申请人:Brown Martin Stephen
公开号:US20060100457A1
公开(公告)日:2006-05-11
A process for the preparation of gamma-cyahlothrin comprising a) chlorinating 1R cis-Z 3-(2-chloro-3,3,3-triflu-oro-1-propenyl)-2,2-dimethyl cyclopropanecarboxylic acid to give 1R cis-Z 3-(2-chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethyl cy-clopropanecarboxylic acid chloride; b) esterifying 1R cis-Z 3-(2-chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethyl cyclopropanecarboxylic acid chloride with 3-phenoxy benzaldehyde in the presence of a source of cyanide to form a diastereoisomeric mixture of cyhalothrin isomers and c) epimerising the diastereoisomeric mixture under conditions in which the least soluble diastereoisomer crystallises from solution.
制备gamma-氯氰菊酯的过程包括:a)氯化1R顺式-Z 3-(2-氯-3,3,3-三氟-1-丙烯基)-2,2-二甲基环丙烷羧酸,得到1R顺式-Z 3-(2-氯-3,3,3-三氟-1-丙烯基)-2,2-二甲基环丙烷羧酸氯化物;b)在氰源的存在下,用3-苯氧基苯甲醛酯化1R顺式-Z 3-(2-氯-3,3,3-三氟-1-丙烯基)-2,2-二甲基环丙烷羧酸氯化物,形成氰戊菊酯异构体的对映体混合物;c)在最不溶的对映体从溶液中结晶的条件下,对映体混合物进行对映异构化。