Preparation of isoxazoleacetic acid or ester thereof
专利汇可以提供Preparation of isoxazoleacetic acid or ester thereof专利检索，专利查询，专利分析的服务。并且PURPOSE: To obtain the titled compound useful as an agricultural and horticultural germicide advantageously, by reacting an alkyl-3,5-dialkoxy-2,4-pentadienoate, etc. with hydroxylamine in the presence of an acid, and further hydrolyzing the reaction product if necessary.
CONSTITUTION: A compound of formula I or II or compounds of formulas I and II (R
2 and R
3 are lower alkyl) are reacted with hydroxylamine in the presence of an acid, e.g. hydrochloric acid, preferably at 50W120°C, to give a compound of formula III or IV or compounds of formulas III and IV. The resultant compound of formula III or IV or compounds of formulas III and IV are then hydrolyzed if necessary by the conventional method or subjected to the ester interchange to afford a compound of formula V (CH
2 CO
2 R
1 is at the 3- or 5-position of the isoxazole ring; R
1 is H, alkyl or alkenyl) readily in high yield. The resultant compound exhibits improved antimicrobial activity against various pathogenic germs of plants, particularly blast of rice plants, without phytotoxicity to the crops.
COPYRIGHT: (C)1982,JPO&Japio，下面是Preparation of isoxazoleacetic acid or ester thereof专利的具体信息内容。
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