申请人:Burroughs Wellcome Co.
公开号:US04289711A1
公开(公告)日:1981-09-15
A novel process is described for the preparation of compounds of formula ##STR1## wherein R.sup.2 and R.sup.3 are each chloro or bromo; X is carboxyl, nitrile, optionally substituted carbonamide, carbonyl halide or an ester group. Those compounds wherein X is an appropriate ester group --COOB where B is an aryl group such as m-phenoxybenzyl are known insecticides; compounds where X is other than --COOB may be suitably converted thereto. The novel process consists of a series of steps from the corresponding acetyl compound of formula ##STR2## which comprises halogenation, reduction, esterification and finally elimination reactions.
描述了一种新颖的过程,用于制备具有以下化学式的化合物##STR1##其中R.sup.2和R.sup.3分别是氯或溴;X是羧基、腈基、可选择取代的碳酰胺基、羰基卤化物或酯基。其中X为适当酯基--COOB的化合物,其中B是芳基,如m-苯氧基苯甲基,已知是杀虫剂;其中X不是--COOB的化合物可以适当转化为该酯基。该新颖过程由一系列步骤组成,从具有以下化学式的相应乙酰化合物开始##STR2##其中包括卤代反应、还原、酯化和最终消除反应。