申请人:BASF Aktiengesellschaft
公开号:US05264580A1
公开(公告)日:1993-11-23
A process for preparing isoxazole-3,4-dicarboxylic acid derivatives of the formula I ##STR1## where R.sup.1 is hydrogen, alkyl, cycloalkyl or phenyl, or a 5- to 6-membered heterocyclic radical, and the organic radicals can have substituents which are inert under the reaction conditions; R.sup.2 is hydrogen, alkyl, cycloalkyl, benzyl or C.sub.3 -C.sub.6 -alkenyl; A is NR.sup.3 R.sup.4 where R.sup.3 is hydrogen or an aliphatic or cycloaliphatic radical and R.sup.4 is an aliphatic or cycloaliphatic radical or unsubstituted or substituted phenyl, or R.sup.3 forms together with R.sup.4 a 4- to 7-membered alkylene chain which can be interrupted by oxygen, sulfur or N-methyl, or is OR.sup.5 where R.sup.5 is alkyl, cycloalkyl, benzyl or alkenyl; by deprotonation of a CH-acid compound of the formula II ##STR2## using a base and reacting with hydroximyl chlorides of the formula III ##STR3## wherein a magnesium alcoholate of the formula IV Mg(OR.sup.6 ).sub.2 IV where R.sup.6 is an aliphatic or cycloaliphatic radical is used for the deprotonation.
一种制备式I的异噁唑-3,4-二羧酸衍生物的方法,其中R.sup.1是氢,烷基,环烷基或苯基,或者是5-至6-成员的杂环基,有机基团可以具有在反应条件下惰性的取代基; R.sup.2是氢,烷基,环烷基,苄基或C.sub.3-C.sub.6-烯基; A是NR.sup.3R.sup.4,其中R.sup.3是氢或脂肪族或环状脂肪基,R.sup.4是脂肪族或环状脂肪基或未取代或取代的苯基,或者R.sup.3与R.sup.4一起形成4-至7-成员的烷基链,该链可以被氧,硫或N-甲基中断,或者是OR.sup.5,其中R.sup.5是烷基,环烷基,苄基或烯基; 通过使用碱去质子化式II的CH-酸化合物,并与式III的羟肟基氯化物反应,其中使用公式IV Mg(OR.sup.6).sub.2 IV,其中R.sup.6是脂肪族或环状脂肪基的镁醇盐进行去质子化。