Benzoyl-ureas exerting an insecticide activity
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in which one out of R and R 1 is F or Cl and the other is H, F or Cl;
X is a 1,4-phenylene or pyridyl bound in positions 2 and 5, optionally substituted;
Y is a phenyl, 2- or 3-pyridyl, optionally substituted.
The compounds of formula I are endowed with a high insecticide activity which is mainly directed against insect larvae and eggs.，下面是Benzoyl-ureas exerting an insecticide activity专利的具体信息内容。
This invention relates to benzoyl-urea derivatives having an insecticide activity and, more particularly, it relates to derivatives of 1-benzoyl-3-aryl-urea which are particularly active against eggs and larvae of insects harmful in the agrarian and civil field, and to the use thereof.
This invention relates furthermore to the synthesis process for preparing these ureas and to some new intermediates for the synthesis.
Various derivatives of 1-benzoyl-3-aryl-urea endowed with an insecticid.e activity are already known.
Among these, the first product in commerce is Diflubenzuron, a trade designation for the compound 1-(2,6-difluorobenzoyl)-3-(4-chlorophenyl)-urea described in US patent No. 3,993,908 (U.S. Phillips Corporation).
The Diflubenzuron, however, since it contains the unit of 4-chloro-aniline in the molecule, is suspected of being cangerogenic [European Chem. News 6 (16), 29 (1978)]
Among the various 1-benzoyl-3-aryl-urea derivatives endowed with an insecticide activity appeared in literature there may be cited the benzoyl-phenyl-urea substituted in the phenyl radical with an ethynyl, which are described in European patent application No. 38,766 (Ciba-Geigy).
The Applicant has now found new derivatives of 1--benzoyl-3-aryl-urea, which are the object of the present invention, having the general formula :
- one out of R and R is a fluorine or chlorine atom and the other is an atom of hydrogen, of fluorine or of chlor ine,
- X is a 1,4-phenylene or a pyridyl bound in position 2 to group NH and in position 5 to group -C≡C- or vice versa, said 1,4-phenylene or pyridyl groups being optionally substituted by one or two substituents selected from amongst atoms of fluorine and chlorine, groups CF3, OCF3, OCHF2, CN, N(R2)2 (R2 = alkyl C1-C4), alkyl C1-C4, alkoxy C1-C4, alkylthio C1-C4;
- Y is a phenyl or a 2- or 3-pyridyl, said phenyl or pyridyl groups being optionally substituted by from 1 to 4 substituents selected from fluorine and chlorine atoms, groups CF3, OCF3, OCHF2' NO2, CN, N(R2)2 (R2 = alkyl C1-C4), alkyl C 1-C4, alkoxy C1-C4, alkylthio C1-C4, alkenyl C2-C5, alkenyloxy C2-C5, alkenylthio C2-C5, alkylcarbonyl or alkoxycarbonyl having 1 to 4 carbon atoms in the alkyl moiety, aminocarbonyl, or dialkylaminocarbonyl having from 1 to 4 carbon atoms in each alkyl substituent.
The compounds of formula I are endowed with an insecticide activity and are suited to be employed in the agrarian and civil field against infestations due to insects.
Examples of compounds of formula I are the compounds having the following formulae :
The compounds of formula I are prepared by reacting a benzoyl-isocyanate of formula (II) :
H2N-X-C≡C-Y (III)
(in which X and Y are the same as indicated for formula I)
The reaction does not require the presence of a catalyst and is carried out in an inert solvent at a temperature ranging from 0°C to the boiling temperature of the reaction mixture.
Suitable solvents are aromatic hydrocarbons, chlorinated bydrocarbons, ethers, ketones and acetonitrile.
The benzoyl-isocyanates of formula II are known com pounds readily preparable and in some cases commercially available.
The amines of formula III are new compounds and, as such, constitute a further object of the invention.
They are prepared by reacting an aromatic amine (aniline, 2- or 3-amino-pyridine, optionally substituted by the substituents of group X in formula III), substitut ed in para with respect to the amino group by an atom of bromine or of iodine, by an aryl-acetylene (in which the aryl is group Y of formula III).
For the sake of simplicity, there is described in detail the preparation of a compound of formula III in which X is a non-substituted 1,4-phenylene and Y is an optionally substituted phenyl, i.e. a compound having the formula :
The preparation of compound III-A is accomplished by reacting a 4-halogen-substituted aniline (IV) with an op tionally substituted phenylacetylene (V) according to the reaction :
Reaction 1 is carried out in a basic solvent, for example triethylamine, at a temperature ranging from the room temperature to the boiling temperature of the reaction mixture, in an inert gas atmosphere and in the presence of catalytic amounts of palladium-bis-triphenylphosphine dichloride Pd[C6H5)3P]2Cl2 and optionally of cupreous iodide (CuI).
Similar reactions, but on different substrates are described in Italian patent No. 1,006,879 (Montedison S. p.A.), in Tetrahedron Letters 50, 4467 (1975); Journal of Organometallic Chemistry 93, 253 (1975) and 93, 259 (1975).
While 4-bromo or 4-iodo-aniline is a known and easily available compound, aryl-acetylene of formula V, depending on the meanings of substituent R3, may require a specific preparation.
Different modalities may be followed for preparing the compounds of formula V which directly derive from reactions known in the chemistry of the aryl-acetylenes.
Out of these modalities there may be cited : a, the reaction between acetylene and a halobenzene (bromo- or preferably iodo-benzene) optionally substituted.
Instead of acetylene as such it is preferable to use a protected acetylene in the form of trimethyl-ethyn nyl-silane, or in the form of 1,1-dimethyl-propargyl alcohol.
The reaction with halobenzene is followed by the release of the alkyne from the protective group.
An example of a reaction scheme is the following :
Reaction 2 is conducted according to the operative modalities described for reaction 1. Reactions analogous with reactions 2 and 3 have been described in Synthesis 364 (1981).
b. The bromination and double dehydrobromination reaction conducted on a styrene of formula :
Owing to the simplicity of the operative modalities, to the best yields and the easy availability of the start ing products it is generally preferred to prepare the phenylacetylenes of formula V according to the reactions indicated at point a.
As is apparent to those skilled in the art, the amines of formula III can be prepared according to alternative synthesis modalities, such as e.g. the reactions reported hereinafter :
Reaction 4 is analogous with reaction 1, but is carried out on 4-halo-nitrobenzene instead of on 4-halo-aniline of formula IV. The nitro-derivative VI is then reduced to the corresponding aniline (reaction 5) according to known techniques for example with sodium sulphite or tin chloride.
As an alternative, it is possible to adopt the same modalities of reaction 1 but on substrates having the functional groups inverted, and namely according to the following reaction :
The preparation of the anilines of formula III can be also accomplished by reacting a 4-bromo- or 4-iodo--aniline with a copper acetylide of formula :
Analogous reactions but on different substrates have been described in literature for example by C.E. Castro et al., Journal Org. Chem. 31, 4071 (1966).
As far as concerns the preparation of benzoyl--ureas, it is known in literature that the synthesis can be also carried out by reacting an aryl-isocyanate with a benzamide.
In the specific case relating to the preparation of the compounds of formula I, this reaction is represent ed by the following equation :
In principle it is certainly possible to prepare the compounds of formula I according to reaction 7, which is experimentally carried out in like manner as the condensation between benzoyl-isocyanate (II) and the aromatic amine (III).
However, the preparation of the isocyanates of form ula (VIII) must be accomplished by reaction of an amine of formula (III) with phosgene. This aspect, combined with the fact that the benzoyl-isocyanates of formula (II are available like the amides of formula (VII), leads to generally prefer the synthesis method previously described rather than the method of reaction 7.
As already mentioned, the compounds of formula I are endowed with a high insecticide activity which is chiefly exerted against insect larvae and eggs.
Among the insects, it is possible to fight with the compounds of formula I in particular those belonging to the Diptera, Lepidoptera and Coleoptera orders.
These orders include several species which are important due to their harmfulness in the agrarian, for- estal, civil and veterinary fields. Therefore the compounds of formula I are suited to various uses such as, for example, the defence of the agricultural cultivations from infestations caused by phytophagous insects, the protection of places infested by flies and mosquitos, the protection of breeding animals against some cattle parasites, etc.
The compounds of formula I exhibit moreover a collateral acaricide activity.
For practical uses, the compounds of general formula I can be employed as such or, more advantageously, in the form of compositions containing, besides one or more of the compounds of formula I as an active substance, also solid or liquid inert vehicles and optionally other additives. According to the usual formulative practice, the compositions may be in the form of wettable powders, emulsifiable concentrates and the like.
The amount of active substance in the compositions varies over a wide range (1-95% by weight) depending on the composition type and on the use it is intended for.
If required by particular situations or with a view to extending the action range, it is possible to add to the compositions other active substances, such as e.g. other insecticides or acaricides.
The amount of active substance (compound of formula I) to be distributed for the insecticide treatments depends on various factors, such as for example the infestation type and degree, the substrate in which the infestation is present (agrarian cultivations,stretches of water and waterways, organic substrates of various nature), the type of composition utilized, climatic and environmental factors, available applicative means, etc. In general, amounts of active substance from 0.01 to 1 kg/ha are sufficient for a good disinfestation.
With a vieN to better illustrating the present invention, the following examples are given hereinbelow.
This examples relates to the preparation of aryl--acetylene derivatives and has the main object of showing the methodology for preparing said compounds - a few of which are already described in literature - according to an adaptation of the procedure described in Synthesis 364 (1981).
Preparation of 4-chloro-phenylacetylene:
There was prepared a mixture consisting of :
- - 9.5 g (0.04 moles) of 4-chloro-iodobenzene
- - 4.2 g (0.05 moles) of 1,1-dimethyl-propargyl alcohol
- - 0.3 g of palladium-bis-triphenylphosphine dichloride
- - 100 ml of triethylamine.
Nitrogen was caused to bubble into said mixture for about 15 minutes.
While maintaining the mixture in a nitrogen atmosphere, 180 mg of cupreous iodide were added.
An almost immediate formation of a precipitate was observed.
It was stirred at room temperature for about 12 hours.
It was diluted with ethyl ether (200 ml) and it was filtered.
Almost all the solvent was removed from the filtrate by evaporation at reduced pressure, and the residue was diluted with 150 ml of toluene.
2.5 g of ground NaOH were added to the resulting solution, and it was heated to reflux temperature for 4 hours.
After hot filtration, the solvent was removed from the filtrate by evaporation under reduced pressure.
4.6 g of 4-chloro-phenylacetylene in the form of a waxy solid were thus obtained.
1H - NMR (CDCl3, TMS)
δ(ppm) 2.3 (s, 1H)
7.3 (m, 4H, aromatic protons) s = singlet, m = multiplet.
By operating in like manner as described. hereinbefore, there were prepared the aryl-acetylenes of formula :
Preparation of 4-[(4-chlorophenyl)-ethynyl]--aniline
There was prepared a mixture consisting of :
- - 4.4 g (0.032 moles) of 4-chloro-phenylacetylene
- - 7.0 g (0.032 moles) of 4-iodo-aniline
- - 0.2 g of Pd[(C6H5)3P]2Cl2
- - 80 ml of triethylamine.
Nitrogen was caused to bubble into the mixture for about 15 minutes.
180 mg of cupreous iodide were added to the mixt-- ure kept under stirring in a nitrogen atmosphere, and the whole was maintained under stirring at room temperature for about 12 hours.
The reaction mixture was then diluted with ethyl ether (200 ml) and filtered.
The solvent was removed from the filtrate by evaporation under reduced pressure.
Thus, 5 g of the desired product in the form of a thick liquid wore obtained as residue.
By operating in like manner as is described herein before, starting from 4-iodo-aniline and from the suitable aryl-acetylene, the aromatic amines having the following formulae were prepared :
Preparation of 1-(2-chloro-benzoyl)-3-[4-(4-chloro-phenyl)-ethynyl]-phenylurea (Compound No. 1)
On conclusion of the addition, the mixture was heat ed at reflux for 2 hours.
A solid separated, which was gathered by filtration, washed with cold ethyl ether and dried.
2.4 g of the desired product (M.P. = 210-2120C) were obtained.
By operating in like manner as is described in example 3, the compounds of formula I indicated in the fol lowing Table 1 were prepared.
- (a) The elemental analysis of all the compounds is consistent with the assigned structure.
- (b) The melting points have not been corrected.
- (c) The preparation of compound No. 1 is described in detail in example 3.
Determination of the insecticide activity.
- Activity on Spodoptera littoralis (Lepidoptera) larvae.
- 1a. Immediate residual activity. Tobacco leaves were treated by mechanical spraying with a hydroacetonic solution of the product being tested at 10% by volume of acetone and cont aining a surfactant. After complete evaporation of the solvents, the leaves were infested with second age larvae of the Lepidopter. The infested leaves were kept in a properly conditioned ambient for the entire duration of the test. In the same manner there were infested and preserved tobacco leaves treated only with a hydroacetonic solution at 10% of acetone and with the surfactant, to be used as a. check. 10 days after the infestation and after having renewed the treated substrate at lea.st one time, the dead larvae were counted with respect to the check.
- 1b. Activity by topical application. Lepidopter larva.e at the begin of the last age were treated,by topical application onto the first urosternites, with a hydroacetonic solution (10% by volume of acetone) product to be tested. As a check, another group of larvae of the same age was analogously treated with a hydroacetonic solution not containing any active substance. The results were determined by counting the number of dead larvae and pupae and of adults normally emerged from the cocoon when in the check the energence from the cocoon was concluded.
- - Activity on Aedes aegypti (Diptera) larvae. Spring water (297 ml) was mixed with an acetonic solution (3 ml) of the product to be tested in a proper concentration. Into the resulting solution, 25 4-day old Dipter larvae were introduced and suitably fed. As a check, other larvae were introduced into a hydroacetonic solution (3 ml of acetone, 297 ml of spring water) without any active substance. Every 2-3 days there was determined the number of dead larvae and pupae and of adults normally emerged from the cocoon, until conclusion of the emergence from the cocoon of the insects in the check. The activity of the product being tested is expressed as per cent ratio of dead individuals in respect of the total number of treated individuals.
The insecticide activity in the tests cited hereinbefore is expressed according to the following scale of values:
The data relating to the insecticide activity at the indicated doses, expressed by means of the scale of values reported hereinabove, are recorded on the following Table 2.
diclosed in European patent application No. 38,766.
In the above formulae the various radicals have preferably the following definition.
- Alkyl C1-4: methyl, ethyl, propyl, i-propyl, butyl, i-butyl, sec.-butyl, tert.=butyl.
- Alkoxy C1-4: alkyl is defined as above.
In the more complex radicals as alkoxy carbonyl or alkyl carbonyl etc. alkyl (and also alkoxy) is defined as above.
Halogen is F or Cl.
Phenyl or the 2- or 3-pyridyl groups (Y) may be substituted by 1,2,3 or 4 of the mentioned radicals.
Alkenyl is e.g. vinyl, propenyl-1 or 2, the various butenyl or pentenyl residues; the same applies for alkenyloxy or -thio residues.
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