(S)-α-cyano-3-phenoxybenzyl alcohol, which is the alcohol moiety of pyrethroids, effective insecticides, is prepared by reacting an ester of racemic (R,S)-a-cyano-3-phenoxybenzyl alcohol with an esterase, wherein the ester of (S)-α-cyano-3-phenoxybenzyl alcohol is predominantly hydrolyzed. Thus, asymmetric hydrolysis permits optical resolution of the (S)-isomer alcohol from the ester of its antipode efficiently. The esterase may be of microorganism or animal pancreas or liver.
(S)-α-
氰基-
3-苯氧基苄醇是有效
杀虫剂拟
除虫菊酯的醇基,其制备方法是将外消旋(R,S)-a-
氰基-
3-苯氧基苄醇的酯与
酯酶反应,其中(S)-α-
氰基-
3-苯氧基苄醇的酯主要被
水解。 因此,不对称
水解允许从其反式酯中有效地光学分辨出(S)-异构体醇。
酯酶可以是微
生物或动物胰腺或肝脏。