxopyridine-3-yl)thiazolo[5,4-d]pyrimidine

These compounds were prepared from 5-amino-7-(methylthio)-2-(pyridine-3-yl)thiazolo[5,4-d]pyrimidine (69 mg, 0.25 mmol), yielding examples 121a and 121b.

Example 121a

5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(pyridine-3-yl)thiazolo[5,4-d]pyrimidine (50 mg, 41%)

MS m/z (%): 482 ([M+H]⁺, 100) and

Example 121b

5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(N-oxopyridine-3-yl)thiazolo[5,4-d]pyrimidine (20 mg, 17%)

MS m/z (%): 498 ([M+H]⁺, 100)

Example 122

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(4-chlorophenylmethyl)thiazolo[5,4-d]pyrimidine

This compound was made from 5-amino-2-(4-chlorophenylmethyl)-7-methylthiothiazolo[5,4-d]pyrimidine (100 mg, 0.31 mmol), yielding the pure title compound (140 mg, 85%).

MS m/z (%): 529 ([M+H]⁺, 100)

Example 123

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(4-chlorophenyl)thiazolo[5,4-d]pyrimidine

This compound was made from 5-amino-2-(4-chlorophenyl)-7-methylthiothiazolo[5,4-d]pyrimidine (154 mg, 0.5 mmol), yielding the pure title compound (190 mg, 74%).

¹H NMR (300 MHz, DMSO-d6, 25° C.): δ=7.94 (d, J=9.0 Hz, 2H, ArH), 7.58 (d, J=9.0 Hz, 2H, ArH), 7.34 (d, J=9.0 Hz, 2H, ArH), 6.99 (d, J=9.0 Hz, 2H, ArH), 6.55 (s, 2H, NH₂), 4.93 (s, 2H, CH₂), 4.35 (br s, 2H, NCH₂), 4.22 (br s, 2H, NCH₂), 3.64 (br s, 4H, NCH₂) ppm.

MS m/z (%): 515 ([M+H]⁺, 100)

Example 124

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(3-methoxyphenyl)thiazolo[5,4-d]pyrimidine

This compound was made from 5-amino-2-(3-methoxyphenyl)-7-methylthiothiazolo[5,4-d]pyrimidine (152 mg, 0.5 mmol), yielding the pure title compound (120 mg, 47%).

¹H NMR (300 MHz, DMSO-d6, 25° C.): δ=7.51-7.41 (m, 3H, ArH), 7.32 (d, J=9.0 Hz, 2H, ArH), 7.09 (m, 1H, ArH), 6.97 (d, J=9.0 Hz, 2H, ArH), 6.52 (s, 2H, NH₂), 4.93 (s, 2H, CH₂), 4.36 (br s, 2H, NCH₂), 4.22 (br s, 2H, NCH₂), 3.84 (s, 3H, OCH₃), 3.64 (br s, 4H, NCH₂) ppm.

MS m/z (%): 511 ([M+H]⁺, 100)

Example 125

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(1-(4-chlorophenyl)ethyl)thiazolo[5,4-d]pyrimidine

To a suspension of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(4-chlorophenylmethyl)thiazolo[5,4-d]pyrimidine (53 mg, 0.1 mmol) in DMF (2 ml) was added 1N NaOH (150 μl, 0.15 mmol) and MeI (7 μl, 0.11 mmol). The resulting mixture was stirred at room temperature for 1 hour. The reaction mixture was diluted with dichloromethane and washed with water and brine. The organic layer was evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/80), yielding the pure title compound (40 mg, 74%).

MS m/z (%): 543 ([M+H]⁺, 100)

Example 126

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-methylsulfinyl-thiazolo[5,4-d]pyrimidine

To an ice cooled suspension of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-methylthio-thiazolo[5,4-d]pyrimidine (90 mg, 0.2 mmol) in dichloromethane (5 ml) was added mCPBA (125 mg, 0.5 mmol). The resulting mixture was stirred at 0° C. for 2 h. The solvents were evaporated in vacuo and the crude residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/80), yielding the pure title compound (65 mg, 70%).

MS m/z (%): 467 ([M+H]⁺, 100)

Example 127

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-(4-fluorophenylamino)-thiazolo[5,4-d]pyrimidine

A mixture of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-methylsulfinyl-thiazolo[5,4-d]pyrimidine (47 mg, 0.1 mmol) and 4-fluoroaniline (95 μl, 1 mmol) in dioxane (5 ml) was heated under reflux for 12 hours. The reaction mixture was evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/80), yielding the pure title compound (45 mg, 88%).

MS m/z (%): 514 ([M+H]⁺, 100)

Examples 128-129

Synthesis of 5-amino-2-(4-fluorophenyl)-7-(4-(2-aryloxyacetyl)-piperazin-1-yl)-thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of 5-amino-2-(4-fluorophenyl)-7-piperazin-1-yl-thiazolo[5,4-d]pyrimidine (50 mg, 0.15 mmol) and a 2-aryloxyacetic acid derivative (0.23 mmol) in DMF (2 ml) was added TBTU (0.23 mmol) followed by diisopropylethylamine (0.23 mmol, 37 μL). The reaction was stirred at room temperature for 24 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compounds which were characterized by their mass spectra as indicated below.

The following compounds were synthesized according to this procedure:

Example 128

Synthesis of 5-amino-2-(4-fluorophenyl)-7-(4-[2-(4-bromophenoxy)acetyl]-piperazin-1-yl)-thiazolo[5,4-d]pyrimidine

This compound was obtained from 2-(4-bromophenoxy)acetic acid (43 mg);

MS m/z (%): 543 ([M+H]⁺, 100).

Example 129

Synthesis of 5-amino-2-(4-fluorophenyl)-7-(4-[2-(3-nitrophenoxy)acetyl]-piperazin-1-yl)-thiazolo[5,4-d]pyrimidine

This compound was obtained from 2-(3-nitrophenoxy)acetic acid (49 mg).

MS m/z (%): 510 ([M+H]⁺, 100).

Example 130

Synthesis of 5-amino-2-(4-fluorophenyl)-7-(4-(2-phenoxyacetyl)-piperazin-1-yl)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-(4-fluorophenyl)-7-piperazin-1-yl-thiazolo[5,4-d]pyrimidine (50 mg, 0.15 mmol) in DMF (2 ml) was added diisopropylethylamine (0.33 mmol, 55 μL) followed by phenoxyacetyl chloride (0.17 mmol). The reaction was stirred at room temperature for 4 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 0.5% CH₃OH in CH₂Cl₂), yielding the pure title compound (30 mg) which was characterized by its mass spectrum: MS m/z (%): 465 ([M+H]⁺, 100).

Example 131

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(3-nitrophenoxy)acetyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-piperazin-1-yl-thiazolo[5,4-d]pyrimidine (50 mg, 0.14 mmol) and 3-nitrophenoxyacetic acid (0.23 mmol) in DMF (2 ml) was added TBTU (0.21 mmol) followed by diisopropylethylamine (0.21 mmol, 35 μL). The reaction was stirred at room temperature for 24 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 0.5% CH₃OH in CH₂Cl₂), yielding the pure title compound (41 mg) which was characterized by its mass spectrum: MS m/z (%): 538 ([M+H]⁺, 100).

Example 132

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(4-chlorophenyl)acetyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-piperazin-1-yl-thiazolo[5,4-d]pyrimidine (50 mg, 0.14 mmol) and 4-chlorophenylacetic acid (0.21 mmol) in DMF (2 ml) was added TBTU (0.21 mmol) followed by diisopropylethylamine (0.21 mmol, 35 μL). The reaction was stirred at room temperature for 24 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compound (44 mg) which was characterized by its mass spectrum: MS m/z (%): 511 ([M+H]⁺, 100).

Example 133

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-m-tolylcarbamoylpiperazin-1-yl)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-piperazin-1-yl-thiazolo[5,4-d]pyrimidine (50 mg, 0.14 mmol) in dichloromethane (4 ml) was added 3-methylphenylisocyanate (0.15 mmol). The reaction was stirred at room temperature for 2 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 2% CH₃OH in CH₂Cl₂), yielding the pure title compound (28 mg) which was characterized by its mass spectrum: MS m/z (%): 492 ([M+H]⁺, 100).

Example 134

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-phenoxyacetyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-piperazin-1-yl-thiazolo[5,4-d]pyrimidine (50 mg, 0.14 mmol) in dichloromethane (4 ml) was added diisopropylethylamine (0.33 mmol, 55 μL) followed by phenoxyacetyl chloride (0.17 mmol). The reaction was stirred at room temperature for 4 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 2% CH₃OH in CH₂Cl₂), yielding the pure title compound (34 mg) which was characterized by its mass spectrum: MS m/z (%): 493 ([M+H]⁺, 100).

Example 135

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-[4-(4-chlorobenzoyl)piperazin-1-yl]-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-piperazin-1-yl-thiazolo[5,4-d]pyrimidine (50 mg, 0.14 mmol) in dichloromethane (4 ml) was added diisopropylethylamine (0.33 mmol, 55 μL) and 4-chlorobenzoyl chloride (0.15 mmol). The reaction was stirred at room temperature for 16 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compound (31 mg) which was characterized by its mass spectrum: MS m/z (%): 497 ([M+H]⁺, 100).

Example 136

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-[4-(3-phenylpropionyl)piperazin-1-yl]-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-piperazin-1-yl-thiazolo[5,4-d]pyrimidine (80 mg, 0.22 mmol) in dichloromethane (4 ml) was added diisopropylethylamine (0.49 mmol, 81 μL) and 3-phenylpropionyl chloride (0.25 mmol). The reaction was stirred at room temperature for 16 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compound (43 mg) which was characterized by its mass spectrum: MS m/z (%): 491 ([M+H]⁺, 100).

Example 137

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-[4-phenylmethanesulfonylpiperazin-1-yl]-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-piperazin-1-yl-thiazolo[5,4-d]pyrimidine (80 mg, 0.22 mmol) in 1,4-dioxane (4 ml) was added diisopropylethylamine (0.49 mmol, 81 μL) and phenylmethanesulfonyl chloride (0.25 mmol). The reaction was stirred at 90° C. for 16 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compound (13 mg) which was characterized by its mass spectrum: MS m/z (%): 513 ([M+H]⁺, 100).

Example 138

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(4-chlorophenoxy)acetyl]homopiperazin-1-yl)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-methanesulfonyl-thiazolo[5,4-d]pyrimidine (50 mg, 0.14 mmol) in dichloromethane (4 ml) was added homopiperazine (1.4 mmol). The reaction mixture was stirred at room temperature for 2 hours. The mixture was extracted, the organic phase was dried over MgSO₄ after which the solvent was removed in vacuo. The residue was dissolved in dichloromethane whereupon diisopropylethylamine (0.28 mmol, 47 μL) followed by 4-chlorophenoxyacetyl chloride (0.14 mmol) were added. The reaction was stirred at room temperature for 24 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compound (38 mg) which was characterized by its mass spectrum: MS m/z (%): 541 ([M+H]⁺, 100).

Examples 139-141

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[alkyl(aryl)methylphenylcarbamoyl)methyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-methanesulfonyl-thiazolo[5,4-d]pyrimidine (100 mg, 0.28 mmol) in dichloromethane (5 ml) was added diisopropylethylamine (0.59 mmol, 98 μL) and a piperazine derivative (0.31 mmol). The reaction mixture was stirred at room temperature for 18 hours whereupon the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compounds which were characterized by their mass spectra as indicated below.

The following compounds were made according to this procedure:

Example 139

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[(methylphenylcarbamoyl)-methyl]piperazin-1-yl)-thiazolo[5,4-d]pyrimidine

This compound was obtained from N-methyl-N-phenyl-2-piperazin-1-yl-acetamide (62 mg).

MS m/z (%): 506 ([M+H]⁺, 100).

Example 140

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-thiazol-2-yl-piperazine-1-yl)-thiazolo[5,4-d]pyrimidine

This compound was obtained from 4-thiazol-2-yl-piperazine (65 mg).

MS m/z (%): 442 ([M+H]⁺, 100).

Example 141

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-(phenethylcarbamoyl-methyl)piperazin-1-yl)-thiazolo[5,4-d]pyrimidine

This compound was obtained from 4-(phenethylcarbamoyl-methyl)piperazine (84 mg).

MS m/z (%): 520 ([M+H]⁺, 100).

Example 142

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-((3-(R)-tert-butoxycarbonylamino)pyrrolidin-1-yl)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-methanesulfonyl-thiazolo[5,4-d]pyrimidine (150 mg, 0.42 mmol) in dichloromethane (10 ml) was added diisopropylethylamine (0.94 mmol, 155 μL) and 3-(R)-tert-(butoxycarbonylamino)pyrrolidine (0.47 mmol). The reaction mixture was stirred at room temperature for 24 hours. The reaction mixture was extracted with a saturated sodium bicarbonate solution and the organic phase was collected and dried over magnesium sulfate. The solvent was removed in vacuo and the resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compound (168 mg) which was characterized by its mass spectrum: MS m/z (%): 459 ([M+H]⁺, 100).

Examples 143-144

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(3-(R)-acylaminopyrrolidin-1-yl)-thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-((3-(R)-tert-butoxycarbonylamino)pyrrolidin-1-yl)-thiazolo[5,4-d]pyrimidine (70 mg, 0.15 mmol) in dichloromethane (3 ml) was added trifluoroacetic acid (3 ml). The reaction mixture was stirred at room temperature for 2 hours after which the solvents were removed in vacuo. The residue was dissolved in dichloromethane (3 ml) and diisopropylethylamine (1.5 mmol, 252 μL) and an acyl chloride (0.17 mmol) were added. The reaction mixture was stirred at room temperature for 16 hours whereupon the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1.5% CH₃OH in CH₂Cl₂), yielding the pure title compounds which were characterized by their mass spectra as indicated below.

The following compounds were made according to this procedure:

Example 143

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(3-(R)-[2-(4-chlorophenoxy)-acetylamino]pyrrolidin-1-yl)-thiazolo[5,4-d]pyrimidine

This compound was obtained from 4-chlorophenoxyacetyl chloride (43 mg);

MS m/z (%): 527 ([M+H]⁺, 100).

Example 144

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(3-(R)-(4-chlorobenzoylamino)-pyrrolidin-1-yl)-thiazolo[5,4-d]pyrimidine

This compound was obtained from 4-chlorobenzoyl chloride (44 mg).

MS m/z (%): 497 ([M+H]⁺, 100).

Example 145

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(1-benzyloxycarbonylpiperidin-3-ylamino)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-methanesulfonyl-thiazolo[5,4-d]pyrimidine (50 mg, 0.14 mmol) in 1,4-dioxane (5 ml) was added potassium carbonate (0.42 mmol) and benzyl 3-aminopiperidine-1-carboxylate hydrogen chloride (0.15 mmol). The reaction mixture was stirred at room temperature for 24 hours whereupon the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compound (59 mg) which was characterized by its mass spectrum: MS m/z (%): 507 ([M+H]⁺, 100).

Example 146

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(1-tert-butoxycarbonylpyrrolidin-3-(S)-ylamino)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-methanesulfonyl-thiazolo[5,4-d]pyrimidine (150 mg, 0.42 mmol) in dichloromethane (10 ml) was added diisopropylethylamine (3.0 mmol, 492 μL) and tert-butyl 3-(S)-aminopyrrolidine-1-carboxylate (2.1 mmol). The reaction mixture was refluxed for 40 hours whereupon the mixture was extracted with a saturated sodium bicarbonate solution. The organic phase was dried over magnesium sulfate and the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compound (81 mg) which was characterized by its mass spectrum: MS m/z (%): 459 ([M+H]⁺, 100).

Example 147

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(1-(4-chlorophenoxyacetyl)pyrrolidin-3-(S)-ylamino)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(1-tert-butoxycarbonyl-pyrrolidin-3-(S)-ylamino)-thiazolo[5,4-d]pyrimidine (70 mg, 0.15 mmol) in dichloromethane (1 ml) was added trifluoroacetic acid (1 ml). The reaction mixture was stirred at room temperature for 2 hours after which the solvents were removed in vacuo. The residue was dissolved in dichloromethane (3 ml) and diisopropylethylamine (1.5 mmol, 252 μL) and 4-chlorophenoxyacetyl chloride (0.17 mmol) were added. The reaction mixture was stirred at room temperature for 16 hours whereupon the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1.5% CH₃OH in CH₂Cl₂), yielding the pure title compound (37 mg) which was characterized by its mass spectrum: MS m/z (%): 527 ([M+H]⁺, 100).

Example 148

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-benzoylpiperidine-1-yl)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-methanesulfonyl-thiazolo[5,4-d]pyrimidine (50 mg, 0.14 mmol) in acetonitrile (5 ml) was added diisopropylethylamine (0.45 mmol, 74 μL) and 4-benzoylpiperidine hydrogen chloride (0.15 mmol). The reaction mixture was stirred at room temperature for 16 hours whereupon the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compound (59 mg) which was characterized by its mass spectrum: MS m/z (%): 462 ([M+H]⁺, 100).

Example 149

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-(2-phenoxyethyl)piperazin-1-yl)-thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-6H-thiazolo[5,4-d]pyrimidin-7-one (133 mg, 0.46 mmol) in DMF (5 ml) was added DBU (0.69 mmol), BOP (0.59 mmol) and 1-(2-phenoxyethyl)piperazine (1.37 mmol). The reaction mixture was stirred at room temperature for 3 hours whereupon the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 2% CH₃OH in CH₂Cl₂), yielding the pure title compound (56 mg) which was characterized by its mass spectrum: MS m/z (%): 479 ([M+H]⁺, 100).

Example 150

Synthesis of 5-amino-2-[1-(4-fluorophenyl)propyl]-7-(4-[2-(4-chlorophenoxy)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-(4-fluorobenzyl)-7-methylsulfanylthiazolo[5,4-d]pyrimidine (100 mg, 0.33 mmol) in DMSO (1.5 ml) was added sodium hydroxide (2N, 171 μL) and ethyl iodide (0.34 mmol). The reaction mixture was stirred at room temperature for 16 hours whereupon the mixture was extracted with ethyl acetate and brine. The organic phase was dried over magnesium sulfate and concentrated by evaporation in vacuo. The resulting residue was dissolved in dichloromethane (3 ml), cooled to 0° C. and m-chloroperoxybenzoic acid (0.81 mmol) was added. The reaction mixture was stirred at room temperature for 7 hours. The mixture was first extracted with a saturated sodium bicarbonate solution, then with brine. The combined organic phases were dried over magnesium sulfate. After evaporating the solvents in vacuo, the residue was dissolved again in dichloromethane (3 ml) and piperazine (3.3 mmol) was added. The reaction mixture was stirred at room temperature for 16 hours whereupon the mixture was extracted with brine. The organic phase was dried over magnesium sulfate and evaporated in vacuo. The crude residue was reacted at room temperature for 16 hours with 4-chlorophenoxyacetyl chloride (0.35 mmol) in the presence of diisopropylethylamine (0.72 mmol, 119 μL). After removing the solvent in vacuo, the crude mixture was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1.5% CH₃OH in CH₂Cl₂), yielding the pure title compound (30 mg) which was characterized by its mass spectrum: MS m/z (%): 541 ([M+H]⁺, 100).

Example 151

Synthesis of 5-amino-2-[cyclopentyl-(4-fluorophenyl)methyl]-7-(4-[2-(4-chlorophenoxy)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-(4-fluorobenzyl)-7-methylsulfanylthiazolo[5,4-d]pyrimidine (100 mg, 0.33 mmol) in DMSO (1.5 ml) was added sodium hydroxide (2N, 171 μL) and cyclopentyl iodide (0.34 mmol). The reaction mixture was stirred at room temperature for 16 hours whereupon the mixture was extracted with ethyl acetate and brine. The organic phase was dried over magnesium sulfate and concentrated by evaporation in vacuo. The resulting residue was dissolved in dichloromethane (3 ml), cooled to 0° C. and m-chloroperoxybenzoic acid (0.81 mmol) was added. The reaction mixture was stirred at room temperature for 7 hours. The mixture was first extracted with a saturated sodium bicarbonate solution, then with brine. The combined organic phases were dried over magnesium sulfate. After evaporating the solvents in vacuo, the residue was redissolved in dichloromethane (3 ml) and piperazine (3.3 mmol) was added. The reaction mixture was stirred at room temperature for 16 hours whereupon the mixture was extracted with brine. The organic phase was dried over magnesium sulfate and evaporated in vacuo. The crude residue was reacted at room temperature for 16 hours with 4-chlorophenoxyacetyl chloride (0.35 mmol) in the presence of diisopropylethylamine (0.72 mmol, 119 μL). After removing the solvent in vacuo, the crude mixture was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1.5% CH₃OH in CH₂Cl₂), yielding the pure title compound (47 mg) which was characterized by its mass spectrum: MS m/z (%): 581 ([M+H]⁺, 100).

Example 152

Synthesis of N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-3-thiophen-2-yl-propionamide

To a solution of 2,5-diaminopyrimidine-4,6-diol hydrogen chloride (1.04 g, 5.8 mmol) in sodium hydroxide (17.8 mmol) solution (25 ml of H₂O) was added 3-thiophen-2-ylpropionyl chloride (6.4 mmol). The latter was prepared by refluxing 3-thiophen-2-ylpropionic acid (6.4 mmol) in thionyl chloride (500 μL) for 1 hour whereupon the excess of thionyl chloride was removed by evaporation in vacuo. The reaction mixture was stirred at room temperature for 18 hours. The pH of the suspension was adjusted to approximately 6 and the solids were filtered off. The title compound (1.25 g) was characterized by its mass spectrum: MS m/z (%): 515 ([M+H]⁺, 100).

Example 153

Synthesis of 5-amine-7-piperazin-1-yl-2-(2-thiophen-2-yl-ethyl)-thiazolo[5,4-d]pyrimidine

To a suspension of N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-3-thiophen-2-yl-propionamide (example 153, 1 g, 3.6 mmol) in o-xylene (25 ml) was added phosphorus pentasulfide (5.3 mmol, P₄S₁₀). The reaction mixture was refluxed until all starting material was consumed (TLC monitoring) whereupon the mixture was cooled down to room temperature. The reaction was quenched by adding potassium carbonate (32 mmol) and the mixture was stirred at room temperature for one additional hour. The precipitate was filtered off and the solids were extensively washed with water and subsequently dried. Next, the solids were dissolved in pyridine (20 ml) and piperazine (17.8 mmol), ammonium sulfate (36 mg), p-toluenesulfonic acid (36 mg) and 1,1,1,3,3,3-hexamethyldisilazane (3.6 ml) were added. The reaction mixture was refluxed for 24 hours after which the solvent was evaporated in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 5% CH₃OH in CH₂Cl₂), yielding the pure title compound (656 mg) which was characterized by its mass spectrum: MS m/z (%): 347 ([M+H]⁺, 100).

Examples 154-156

Synthesis of 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-acylpiperazin-1-yl)thiazolo[5,4-d]pyrimidine

General Procedure

To a solution of 5-amine-7-piperazin-1-yl-2-(2-thiophen-2-yl-ethyl)-thiazolo[5,4-d]pyrimidine (example 154, 50 mg, 0.14 mmol) in dichloromethane (3 ml) was added diisopropylethylamine (35 mmol) and an acyl chloride (0.17 mmol). The reaction mixture was stirred at room temperature for 16 hours whereupon the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compounds which were characterized by their mass spectra as indicated below.

The following compounds were synthesized according to this procedure:

Example 154

Synthesis of 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-[2-(4-chlorophenoxy)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine

This compound was obtained from 4-chlorophenoxyacetyl chloride (31 mg).

MS m/z (%): 515 ([M+H]⁺, 100).

Example 155

Synthesis of 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-[2-(4-chloro-phenyl)acetyl]piperazin-1-yl)thiazolo[5,4-d]pyrimidine

This compound was obtained from 4-chlorophenylacetic chloride (23 mg).

MS m/z (%): 499 ([M+H]⁺, 100).

Example 156

Synthesis of 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-(4-chloro-benzoyl)piperazin-1-yl)thiazolo[5,4-d]pyrimidine

This compound was obtained from 4-chlorobenzoyl chloride (29 mg).

MS m/z (%): 485 ([M+H]⁺, 100).

Example 157

Synthesis of 5-amino-2-(2-thiophen-2-ylethyl)-7-(4-m-tolylcarbamoylpiperazin-1-yl)thiazolo[5,4-d]pyrimidine

To a solution of 5-amine-7-piperazin-1-yl-2-(2-thiophen-2-yl-ethyl)-thiazolo[5,4-d]pyrimidine (50 mg, 0.14 mmol) in dichloromethane (3 ml) was added 3-methylphenylisocyanate (0.17 mmol). The reaction mixture was stirred at room temperature for 16 hours whereupon the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 0.5% CH₃OH in CH₂Cl₂), yielding the pure title compound (33 mg) which was characterized by its mass spectrum: MS m/z (%): 480 ([M+H]⁺, 100).

Example 158

Synthesis of N-(4,6-dihydroxypyrimidin-5-yl)-4-fluorobenzamide

Formamidine acetate (0.46 g, 4.46 mmol) and dimethyl 2-(4-fluorobenzamido)malonate (1.0 g, 3.71 mmol) were added to a solution of sodium (0.17 g, 7.43 mmol) in ethanol (37 ml). The reaction mixture was refluxed for 3 hours. After cooling down, the precipitate was filtered off and washed with ethanol. The product was dissolved in a minimal volume of water and acidified to pH 4-5 with 5M HCl. The precipitate was collected, washed with water and dried to yield the title compound as a white solid (0.60 g, 64%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=12.03 (s, 2H, OH), 9.25 (s, 1H, CH), 8.01-8.05 (m, 3H, PhH, NH), 7.32 (t, J=8.3 Hz, 2H, PhH) ppm.

MS: 247.8 [M−H]

Example 159

Synthesis of N-(4,6-dihydroxypyrimidin-5-yl)-2-(4-fluorophenyl)acetamide

This compound was prepared from example 2 in a yield of 24%, according to the procedure for the synthesis of example 158.

¹H NMR (300 MHz, DMSO, 25° C.): δ=12.00 (s, 2H, OH), 9.09 (s, 1H, NH), 7.97 (s, 1H, CH), 7.33-7.37 (m, 2H, PhH), 7.12 (t, J=8.6 Hz, 2H, PhH), 3.59 (s, 2H, CH₂) ppm.

HRMS: calcd for C₁₂H₁₁FN₃O₃264.07844, found 264.07769.

Example 160

Synthesis of N-(4,6-dihydroxy-2-methyl-pyrimidin-5-yl)-2-(4-fluorophenyl)acetamide

This compound was prepared from example 2 in a yield of 29%, according to the procedure for the synthesis of example 9.

¹H NMR (300 MHz, DMSO, 25° C.): δ=11.97 (s, 2H, OH), 8.89 (s, 1H, NH), 7.32-7.37 (m, 2H, PhH), 7.12 (t, J=8.6 Hz, 2H, PhH), 3.56 (s, 2H, CH₂), 2.24 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₃H₁₃FN₃O₃278.09409, found 278.09331.

Example 161

Synthesis of 7-chloro-2-(4-fluorophenyl)-oxazolo[5,4-d]pyrimidine

To a solution of N-(4,6-dihydroxypyrimidin-5-yl)-4-fluorobenzamide (0.30 g, 1.20 mmol) in POCl₃ (6 ml) was added diisopropylethylamine (0.42 ml, 2.41 mmol). The reaction mixture was stirred under N₂ at 90° C. for 3.5 hours. The reaction mixture was allowed to cool down to room temperature and the volatiles were evaporated to dryness. The residue was diluted with water and the aqueous phase was extracted with diethyl ether. The combined organic layers were washed with a saturated NaHCO₃ solution and brine, dried over Na₂SO₄, and concentrated under reduced pressure. The residue was purified by chromatography on silica gel (CH₂Cl₂/MeOH 100:1) to yield the title compound as a white solid (0.13 g, 30%).

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.64 (s, 1H, CH), 8.23-8.27 (m, 2H, PhH), 7.25 (t, J=8.2 Hz, 2H, PhH) ppm.

Example 162

Synthesis of 7-chloro-2-(4-fluorophenyl)-5-methyloxazolo[5,4-d]pyrimidine

This compound was prepared from example 9 in a yield of 40%, according to the procedure for the synthesis of example 161.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.28-8.33 (m, 2H, PhH), 7.26 (t, J=8.6 Hz, 2H, PhH), 2.84 (s, 3H, CH₃) ppm.

HRMS: calcd for C₁₂H₈ClFN₃O 264.03399, found 264.03318.

Example 163

Synthesis of 7-chloro-2-(4-fluorophenyl)-oxazolo[5,4-d]pyrimidin-5-amine

This compound was prepared from example 5 in a yield of 28%, according to the procedure for the synthesis of example 161.

¹H NMR (300 MHz, DMSO, 25° C.): δ=8.13-8.18 (m, 2H, PhH), 7.48 (s, 2H, NH₂), 7.45 (t, J=8.9 Hz, 2H, PhH) ppm.

HRMS: calcd for C₁₁H₇ClFN₄O 265.02924, found 265.02851.

Example 164

Synthesis of 7-chloro-2-(4-fluorobenzyl)-oxazolo[5,4-d]pyrimidine

This compound was prepared from example 159 in a yield of 73%, according to the procedure for the synthesis of example 160.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.77 (s, 1H, CH), 7.36-7.41 (m, 2H, PhH), 7.06 (t, J=8.6 Hz, 2H, PhH), 4.32 (s, 2H, CH₂) ppm.

HRMS: calcd for C₁₂H₈ClFN₃O 264.03399, found 264.03349.

Example 165

Synthesis of 7-chloro-2-(4-fluorobenzyl)-5-methyl-oxazolo[5,4-d]pyrimidine

This compound was prepared from example 159 in a yield of 40%, according to the procedure for the synthesis of example 161.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.35-7.40 (m, 2H, PhH), 7.08 (t, J=8.6 Hz, 2H, PhH), 4.14 (s, 2H, CH₂), 2.68 (s, 3H, CH₃) ppm.

Example 166

Synthesis of 7-chloro-2-(4-fluorophenethyl)-oxazolo[5,4-d]pyrimidin-5-amine

This compound was prepared from example 7 in a yield of 34%, according to the procedure for the synthesis of example 161.

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.28-7.33 (m, 2H, PhH), 7.10 (t, J=8.8 Hz, 2H, PhH), 6.43 (s, 2H, NH₂), 3.16 (br s, 4H, CH₂CH₂) ppm.

Example 167

Synthesis of 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorophenyl)oxazolo[5,4-c]pyrimidin-7-yl)piperazin-1-yl)ethanone

This compound was prepared from example 161 in a yield of 60%, according to the procedure for the synthesis of example 47.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.34 (s, 1H, CH), 7.90-7.94 (m, 2H, PhH), 7.18-7.24 (m, 4H, PhH), 6.83 (d, J=6.8 Hz, 2H, PhH), 4.66 (s, 2H, CH₂), 3.77 (br s, 2H, NCH₂), 3.68 (br s, 2H, NCH₂), 3.65 (s, 4H, CON(CH₂)₂) ppm.

HRMS: calcd for C₂₃H₂₁ClFN₆O₃ 483.13477, found 483.13334.

Example 168

Synthesis of 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorophenyl)-5-methyl-oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone

This compound was prepared from example 162 in a yield of 93%, according to the procedure for the synthesis of example 47.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.13-8.18 (m, 2H, PhH), 7.27 (d, J=8.9 Hz, 2H, PhH), 7.20 (t, J=8.5 Hz, 2H, PhH), 6.93 (d, J=8.9 Hz, 2H, PhH), 4.76 (s, 2H, CH₂), 4.27 (br s, 4H, N(CH₂)₂), 3.78 (br s, 4H, CON(CH₂)₂), 2.59 (s, 3H, CH₃) ppm.

HRMS: calcd for C₂₄H₂₂ClFN₅O₃ 482.13952, found 482.13800.

Example 169

Synthesis of 1-(4-(5-amino-2-(4-fluorophenyl)oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone

This compound was prepared from example 163 in a yield of 55%, according to the procedure for the synthesis of example 47.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.03-8.08 (m, 2H, PhH), 7.40 (t, J=8.8 Hz, 2H, PhH), 7.33 (d, J=8.8 Hz, 2H, PhH), 6.98 (d, J=8.8 Hz, 2H, PhH), 6.54 (s, 2H, NH₂), 4.93 (s, 2H, CH₂), 4.19 (br s, 2H, NCH₂), 4.09 (br s, 2H, N(CH₂)₂), 3.62 (br s, 4H, CON(CH₂)₂) ppm.

HRMS: calcd for C₂₃H₂₁ClFN₆O₃ 483.13477, found 483.13367.

Example 170

Synthesis of 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorobenzyl)oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone

This compound was prepared from example 164 in a yield of 58%, according to the procedure for the synthesis of example 47.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.33 (s, 1H, CH), 7.30-7.35 (m, 2H, PhH), 7.26 (d, J=6.8 Hz, 2H, PhH), 7.03 (t, J=8.7 Hz, 2H, PhH), 6.91 (d, J=6.8 Hz, 2H, PhH), 4.74 (s, 2H, OCH₂), 4.17 (s, 2H, CH₂), 4.17 (br s, 4H, N(CH₂)₂), 3.75 (br s, 4H, CON(CH₂)₂) ppm.

HRMS: calcd for C₂₄H₂₂ClFN₃O₃ 482.13952, found 482.13796.

Example 171

Synthesis of 2-(4-chlorophenoxy)-1-(4-(2-(4-fluorobenzyl)-5-methyloxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone

This compound was prepared from example 165 in a yield of 68%, according to the procedure for the synthesis of example 47.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.25 (d, J=8.9 Hz, 2H, PhH), 7.10-7.15 (m, 2H, PhH), 6.99 (t, J=8.5 Hz, 2H, PhH), 6.86 (d, J=8.9 Hz, 2H, PhH), 4.67 (s, 2H, OCH₂), 3.66 (br s, 4H, N(CH₂)₂), 3.55 (s, 2H, CH₂), 3.53 (br s, 4H, CON(CH₂)₂), 2.61 (s, 3H, CH₃) ppm.

Example 172

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)oxazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone

This compound was prepared from example 166 in a yield of 34%, according to the procedure for the synthesis of example 47.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.26 (d, J=8.9 Hz, 2H, PhH), 7.14-7.19 (m, 2H, PhH), 6.96 (t, J=8.7 Hz, 2H, PhH), 6.91 (d, J=8.9 Hz, 2H, PhH), 4.78 (s, 2H, NH₂), 4.73 (s, 2H, CH₂), 4.11 (br s, 4H, N(CH₂)₂), 3.68 (br s, 4H, CON(CH₂)₂), 3.07 (br s, 4H, CH₂CH₂) ppm.

Example 173

Synthesis of N-(3-chloro-4-fluorophenyl)-2-(4-fluorophenyl)-oxazolo[5,4-d]pyrimidin-7-amine

To a solution of 7-chloro-2-(4-fluorophenyl)-oxazolo[5,4-d]pyrimidine (85 mg, 0.34 mmol) in 1,2-dichloroethane/t-BuOH (1:1, 2 ml) was added 3-chloro-4-fluoroaniline (50 mg, 0.34 mmol). The mixture was heated at 90° C. for 1 day. After cooling down to room temperature, the solvent was removed under reduced pressure. The crude residue was purified by silica gel chromatography (CH₂Cl₂/MeOH 50:1) to yield the title compound as a white solid (0.1 g, 82%).

¹H NMR (300 MHz, DMSO, 25° C.): δ=10.52 (s, 1H, NH), 8.55 (s, 1H, CH), 8.23-8.27 (m, 2H, PhH), 7.84-7.87 (m, 1H, PhH), 7.50 (t, J=8.8 Hz, 2H, PhH), 7.43 (t, J=9.1 Hz, 1H, PhH) ppm.

HRMS: calcd for C₁₇H₁₀ClF₂N₄O 359.05112, found 359.05016.

Example 174

Synthesis of N-7-(3-chloro-4-fluorophenyl)-2-(4-fluorophenyl)-oxazolo[5,4-d]pyrimidine-5,7-diamine

This compound was prepared from example 163 in a yield of 32%, according to the procedure for the synthesis of example 173.

¹H NMR (300 MHz, DMSO, 25° C.): δ=10.00 (s, 1H, NH), 8.22-8.26 (m, 1H, PhH), 8.08-8.12 (m, 2H, PhH), 7.95-7.99 (m, 1H, PhH), 7.44 (t, J=8.8 Hz, 2H, PhH), 7.35 (t, J=9.1 Hz, 1H, PhH), 6.81 (s, 2H, NH₂) ppm.

HRMS: calcd for C₁₇H₁₁ClF₂N₅O 374.06202, found 374.06101.

Examples 175-179

Synthesis of 5-amino-7-chloro-2-substituted-oxazolo[5,4-d]pyrimidine analogues

General Procedure

To a suspension of a 2-amino-4,6-dihydroxy-5-substituted pyrimidine analogue (3.0 mmol) in toluene (20 ml) were added DIPEA (1.19 ml, 9 mmol) and POCl₃ (830 μl, 9 mmol) respectively. The resulting mixture was heated at 95° C. for 2 h. The solvents were evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of acetone and dichloromethane (in a ratio of 1/50), yielding the pure title compounds.

The following compounds were synthesized according to this procedure:

Example 175

Synthesis of 5-amino-7-chloro-2-cyclopropyloxazolo[5,4-d]pyrimidine

This compound was obtained from 2-amino-4,6-dihydroxy-5-(cyclopropanamido)pyrimidine (630 mg, 3.0 mmol) yielding the pure title compound (550 mg, 87%).

MS m/z (%): 211 ([M+H]⁺, 100)

Example 176

Synthesis of 5-amino-7-chloro-2-methoxymethyloxazolo[5,4-d]pyrimidine

From 2-amino-4,6-dihydroxy-5-methoxyacetamidopyrimidine (642 mg, 3.0 mmol), yielding the pure title compound (430 mg, 67%).

MS m/z (%): 215 ([M+H]⁺, 100)

Example 177

Synthesis of 5-amino-7-chloro-2-cyclohexyloxazolo[5,4-d]pyrimidine

From 2-amino-4,6-dihydroxy-5-cyclohexanecarboxamidopyrimidine (760 mg, 3.0 mmol), yielding the pure title compound (390 mg, 51%).

MS m/z (%): 253 ([M+H]⁺, 100)

Example 178

Synthesis of 5-amino-7-chloro-2-pentyloxazolo[5,4-d]pyrimidine

From 2-amino-4,6-dihydroxy-5-hexanamidopyrimidine (720 mg, 3.0 mmol), yielding the pure title compound (480 mg, 67%).

MS m/z (%): 241 ([M+H]⁺, 100)

Example 179

Synthesis of 5-amino-7-chloro-2-(2-phenylethyl)oxazolo[5,4-d]pyrimidine

From 2-amino-4,6-dihydroxy-5-phenylpropanamidopyrimidine (686 mg, 2.5 mmol), yielding the pure title compound (320 mg, 46%).

MS m/z (%): 276 ([M+H]⁺, 100)

Examples 180-184

Synthesis of 5-amino-7-N-piperazino-2-substituted oxazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of the 5-amino-7-chloro-2-substituted oxazolo[5,4-d]pyrimidine (420 mg, 2.0 mmol) in dioxane (10 ml), was added piperazine (860 mg, 10 mmol). The resulting mixture was stirred at room temperature for 12 h. The mixture was evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/6), yielding the pure title compounds.

The following compounds were synthesized according to this general procedure:

Example 180

Synthesis of 5-amino-2-cyclopropyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine

This compound was obtained in 92% yield from 5-amino-7-chloro-2-cyclopropyl-oxazolo[5,4-d]pyrimidine.

MS m/z (%): 261 ([M+H]⁺, 100)

Example 181

Synthesis of 5-amino-2-methoxymethyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine

This compound was obtained in 57% yield from 5-amino-7-chloro-2-methoxymethyl-oxazolo[5,4-d]pyrimidine.

MS m/z (%): 265 ([M+H]⁺, 100)

Example 182

Synthesis of 5-amino-2-cyclohexyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine

This compound was obtained in 97% yield from 5-amino-7-chloro-2-cyclohexyloxazolo[5,4-d]pyrimidine.

MS m/z (%): 303 ([M+H]⁺, 100)

Example 183

Synthesis of 5-amino-2-pentyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine

This compound was obtained in 86% yield from 5-amino-7-chloro-2-pentyloxazolo[5,4-d]pyrimidine.

MS m/z (%): 291 ([M+H]⁺, 100)

Example 184

Synthesis of 5-amino-2-(2-phenylethyl)-7-N-piperazino-oxazolo[5,4-d]pyrimidine

This compound was obtained in 99% yield from 5-amino-7-chloro-2-(2-phenylethyl)oxazolo[5,4-d]pyrimidine.

MS m/z (%): 325 ([M+H]⁺, 100)

Examples 185-189

Synthesis of 5-amino-2-substituted-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-oxazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of a 5-amino-2-substituted-7-N-piperazino-oxazolo[5,4-d]pyrimidine analogue (1.0 mmol) in dioxane (10 ml), was added DIPEA (330 μl, 2.0 mmol) and 4-chlorophenoxyacetyl chloride (246 mg, 1.2 mmol), respectively. The resulting mixture was stirred at room temperature for 30 minutes. The solvents were evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/40), yielding the pure title compounds.

The following compounds were synthesized according to this procedure:

Example 185

Synthesis of 5-amino-2-cyclopropyl-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-oxazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-cyclopropyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine in 93% yield.

MS m/z (%): 429 ([M+H]⁺, 100)

Example 186

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-methoxylmethyloxazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-methoxymethyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine in 60% yield.

MS m/z (%): 433 ([M+H]⁺, 100)

Example 187

Synthesis of 5-amino-2-cyclohexyl-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]oxazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-cyclohexyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine in 73% yield.

MS m/z (%): 471 ([M+H]⁺, 100)

Example 188

Synthesis of 5-amino-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]-2-pentyloxazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-pentyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine in 71% yield.

MS m/z (%): 459 ([M+H]⁺, 100)

Example 189

Synthesis of 5-amino-2-(2-phenylethyl)-7-[4-(4-chlorophenoxyacetyl)piperazin-1-yl]oxazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-pentyl-7-N-piperazino-oxazolo[5,4-d]pyrimidine in 85% yield.

MS m/z (%): 493 ([M+H]⁺, 100)

Examples 190-192

Synthesis of 5-amino-2-(4-fluorophenyl)-7-piperazin-1-yl-oxazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of 5-amino-7-chloro-2-(4-fluorophenyl)-oxazolo[5,4-d]pyrimidine X (50 mg, 0.19 mmol) in dioxane (5 ml) was added diisopropylethylamine (0.28 mmol, 47 μL) and a piperazine derivative (0.28 mmol). The reaction was stirred at 70° C. for 6 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 2% CH₃OH in CH₂Cl₂), yielding the pure title compounds which were characterized by their mass spectra as indicated below:

The following compounds were synthesized according to this procedure:

Example 190

Synthesis of 5-amino-2-(4-fluorophenyl)-7-(4-isobutylpiperazin-1-yl)-oxazolo[5,4-d]pyrimidine

This compound was obtained from 1-isobutyl-piperazine (32 mg);

MS m/z (%): 371 ([M+H]⁺, 100).

Example 191

Synthesis of 5-amino-2-(4-fluorophenyl)-7-(4-acetylpiperazin-1-yl)-oxazolo[5,4-d]pyrimidine

This compound was obtained from 1-acetyl piperazine (27 mg).

MS m/z (%): 357 ([M+H]⁺, 100).

Example 192

Synthesis of 5-amino-2-(4-fluorophenyl)-7-[4-(2-methoxyethyl)-piperazin-1-yl]-oxazolo[5,4-d]pyrimidine

This compound was obtained from 1-(2-methoxyethyl) piperazine (30 mg).

MS m/z (%): 373 ([M+H]⁺, 100).

Example 193

Synthesis of 5-amino-2-(4-fluorophenyl)-7-(4-[2-(3-nitrophenoxy)acetyl]-piperazin-1-O-oxazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-(4-fluorophenyl)-7-piperazin-1-yl-oxazolo[5,4-d]pyrimidine (50 mg, 0.15 mmol) and 2-(3-nitrophenoxy)acetic acid (0.22 mmol) in DMF (2 ml) was added TBTU (0.22 mmol) followed by diisopropylethylamine (0.22 mmol, 36 μL). The reaction was stirred at room temperature for 24 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compound which was characterized by its mass spectrum: MS m/z (%): 522 ([M+H]⁺, 100).

Examples 194-195

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-alkylacetyl]piperazin-1-yl)-oxazolo[5,4-d]pyrimidine

General Procedure

To a solution of 5-amino-2-(4-fluorophenyl)-7-piperazin-1-yl-oxazolo[5,4-d]pyrimidine (50 mg, 0.15 mmol) in dichloromethane (4 ml) was added diisopropylethylamine (0.32 mmol, 53 μL) followed by an acyl chloride (0.16 mmol). The reaction was stirred at room temperature for 16 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 1% CH₃OH in CH₂Cl₂), yielding the pure title compounds which were characterized by their mass spectra as indicated below.

The following compounds were synthesized according to this procedure:

Example 194

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[2-(4-chlorophenyl)acetyl]-piperazin-1-yl)-oxazolo[5,4-d]pyrimidine

This compound was obtained from 4-chlorophenylacetyl chloride (57 mg);

MS m/z (%): 495 ([M+H]⁺, 100).

Example 195

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[4-chlorobenzoyl]piperazin-1-yl)-oxazolo[5,4-d]pyrimidine

This compound was obtained from 4-chlorobenzoyl chloride (62 mg).

MS m/z (%): 481 ([M+H]⁺, 100).

Example 196

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-m-tolylcarbamoylpiperazin-1-yl)-oxazolo[5,4-d]pyrimidine

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-piperazin-1-yl-oxazolo[5,4-d]pyrimidine (50 mg, 0.15 mmol) in dichloromethane (4 ml) was added 3-methylphenylisocyanate (0.16 mmol). The reaction was stirred at room temperature for 2 hours after which the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 2% CH₃OH in CH₂Cl₂), yielding the pure title compound (30 mg) which was characterized by its mass spectrum: MS m/z (%): 476 ([M+H]⁺, 100).

Examples 197-198

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-alkylpiperazin-1-yl)-oxazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of 5-amino-2-[2-(4-fluorophenyl)ethyl]-6H-oxazolo[5,4-d]pyrimidin-7-one (50 mg, 0.18 mmol) in DMF (2 ml) was added DBU (0.27 mmol), BOP (0.23 mmol) and a piperazine derivative (0.23 mmol). The reaction mixture was stirred at room temperature for 16 hours whereupon the solvent was removed in vacuo. The resulting residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually ranging from 100% CH₂Cl₂ to 2% CH₃OH in CH₂Cl₂), yielding the pure title compounds which were characterized by their mass spectra as indicated below.

The following compounds were made according to this general procedure:

Example 197

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-(2-phenoxyethyl)piperazin-1-yl)-oxazolo[5,4-d]pyrimidine

This compound was obtained from 1-(2-phenoxyethyl)-piperazine (57 mg).

MS m/z (%): 463 ([M+H]⁺, 100).

Example 198

Synthesis of 5-amino-2-[2-(4-fluorophenyl)ethyl]-7-(4-[(methylphenyl-carbamoyl)methyl]piperazin-1-yl)-oxazolo[5,4-d]pyrimidine

This compound was obtained from N-methyl-N-phenyl-2-piperazin-1-yl-acetamide (27 mg).

MS m/z (%): 371 ([M+H]⁺, 100).

Examples 199-201

Synthesis of 2-amino-5-acylamino-4,6-dihydroxypyrimidine analogues

General Procedure

To a solution of 2,5-diamino-4,6-dihydroxypyrimidine (1 g, 5.6 mmol) in water (15 ml) was added sodium hydroxide (17 mmol, 672 mg) and an appropriate acid chloride (6.72 mmol) at 0° C. The reaction was then stirred at room temperature for 3 hours. The reaction mixture was acidified till pH=5. A light pink precipitate was formed, which was filtered off yielding the pure title compounds, in yields varying from 85-95%.

The following compounds were made according to this procedure:

Example 199

Synthesis of 2-amino-5-benzamido-4,6-dihydroxypyrimidine

This compound was synthesized according to the general procedure using benzoyl chloride.

¹H NMR (300 MHz, DMSO): δ=10.82 (br s, 2H, 2×OH), 8.73 (s, 1H, arom H), 7.9 (m, 2H, arom H), 7.45 (m, 3H, arom H), 6.97 (br s, 2H, NH₂) ppm.

Example 200

Synthesis of 2-amino-5-(2-furancarboxamido)-4,6-dihydroxypyrimidine

This compound was synthesized according to the general procedure using 2-furoyl chloride

¹H NMR (300 MHz, DMSO): δ=10.67 (br s, 2H, 2×OH), 8.56 (s, 1H, arom H), 7.81 (s, 1H, arom H), 7.16 (s, 1H, arom H), 6.65 (br s, 2H, NH₂) ppm.

Example 201

Synthesis of 2-amino-5-(4-fluorobenzamido)-4,6-dihydroxypyrimidine

This compound was synthesized according to the general procedure using 4-fluorobenzoyl chloride

Examples 202-204

Synthesis of 5-amino-2-substituted-thiazolo[5,4-d]pyrimidine-7-thiol analogues

General Procedure

A suspension of the appropriate 2-amino-4,6-dihydroxy-5-(acylamino)pyrimidine analogue (4.24 mmol) and P₂S₅ (8.47 mmol, 3.77 g) in pyridine (20 ml) was heated under reflux for 12 hours. After concentration under reduced pressure, the residue was resuspended in water (15 ml). Potassium carbonate (1.76 g, 13 mmol) was added and the mixture was stirred at room temperature for 1 h. The precipitate was collected by filtration and washed with water, yielding the crude title compound which was used without further purification.

The following compounds were synthesized according to this procedure:

Example 202

Synthesis of 5-amino-2-phenyl-thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-5-benzamido-4,6-dihydroxypyrimidine

Example 203

Synthesis of 5-amino-2-(2-furyl)-thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-5-(2-furancarboxamido)-4,6-dihydroxypyrimidine

Example 204

Synthesis of 5-amino-2-(4-fluoro-phenyl)-thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from 2-amino-5-(4-fluorobenzamido)-4,6-dihydroxypyrimidine

Examples 205-207

Synthesis of 5-amino-7-N-piperazinyl-2-substituted-thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of a 5-amino-2-substituted-thiazolo[5,4-d]pyrimidine-7-thiol analogue (3.37 mmol) in pyridine (20 ml) was added 1,1,1,3,3,3-hexamethyldisilazane (HMDS, 6.1 ml) and piperazine (33.7 mmol, 2.9 g). The reaction mixture was refluxed overnight. After cooling down to room temperature, the solvents were evaporated in vacuo. The residue was adsorbed on silica and purified by silica gel flash chromatography, the mobile phase being a mixture of methanol and dichloromethane (in a gradient gradually raising from 8% to 9% methanol in dichloromethane), yielding the title compounds as yellow powders, in yields ranging from 40-50%.

The following compounds were made according to this procedure:

Example 205

Synthesis of 5-amino-2-phenyl-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-phenyl-thiazolo[5,4-d]pyrimidine-7-thiol.

Example 206

Synthesis of 5-amino-2-(2-furyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(2-furyl)-thiazolo[5,4-d]pyrimidine-7-thiol.

Example 207

Synthesis of 5-amino-2-(4-fluoro-phenyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine

This compound was synthesized from 5-amino-2-(4-fluoro-phenyl)-thiazolo[5,4-d]pyrimidine-7-thiol.

Examples 208-214

Synthesis of 5-amino-7-N-(acylpiperazinyl)-2-substituted-thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of a 5-amino-7-N-piperazinyl-2-substituted-thiazolo[5,4-d]pyrimidine analogue (0.65 mmol) in DMF (10 ml) was added diisopropylamine (1.3 mmol, 215 μl), O-(benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate (TBTU, 0.78 mmol, 251 mg) and an appropriate carboxylic acid (0.78 mmol). The reaction was stirred at room temperature for 2 hours. An extraction was carried out (water/dichloromethane) and the solvents were evaporated in vacuo. The residue was purified by silica gel flash chromatography, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually raising from 1% to 1.5% methanol in dichloromethane), yielding pure final compounds in yields varying from 70 to 80%.

The following compounds were made according to this procedure:

Example 208

Synthesis of 1-(4-(5-amino-2-phenylthiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone

This compound was obtained from 5-amino-2-phenyl-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 4-methoxy-phenoxyacetic acid.

¹H NMR (300 MHz, DMSO): δ=7.91 (m, 2H, arom H), 7.49 (m, 3H, arom H), 6.87 (q, 4H, arom H), 6.51 (br s, 2H, NH₂), 4.81 (s, 2H, CH₂), 4.36 (br s, 2H, piperazine H), 4.21 (br s, 2H, piperazine H), 3.68 (s, 3H, OCH₃), 3.62 (br s, 4H, piperazine H) ppm.

Example 209

Synthesis of 1-(4-(5-amino-2-(furan-2-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-fluorophenoxy)ethanone

This compound was obtained from 5-amino-2-(2-furyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 4-fluoro-phenoxyacetic acid.

¹H NMR (300 MHz, DMSO): δ=7.91 (s, 1H, arom H), 7.10-7.14 (m, 3H, arom H), 6.96-6.98 (m, 2H, arom H), 6.72 (q, 1H, arom H), 6.52 (br s, 2H, NH₂), 4.89 (s, 2H, CH₂), 4.33 (br s, 2H, piperazine H), 4.19 (br s, 2H, piperazine H), 3.62 (br s, 4H, piperazine H) ppm.

Example 210

Synthesis of 1-(4-(5-amino-2-(furan-2-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(m-tolyloxy)ethanone

This compound was obtained from 5-amino-2-(2-furyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 3-methyl-phenoxyacetic acid.

¹H NMR (300 MHz, DMSO): δ=7.89 (s, 1H, arom H), 7.13-7.16 (m, 2H, arom H), 6.72-6.78 (m, 4H, arom H), 6.49 (br s, 2H, NH₂), 4.85 (s, 2H, CH₂), 4.32 (br s, 2H, piperazine H), 4.18 (br s, 2H, piperazine H), 3.63 (br s, 4H, piperazine H), 2.27 (s, 3H, CH₃) ppm.

Example 211

Synthesis of 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(m-tolyloxy)ethanone

This compound was obtained from 5-amino-2-(4-fluoro-phenyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 3-methyl-phenoxyacetic acid.

¹H NMR (300 MHz, DMSO): δ=7.96-8.00 (m, 2H, arom H), 7.36 (t, 2H, arom H), 7.16 (t, 1H, arom H), 6.76-6.79 (m, 3H, arom H), 6.51 (br s, 2H, NH₂), 4.86 (s, 2H, CH₂), 4.35 (br s, 2H, piperazine H), 4.22 (br s, 2H, piperazine H), 3.65 (br s, 4H, piperazine H), 2.28 (s, 3H, CH₃) ppm.

Example 212

Synthesis of 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(2,4-dichlorophenoxy)ethanone

This compound was obtained from 5-amino-2-(4-fluoro-phenyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 2,4-dichloro-phenoxyacetic acid.

¹H NMR (300 MHz, DMSO): δ=7.95-8.00 (m, 2H, arom H), 7.58 (d, 2H, arom H), 7.36 (m, 3H, arom H), 7.01 (d, 1H, arom H), 6.52 (br s, 2H, NH₂), 5.09 (s, 2H, CH₂), 4.36 (br s, 2H, piperazine H), 4.22 (br s, 2H, piperazine H), 3.64 (br s, 4H, piperazine H) ppm.

Example 213

Synthesis of 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chloro-2-methylphenoxy)ethanone

This compound was obtained from 5-amino-2-(4-fluoro-phenyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 4-chloro-o-tolyl-oxyacetic acid.

¹H NMR (300 MHz, DMSO): δ=7.95-8.00 (m, 2H, arom H), 7.33-7.39 (t, 2H, arom H), 7.16-7.23 (m, 2H, arom H), 6.90 (d, 1H, arom H), 6.51 (br s, 2H, NH₂), 4.94 (s, 2H, CH₂), 4.35 (br s, 2H, piperazine H), 4.22 (br s, 2H, piperazine H), 3.64 (br s, 4H, piperazine H), 2.20 (s, 3H, CH₃) ppm.

Example 214

Synthesis of 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(3-chlorophenoxy)ethanone

This compound was obtained from 5-amino-2-(4-fluoro-phenyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 3-chloro-phenoxyacetic acid.

¹H NMR (300 MHz, DMSO): δ=7.97 (m, 2H, arom H), 7.36 (m, 3H, arom H), 6.93-6.99 (m, 3H, arom H), 6.51 (br s, 2H, arom H), 4.96 (s, 2H, CH₂), 4.36 (br s, 2H, piperazine H), 4.23 (br s, 2H, piperazine H), 3.64 (br s, 4H, piperazine H) ppm.

Example 215

Synthesis of 1-(4-(5-amino-2-phenylthiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone

To a solution of 5-amino-2-phenyl-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine (90 mg, 0.28 mmol) in dioxane (5 ml) was added triethylamine (0.86 mmol, 120 μl) and 4-chlorophenoxyacetyl chloride (0.35 mmol, 71 mg). The reaction was stirred at room temperature for 2 hours. The solvents were evaporated and the residue was purified by silica gel flash chromatography, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually raising from 1% to 2% methanol in dichloromethane), yielding the pure title compound.

¹H NMR (300 MHz, DMSO): δ=7.92 (m, 2H, arom H), 7.51 (m, 3H, arom H), 7.32-7.35 (m, 2H, arom H), 6.97-7.00 (m, 2H, arom H), 6.51 (br s, 2H, arom H), 4.93 (s, 2H, CH₂), 4.38 (br s, 2H, piperazine H), 4.22 (br s, 2H, piperazine H), 3.64 (br s, 4H, piperazine H) ppm.

Examples 216-220

Synthesis of 5-amino-7-N-(carbamoylpiperazinyl)-2-substituted-thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of a 5-amino-7-N-piperazinyl-2-substituted-thiazolo[5,4-d]pyrimidine analogue (0.61 mmol) in DMF (10 ml) was added diisopropylamine (1.2 mmol, 200 μl) and an appropriate isocyanate (0.91 mmol). The reaction was stirred at room temperature for 2 hours. The solvents were evaporated in vacuo. The residue was purified by silica gel flash chromatography, the mobile phase being a mixture of methanol and dichloromethane (in a ratio gradually raising from 1% to 1.5% methanol in dichloromethane), yielding pure final compounds in yields varying from 70 to 80%.

The following compounds were made according to this procedure:

Example 216

Synthesis of 4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-cyanophenyl)piperazine-1-carboxamide

This compound was obtained from 5-amino-2-(4-fluoro-phenyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 4-cyanophenylisocyanate.

¹H NMR (300 MHz, DMSO): δ=9.08 (s, 1H, NH), 7.95-7.99 (m, 2H, arom H), 7.70 (s, 4H, arom H), 7.37 (t, 2H, arom H), 6.51 (br s, 2H, NH₂), 4.31 (br s, 4H, piperazine H), 3.66 (br s, 4H, piperazine H) ppm.

Example 217

Synthesis of 4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(2,4-difluorophenyl)piperazine-1-carboxamide

This compound was obtained from 5-amino-2-(4-fluoro-phenyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 2,4-difluoro-phenylisocyanate.

¹H NMR (300 MHz, DMSO): δ=8.40 (s, 1H, NH), 7.97 (m, 2H, arom H), 7.36 (m, 5H, arom H), 7.04 (m, 1H, arom H), 6.50 (br s, 2H, NH₂), 4.30 (br s, 4H, piperazine H), 3.62 (br s, 4H, piperazine H) ppm.

Example 218

Synthesis of 4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-bromophenyl)piperazine-1-carboxamide

This compound was obtained from 5-amino-2-(4-fluoro-phenyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 4-bromo-phenylisocyanate.

¹H NMR (300 MHz, DMSO): δ=8.72 (s, 1H, NH), 7.95-7.98 (m, 2H, arom H), 7.43-7.48 (m, 6H, arom H), 6.49 (br s, 2H, NH₂), 4.30 (br s, 4H, piperazine H), 3.63 (br s, 4H, piperazine H) ppm.

Example 219

Synthesis of 4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(2-methoxyphenyl)piperazine-1-carboxamide

This compound was obtained from 5-amino-2-(4-fluoro-phenyl)-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 2-methoxy-phenylisocyanate.

Example 220

Synthesis of 4-(5-amino-2-phenylthiazolo[5,4-d]pyrimidin-7-yl)-N-m-tolylpiperazine-1-carboxamide

This compound was obtained from 5-amino-2-phenyl-7-N-piperazinyl-thiazolo[5,4-d]pyrimidine and 3-methyl-phenylisocyanate.

¹H NMR (300 MHz, DMSO): δ=8.52 (s, 1H, NH), 7.91 (dd, 2H, arom H), 7.50 (m, 3H, arom H), 7.32 (m, 2H, arom H), 7.12 (t, 1H, arom H), 6.76 (d, 1H, arom H), 6.52 (br s, 2H, NH₂), 4.30 (br s, 4H, piperazine H), 3.62 (br s, 4H, piperazine H), 2.26 (s, 3H, CH₃) ppm.

Example 221

Synthesis of 5-amino-7-(N-piperazin-1-yl)-2-(pyridine-3-yl)thiazolo[5,4-d]pyrimidine

A mixture of 5-amino-7-thiol-2-(pyridine-3-yl)thiazolo[5,4-d]pyrimidine (1.31 g, 5 mmol), piperazine (2.15 g, 25 mmol) and 1,1,1,3,3,3-hexamethyldisilazane (HMDS, 5 ml) in pyridine (40 ml) was heated in a microwave oven (CEM discover, 150° C., 150 W) for 30 minutes. The reaction mixture was evaporated in vacuo and purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/3), yielding the pure title compound as a yellowish solid (0.95 g, 60%).

MS m/z (%): 314 ([M+H]⁺, 100)

Example 222

Synthesis of 4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)-N-p-tolylpiperazine-1-carboxamide

To a suspension of 5-amino-7-(piperazin-1-yl)-2-(pyridine-3-yl)thiazolo[5,4-d]pyrimidine (150 mg, 0.48 mmol) in dioxane (10 ml) was added 4-tolyl isocyanate (63 μl, 0.5 mmol). The resulting reaction mixture was stirred at room temperature for 30 minutes. The solvents were evaporated in vacuo and the residue was purified by flash chromatography on silica, the mobile phase being a mixture of methanol and dichloromethane (in a ratio of 1/25), yielding the pure title compound as a yellowish solid (170 mg, 79%).

MS m/z (%): 447 ([M+H]⁺, 100)

Example 223

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-3-(4-bromophenyl)propan-1-one

This compound was prepared from example 27 using 3-(4-bromophenyl)propionic acid in a yield of 71%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.42 (d, 2H, PhH), 7.10-7.24 (m, 4H, PhH), 6.96 (t, 2H, PhH), 4.69 (s, 2H, NH₂), 4.17 (br s, 4H, N(CH₂)₂), 3.71 (br s, 2H, NCH₂), 3.47 (br s, 2H, NCH₂), 3.23 (t, 2H, CH₂), 3.07 (t, 2H, CH₂), 2.97 (t, 2H, CH₂), 2.65 (t, 2H, CH₂) ppm.

Example 224

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-hydroxyphenoxy)ethanone

This compound was prepared from example 27 using 4-hydroxyphenoxyacetic acid in a yield of 12%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.13-7.18 (m, 2H, PhH), 6.96 (t, 2H, PhH), 6.75-6.87 (m, 4H, PhH), 4.71 (s, 2H, NH₂), 4.69 (s, 2H, OCH₂), 4.25 (br s, 2H, NCH₂), 4.21 (br s, 2H, NCH₂), 3.70 (br s, 4H, N(CH₂)₂), 3.23 (t, 2H, CH₂), 3.07 (t, 2H, CH₂) ppm.

Example 225

Synthesis of methyl 4-(2-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-oxoethoxy)benzoate

This compound was prepared from example 27 using 4-methoxycarbonylphenoxyacetic acid in a yield of 41%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=8.01 (d, 2H, PhH), 7.13-7.18 (m, 2H, PhH), 7.01 (d, 2H, PhH), 6.96 (t, 2H, PhH), 4.81 (s, 2H, OCH₂), 4.71 (s, 2H, NH₂), 4.25 (br s, 2H, NCH₂), 4.20 (br s, 2H, NCH₂), 3.88 (s, 3H, CH₃), 3.73 (br s, 2H, NCH₂), 3.65 (br s, 2H, NCH₂), 3.23 (t, 2H, CH₂), 3.07 (t, 2H, CH₂) ppm

Example 226

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-(trifluoromethoxy)phenoxy)ethanone

This compound was prepared from example 27 using 4-trifluoromethoxyphenoxyacetic acid in a yield of 54%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.13-7.18 (m, 4H, PhH), 6.93-6.99 (m, 4H, PhH), 4.75 (s, 2H, OCH₂), 4.71 (s, 2H, NH₂), 4.26 (br s, 2H, NCH₂), 4.21 (br s, 2H, NCH₂), 3.72 (br s, 2H, NCH₂), 3.65 (br s, 2H, NCH₂), 3.23 (t, 2H, CH₂), 3.07 (t, 2H, CH₂) ppm

Example 227

Synthesis of 2-(4-acetylphenoxy)-1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)ethanone

This compound was prepared from example 27 using 4-acetylphenoxyacetic acid in a yield of 67%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.97 (d, 2H PhH), 7.13-7.18 (m, 4H, PhH), 6.93-7.04 (m, 4H, PhH), 4.82 (s, 2H, OCH2), 4.71 (s, 2H, NH2), 4.25 (br s, 2H, NCH2), 4.20 (br s, 2H, NCH2), 3.72 (br s, 2H, NCH2), 3.65 (br s, 2H, NCH2), 3.23 (t, 2H, CH2), 3.07 (t, 2H, CH2), 2.56 (s, 3H, CH3) ppm

Example 228

Synthesis of 1-(4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(3-chlorophenoxy)ethanone

This compound was prepared from example 27 using 3-chlorophenoxyacetic acid in a yield of 51%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.00-7.23 (m, 3H, PhH), 6.93-6.99 (m, 4H, PhH), 6.87 (d, 1H, PhH), 4.73 (s, 2H, OCH₂), 4.72 (s, 2H, NH₂), 4.26 (br s, 2H, NCH₂), 4.22 (br s, 2H, NCH₂), 3.71 (t, 2H, NCH₂), 3.64 (t, 2H, NCH₂), 3.23 (t, 2H, CH₂), 3.07 (t, 2H, CH₂) ppm

Example 229

Synthesis of 4-(5-amino-2-(4-fluorophenethyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-cyanophenyl)piperazine-1-carboxamide

This compound was prepared from example 27 using 4-cyanophenyl isocyanate in a yield of 64%, according to the procedure for the synthesis of example 42.

¹H NMR (300 MHz, DMSO, 25° C.): δ=9.06 (s, 1H, NH), 7.69 (s, 4H, PhH), 7.28-7.33 (m, 2H, PhH), 7.10 (t, 2H, PhH), 6.30 (s, 2H, NH₂), 4.20 (br s, 4H, N(CH₂)₂), 3.59 (br s, 4H, N(CH₂)₂) 3.26 (t, 2H, CH₂), 3.05 (t, 2H, CH₂) ppm.

Example 230

Synthesis of 1-(4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone

This compound was prepared from example 26 using 4-methoxyphenoxyacetic acid in a yield of 59%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.23-7.28 (m, 2H, PhH), 7.02 (t, 2H, PhH), 8.82-6.93 (m, 4H, PhH), 4.78 (s, 2H, NH₂), 4.70 (s, 2H, OCH₂), 4.28 (br s, 4H, N(CH₂)₂), 4.21 (s, 2H, CH₂), 3.77 (s, 3H, CH₃), 3.73 (br s, 4H, N(CH₂)₂) ppm

Example 231

Synthesis of 1-(4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone

This compound was prepared from example 26 using 4-bromophenoxyacetic acid in a yield of 80%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.40 (d, 2H, PhH), 7.23-7.27 (m, 2H, PhH), 7.02 (t, 2H, PhH), 6.87 (d, 2H, PhH), 4.78 (s, 2H, NH₂), 4.73 (s, 2H, OCH₂), 4.28 (br s, 4H, N(CH₂)₂), 4.21 (s, 2H, CH₂), 3.67-3.72 (m, 4H, N(CH₂)₂) ppm

Example 232

Synthesis of 4-(5-amino-2-(4-fluorobenzyl)thiazolo[5,4-d]pyrimidin-7-yl)-N-(4-cyanophenyl)piperazine-1-carboxamide

This compound was prepared from example 26 using 4-cyanophenyl isocyanate in a yield of 58%, according to the procedure for the synthesis of example 42.

¹H NMR (300 MHz, DMSO, 25° C.): δ=9.06 (s, 1H, NH), 7.69 (s, 4H, PhH), 7.37-7.42 (m, 2H, PhH), 7.18 (t, 2H, PhH), 6.33 (s, 2H, NH₂), 4.29 (s, 2H, CH2), 4.22 (br s, 4H, N(CH₂)₂), 3.60 (br s, 4H, N(CH₂)₂) ppm.

Example 233

Synthesis of 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-fluorophenoxy)ethanone

This compound was prepared from example 25 using 4-fluorophenoxyacetic acid in a yield of 58%, according to the procedure for the synthesis of example 50.

¹H NMR (500 MHz, DMSO, 25° C.): δ=7.95-7.98 (m, 2H PhH), 7.35 (t, 2H, PhH), 7.11 (t, 2H, PhH), 6.95-6.98 (m, 2H PhH), 6.51 (s, 2H, NH₂), 4.88 (s, 2H, CH₂), 4.35 (br s, 2H NCH₂), 4.21 (br s, 2H, NCH₂), 3.63 (br s, 4H N(CH₂)₂) ppm

Example 234

Synthesis of 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone

This compound was prepared from example 25 using 4-methoxyphenoxyacetic acid in a yield of 95%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.95-8.00 (m, 2H, PhH), 7.35 (t, 2H, PhH), 6.84-6.92 (m, 4H, PhH), 6.51 (s, 2H, NH₂), 4.81 (s, 2H, OCH₂), 4.33 (br s, 2H, NCH₂), 4.21 (br s, 2H, NCH₂), 3.69 (s, 3H, CH₃), 3.64 (br s, 4H, N(CH₂)₂) ppm.

Example 235

Synthesis of 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone

This compound was prepared from example 25 using 4-bromophenoxyacetic acid in a yield of 47%, according to the procedure for the synthesis of example 50.

¹H NMR (500 MHz, DMSO, 25° C.): δ=7.95-7.98 (m, 2H PhH), 7.47 (d, 2H, PhH), 7.35 (t, 2H, PhH), 6.92 (d, 2H, PhH), 6.50 (s, 2H, NH₂), 4.91 (s, 2H, CH₂), 4.37 (br s, 2H NCH₂), 4.21 (br s, 2H, NCH₂), 3.63 (br s, 4H N(CH₂)₂) ppm.

Example 236

Synthesis of 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-3-(4-fluorophenyl)propan-1-one

This compound was prepared from example 25 using 3-(4-fluorophenyl)propionic acid in a yield of 62%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.85-7.89 (m, 2H, PhH), 7.11-7.22 (m, 4H, PhH), 6.98 (t, 2H, PhH), 4.84 (s, 2H, NH₂), 4.29 (br s, 4H, N(CH₂)₂), 3.78 (t, 2H, NCH₂), 3.55 (t, 2H, NCH₂), 3.00 (t, 2H, CH₂), 2.67 (t, 2H, CH₂) ppm.

Example 237

Synthesis of 1-(4-(5-amino-2-(4-fluorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)-2-methylpropan-1-one

This compound was prepared from example 25 using 2-(4-chlorophenoxy)-2-methylpropanoic acid in a yield of 58%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, DMSO, 25° C.): δ=7.94-7.98 (m, 2H, PhH), 7.32-7.38 (m, 4H, PhH), 6.87 (d, 2H, PhH), 6.46 (s, 2H, NH₂), 4.14 (br s, 2H, NCH₂), 3.93 (br s, 4H, N(CH₂)₂), 3.68 (br s, 2H, NCH₂), 1.56 (s, 6H, CH₃, CH₃) ppm.

Examples 238-240

Synthesis of 2-amino-4,6-dihydroxy-5-(acylamino)pyrimidine analogues

General Procedure

A suspension of a carboxylic acid (6.7 mmol) in SOCl₂ (5 ml) was heated under reflux for 1 h. After concentration under reduced pressure, the residue was redissolved in dioxane (5 ml) and added to a stirring solution of 2,5-diamino-4,6-dihydroxypyrimidine hydrochloride (1.0 g, 5.6 mmol) in 1 N NaOH (20 ml) at 0° C. The mixture was stirred and warmed to room temperature over 1 hour. After neutralization with 1 N hydrochloric acid to pH=5, the precipitate was filtered off, washed with water and dried over P₂O₅, yielding the title compound.

The following compounds were synthesized according to this procedure:

Example 238

Synthesis of N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-3-(3-methoxyphenyl)propanamide

This compound was synthesized using 3-(3-methoxyphenyl)propionic acid, yielding the title compound in 87% yield.

Example 239

Synthesis of N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-3-(3,4-dimethoxyphenyl)propanamide

This compound was synthesized using 3-(3,4-dimethoxyphenyl)propionic acid, yielding the title compound in 46% yield.

Example 240

Synthesis of N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-3-p-tolylpropanamide

This compound was synthesized using 3-(4-tolyl)propionic acid, yielding the title compound in 67% yield.

Examples 241-243

Synthesis of 5-amino-2-substituted-thiazolo[5,4-d]pyrimidine-7-thiol analogues

General Procedure

A suspension of a 2-amino-4,6-dihydroxy-5-N-acylamino-pyrimidine analogue (3.3 mmol) and P₂S₅ (1.68 g, 7.6 mmol) in pyridine (15 ml) was heated under reflux for 6 hours. After concentration under reduced pressure, the residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 30:1), yielding the title compounds as a yellow solid.

The following compounds were synthesized according to this procedure:

Example 241

Synthesis of 5-amino-2-(3-methoxyphenethyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-3-(3-methoxyphenyl)propanamide, yielding the title compound in 82% yield.

Example 242

Synthesis of 5-amino-2-(3,4-dimethoxyphenethyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-3-(3,4-dimethoxyphenyl)propanamide, yielding the title compound in 48% yield.

MS m/z (%): 349 ([M+H]⁺, 100)

Example 243

Synthesis of 5-amino-2-(4-methylphenethyl)thiazolo[5,4-d]pyrimidine-7-thiol

This compound was synthesized from N-(2-amino-4,6-dihydroxypyrimidin-5-yl)-3-p-tolylpropanamide, yielding the title compound in 76% yield.

Examples 244-246

Synthesis of 5-amino-2-substituted-7-methylthio-thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of 5-amino-2-substituted-thiazolo[5,4-d]pyrimidine-7-thiol (2.4 mmol) and triethylamine (0.83 ml, 5.97 mmol) in DMSO (10 ml) was added iodomethane (0.29 ml, 4.77 mmol). The reaction mixture was stirred for 12 h under N₂ at 25° C. The mixture was poured into water and extracted with EtOAc. The organic extracts were dried over Na₂SO₄ and the solvents were removed under reduced pressure. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 80:1), yielding the title compound as a light yellow solid.

The following compounds were synthesized according to this procedure:

Example 244

Synthesis of 2-(3-methoxyphenethyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from 5-amino-2-(3-methoxyphenethyl)thiazolo[5,4-d]pyrimidine-7-thiol, yielding the title compound in 73% yield.

Example 245

Synthesis of 2-(3,4-dimethoxyphenethyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from 5-amino-2-(3,4-dimethoxyphenethyl)thiazolo[5,4-d]pyrimidine-7-thiol, yielding the title compound in 96% yield.

Example 246

Synthesis of 2-(4-methylphenethyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from 5-amino-2-(4-methylphenethyl)thiazolo[5,4-d]pyrimidine-7-thiol, yielding the title compound in 55% yield.

Examples 247-249

Synthesis of 5-amino-2-substituted-7-methylsulfonyl-thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of a 2-substituted-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine analogue (0.90 mmol) in dichloromethane (5 ml) was added mCPBA (70%, 0.39 g, 2.26 mmol) at 0° C. The reaction mixture was stirred for 3 hours, whereby the reaction temperature was gradually increased from 0° C. to room temperature. The reaction mixture was diluted with CHCl₃ and was washed with a saturated NaHCO₃ solution, brine and dried over Na₂SO₄. After removing the solvents under reduced pressure, the residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 50:1), affording the title compound.

The following compounds were synthesized according to this procedure:

Example 247

Synthesis of 2-(3-methoxyphenethyl)-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from 2-(3-methoxyphenethyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine, yielding the title compound in 85% yield.

Example 248

Synthesis of 2-(3,4-dimethoxyphenethyl)-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from 2-(3,4-dimethoxyphenethyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine, yielding the title compound in 69% yield.

Example 249

Synthesis of 2-(4-methylphenethyl)-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from 2-(4-methylphenethyl)-7-(methylthio)thiazolo[5,4-d]pyrimidin-5-amine, yielding the title compound in 51% yield.

Examples 250-252

Synthesis of 5-amino-2-substituted-7-piperazinyl-thiazolo[5,4-d]pyrimidine analogues

General Procedure

To a solution of a 2-substituted-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine analogue (0.55 mmol) and triethylamine (0.12 ml, 0.82 mmol) in dioxane (4 ml) was added piperazine (71 mg, 0.82 mmol). The reaction mixture was heated at 60° C. for 5 hours. After cooling, the volatiles were removed under reduced pressure. The crude residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 15:1), furnishing the title compound.

The following compounds were synthesized according to this procedure:

Example 250

Synthesis of 2-(3-methoxyphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from 2-(3-methoxyphenethyl)-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine, yielding the title compound in 98% yield.

Example 251

Synthesis of 2-(3,4-dimethoxyphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from 2-(3,4-dimethoxyphenethyl)-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine, yielding the title compound in 89% yield.

Example 252

Synthesis of 2-(4-methylphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized from 2-(4-methylphenethyl)-7-(methylsulfonyl)thiazolo[5,4-d]pyrimidin-5-amine, yielding the title compound in 79% yield.

Example 253

Synthesis of 1-(4-(5-amino-2-(3-methoxyphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone

This compound was prepared from 2-(3-methoxyphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine using 4-methoxyphenoxyacetic acid in a yield of 66%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.22 (t, 1H, PhH), 6.81-6.93 (m, 4H, PhH), 6.73-6.81 (m, 3H, PhH), 4.76 (s, 2H, NH₂), 4.69 (s, 2H, OCH₂), 4.25 (br s, 2H, NCH₂), 4.19 (br s, 2H, NCH₂), 3.77 (s, 3H, CH₃), 3.76 (s, 3H, CH₃), 3.69 (br s, 4H, N(CH₂)₂), 3.25 (t, 2H, CH₂), 3.07 (t, 2H, CH₂) ppm.

Example 254

Synthesis of 1-(4-(5-amino-2-(3-methoxyphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone

This compound was prepared from 2-(3-methoxyphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine using 4-bromophenoxyacetic acid in a yield of 65%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): b=7.39 (d, 2H PhH), 7.20 (t, 1H, PhH), 6.86 (d, 2H, PhH), 6.73-6.81 (m, 3H, PhH), 4.77 (s, 2H, NH₂), 4.72 (s, 2H, OCH₂), 4.25 (br s, 2H, NCH₂), 4.19 (br s, 2H, NCH₂), 3.77 (s, 3H, CH₃), 3.70 (br s, 2H, NCH₂), 3.64 (br s, 2H, NCH₂), 3.25 (t, 2H, CH₂), 3.07 (t, 2H, CH₂) ppm.

Example 255

Synthesis of 1-(4-(5-amino-2-(3-methoxyphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone

This compound was prepared from 2-(3-methoxyphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine using 4-chlorophenoxyacetic acid in a yield of 48%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): b=7.26 (d, 2H, PhH), 7.20 (t, 1H, PhH), 6.92 (d, 2H PhH), 6.73-6.82 (m, 3H, PhH), 4.73 (s, 2H, OCH₂), 4.71 (2, 2H, NH₂), 4.26 (br s, 2H, NCH₂), 4.20 (br s, 2H, NCH₂), 3.78 (s, 3H, CH₃), 3.70 (br s, 2H, NCH₂), 3.67 (br s, 2H, NCH₂), 3.26 (t, 2H, CH₂), 3.07 (t, 2H, CH₂) ppm.

Example 256

Synthesis of 1-(4-(5-amino-2-(3,4-dimethoxyphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone

This compound was prepared from 2-(3,4-dimethoxyphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine using 4-bromophenoxyacetic acid in a yield of 74%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.39 (d, 2H, PhH), 6.87 (d, 2H, PhH), 6.72-6.78 (m, 3H, PhH), 4.73 (s, 2H, OCH₂), 4.69 (s, 2H, NH₂), 4.24 (br s, 4H, N(CH₂)₂), 3.85 (s, 6H, CH₃, CH₃), 3.71 (br s, 2H, NCH₂), 3.65 (br s, 2H, NCH₂), 3.24 (t, 2H, CH₂), 3.04 (t, 2H, CH₂) ppm.

Example 257

Synthesis of 1-(4-(5-amino-2-(3,4-dimethoxyphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone

This compound was prepared from 2-(3,4-dimethoxyphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine using 4-methoxyphenoxyacetic acid in a yield of 71%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=6.73-6.93 (m, 7H, PhH), 4.76 (s, 2H, NH₂), 4.70 (s, 2H, OCH₂), 4.26 (br s, 2H, NCH₂), 4.22 (br s, 2H, NCH₂), 3.85 (s, 3H, CH₃), 3.84 (s, 3H, CH₃), 3.76 (s, 3H, CH₃), 3.71 (br s, 4H, N(CH₂)₂), 3.23 (t, 2H, CH₂), 3.04 (t, 2H, CH₂) ppm.

Example 258

Synthesis of 1-(4-(5-amino-2-(4-methylphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-bromophenoxy)ethanone

This compound was prepared from 2-(4-methylphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine using 4-bromophenoxyacetic acid in a yield of 47%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.39 (d, 2H, PhH), 7.10 (s, 4H, PhH), 6.87 (d, 2H, PhH), 4.73 (s, 2H, OCH₂), 4.70 (s, 2H, NH₂), 4.27 (br s, 2H, NCH₂), 4.20 (br s, 2H, NCH₂), 3.64-3.72 (m, 4H, N(CH₂)₂), 3.24 (t, 2H, CH₂), 3.06 (t, 2H, CH₂), 2.32 (s, 3H, CH₃) ppm.

Example 259

Synthesis of 1-(4-(5-amino-2-(4-methylphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone

This compound was prepared from 2-(4-methylphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine using 4-methoxyphenoxyacetic acid in a yield of 68%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.10 (s, 4H, PhH), 6.82-6.93 (m, 4H, PhH), 4.70 (s, 4H, NH₂, OCH₂), 4.27 (br s, 2H, NCH₂), 4.21 (br s, 2H, NCH₂), 3.76 (s, 3H, OCH₃), 3.70 (br s, 4H, N(CH₂)₂), 3.23 (t, 2H, CH₂), 3.05 (t, 2H, CH₂), 2.31 (s, 3H, CH₃) ppm

Example 260

Synthesis of 1-(4-(5-amino-2-(4-methylphenethyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-chlorophenoxy)ethanone

This compound was prepared from 2-(4-methylphenethyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine using 4-chlorophenoxyacetic acid in a yield of 51%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.26 (d, 2H, PhH), 7.10 (s, 4H, PhH), 6.92 (d, 2H, PhH), 4.73 (s, 2H, OCH₂), 4.71 (s, 2H, NH₂), 4.27 (br s, 2H, NCH₂), 4.20 (br s, 2H, NCH₂), 3.66-3.72 (m, 4H, N(CH₂)₂), 3.23 (t, 2H, CH₂), 3.05 (t, 2H, CH₂), 2.31 (s, 3H, CH₃) ppm.

Example 261

Synthesis of 4,6-dichloropyrimidine-2,5-diamine

A suspension of 2,5-diamino-4,6-dihydroxypyrimidine hydrochloride (5.0 g, 28 mmol) and tetraethylammonium chloride (27.8 g, 0.167 mmol) in phosphorus oxychloride (80 ml) was heated at 105° C. for 20 hours. After cooling down to room temperature, the excess phosphorus oxychloride was distilled off under vacuum. The reaction mixture was poured into ice water and the pH was adjusted to 4, and the mixture was stirred for 1 hour at 50° C. The pH was adjusted to 7 and the product was extracted with ethyl acetate, washed with a saturated NaHCO₃ solution, brine and dried over Na₂SO₄. After removing the solvents under reduced pressure, the residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 50:1), affording the title compound (3.21 g, 64%).

Examples 262-263

Synthesis of tert-butyl 4-(5-amino-2-substituted-6-chloropyrimidin-4-yl)piperazine-1-carboxylate analogues

General Procedure

To a solution of a 4,6-dichloropyrimidine analogue (11.2 mmol) and DIPEA (2.9 ml, 16.8 mmol) in dioxane (40 ml) was added tert-butyl piperazine-1-carboxylate (3.12 g, 16.8 mmol). The reaction mixture was heated at 100° C. for overnight. After cooling, the volatile was removed under reduced pressure. The crude residue was diluted with CHCl₃ and was washed with a saturated NaHCO₃ solution, brine and dried over Na₂SO₄. After removing the solvents under reduced pressure, the residue was purified by flash chromatography on silica (CH₂Cl₂/MeOH 50:1), affording the title compound.

The following compounds were synthesized according to this procedure:

Example 262

Synthesis of tert-butyl 4-(2,5-diamino-6-chloropyrimidin-4-yl)piperazine-1-carboxylate

This compound was synthesized from 2,5-diamino-4,6-dichloropyrimidine, yielding the title compound in 94% yield.

Example 263

Synthesis of tert-butyl 4-(5-amino-6-chloropyrimidin-4-yl)piperazine-1-carboxylate

This compound was synthesized from 5-amino-4,6-dichloropyrimidine, yielding the title compound in 91% yield.

Examples 264-265

Synthesis of tert-butyl 4-(5-amino-2-substituted-6-mercaptopyrimidin-4-yl)piperazine-1-carboxylate analogues

General Procedure

To a solution of a tert-butyl 4-(2,5-diamino-6-chloropyrimidin-4-yl)piperazine-1-carboxylate analogue (6.1 mmol) in DMSO (15 ml) was added sodium sulfide nonahydrate (2.9 g, 12.1 mmol). The reaction mixture was heated at 50° C. overnight. After cooling down to room temperature, water (15 ml) was added and the solution was evaporated under reduced pressure. The crude residue was diluted with water (20 ml) and neutralized with HCl. The precipitate was collected by filtration, washed with water and dried over P₂O₅, yielding the title compound.

The following compounds were synthesized according to this procedure:

Example 264

Synthesis of tert-butyl 4-(2,5-diamino-6-mercaptopyrimidin-4-yl)piperazine-1-carboxylate

This compound was synthesized from tert-butyl 4-(2,5-diamino-6-chloropyrimidin-4-yl)piperazine-1-carboxylate, yielding the title compound in 61% yield.

Example 265

Synthesis of tert-butyl 4-(5-amino-6-mercaptopyrimidin-4-yl)piperazine-1-carboxylate

This compound was synthesized from tert-butyl 4-(5-amino-6-chloropyrimidin-4-yl)piperazine-1-carboxylate, yielding the title compound in 80% yield.

Examples 266-269

Synthesis of 7-(piperazin-1-yl)-2-substituted-thiazolo[5,4-d]pyrimidin-5-amine analogues

General Procedure

To a solution of a tert-butyl 4-(6-mercaptopyrimidin-4-yl)piperazine-1-carboxylate analogue (6.1 mmol) in DMSO (10 ml) was added an appropriate aldehyde (2.36 mmol). The reaction mixture was heated at 150° C. for 1 hour. After cooling down to room temperature, the mixture was diluted with ethyl acetate and washed with water, brine and dried over Na₂SO₄. After removing the solvents under reduced pressure, the residue was diluted with dichloromethane (5 ml) and treated with TFA (1.6 ml, 21.4 mmol). The reaction mixture was stirred at room temperature overnight. The volatiles were evaporated under reduced pressure and the residue was diluted with water and neutralized with 1N NaOH. The precipitate was collected by filtration, washed with water and dried over P₂O₅, yielding the title compound.

The following compounds were synthesized according to this procedure:

Example 266

Synthesis of 7-(piperazin-1-yl)-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized using nicotinaldehyde, yielding the title compound in 56% yield.

Example 267

Synthesis of 7-(piperazin-1-yl)-2-(pyridin-2-yl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized using picolinaldehyde, yielding the title compound in 44% yield.

Example 268

Synthesis of 7-(piperazin-1-yl)-2-(pyridin-4-yl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized using isonicotinaldehyde, yielding the title compound in 46% yield.

Example 269

Synthesis of 2-(4-chlorophenyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine

This compound was synthesized using 4-chlorobenzaldehyde, yielding the title compound in 60% yield.

Example 270

Synthesis of 1-(4-(5-amino-2-(4-chlorophenyl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone

This compound was prepared from 2-(4-chlorophenyl)-7-(piperazin-1-yl)thiazolo[5,4-d]pyrimidin-5-amine using 4-methoxyphenoxyacetic acid in a yield of 63%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, CDCl₃, 25° C.): δ=7.82 (d, 2H, PhH), 7.43 (d, 2H, PhH), 6.83-6.94 (m, 4H, PhH), 4.80 (s, 2H, NH₂), 4.72 (s, 2H, CH₂), 4.37 (br s, 2H, NCH₂), 4.32 (br s, 2H, NCH₂), 3.77 (s, 7H, CH₃, N(CH₂)₂) ppm.

Example 271

Synthesis of 1-(4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-yl)-2-(4-methoxyphenoxy)ethanone

This compound was prepared from 7-(piperazin-1-yl)-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-5-amine using 4-methoxyphenoxyacetic acid in a yield of 52%, according to the procedure for the synthesis of example 50.

¹H NMR (300 MHz, DMSO, 25° C.): δ=9.14 (s, 1H, 2-pyridyl-H), 8.66 (d, J=4.7 Hz, 1H, 4-pyridyl-H), 8.30 (d, J=5.5 Hz, 1H, 6-pyridyl-H), 7.53-7.57 (m, 1H, 5-pyridyl-H), 6.84-6.93 (m, 4H, PhH), 6.58 (s, 2H, NH₂), 4.81 (s, 2H, OCH₂), 4.34 (br s, 2H, CH₂), 4.23 (br s, 2H, CH₂), 3.70 (s, 3H, CH₃), 3.66 (br s, 4H, CH₂) ppm.

Example 272

Synthesis of 1-(4-(5-amino-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-7-yl)piperazin-1-O-2-(4-fluorophenoxy)ethanone

This compound was prepared from 7-(piperazin-1-yl)-2-(pyridin-3-yl)thiazolo[5,4-d]pyrimidin-5-amine using 4-fluorophenoxyacetic acid in a yield of 67%, according to the procedure for the synthesis of example 50

¹H NMR (300 MHz, DMSO, 25° C.): b=9.14 (d, J=2.0 Hz, 1H, 2-pyridyl-H), 8.66 (d, J=3.6 Hz, 1H, 4-pyridyl-H), 8.29 (d, J=8.0 Hz, 1H, 6-pyridyl-H), 7.53-7.57 (m, 1H, 5-pyridyl-H), 7.12 (t, J=8.9 Hz, 2H, PhH), 6.95-6.99 (m, 2H, PhH), 6.58 (s, 2H, NH₂), 4.89 (s, 2H, OCH₂), 4.37 (br s, 2H, CH₂), 4.24 (br s, 2H, CH₂), 3.66 (br s, 4H, CH₂) ppm.