Process for converting a stereoisomeric ester into its diastereoisomer; crystalline (-)-S-alpha-cyano-3-phenoxybenzyl (+)-S-alpha-isopropyl-4-chlorophenylacetate
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0002289A1
公开(公告)日:1979-06-13
A process for the conversion of (+)-R-alpha-cyano-3-phenoxybenzyl (+)-S-alpha-isopropyl-4-chlorophenylacetate (isomer 1) into (-)-S-alpha-cyano-3-phenoxybenzyl (+)-S-alpha-isopropyl-4-chlorophenylacetate (isomer 2), by treating a solution in a suitable solvent of isomer 1, alone or in admixture with isomer 2 with a base, and by removing a proportion of isomer 2 before, during or after the treatment with base.
一种将(+)-R-alpha-氰基-3-苯氧基苄基(+)-S-alpha-异丙基-4-氯苯乙酸酯(异构体 1)转化为(-)-S-alpha-氰基-3-苯氧基苄基(+)-S-alpha-异丙基-4-氯苯乙酸酯(异构体 2)的工艺、用碱处理异构体 1(单独或与异构体 2 混合)在适当溶剂中的溶液,并在碱处理之前、期间或之后除去一定比例的异构体 2。