A process for enriching or improving the optical purity of an asymmetric epoxidation reaction mixture is provided wherein one chiral epoxy alcohol enantiomer, preferably the one present in minor amounts, is effectively separated from the other chiral epoxy alcohol enantiomer by converting the former to an epoxy ester by stereoselective transesterification using a carboxylic acid derivative such as an enol ester and a lipase enzyme and then recovering the desired chiral epoxy alcohol enantiomer or reacting it in situ to form a chiral epoxy alcohol derivative.
本发明提供了一种富集或提高不对称环氧化反应混合物光学纯度的工艺,其中一种手性环氧醇对映体,最好是少量存在的手性环氧醇对映体,通过使用
羧酸衍
生物(如烯醇酯)进行立体选择性酯交换反应,将前者转化为环氧酯,从而与另一种手性环氧醇对映体有效分离、利用
羧酸衍
生物(如烯醇酯)和
脂肪酶,通过立体选择性酯交换反应将前者转化为环氧酯,然后回收所需的手性环氧醇对映体或使其就地反应生成手性环氧醇衍
生物,从而有效地从另一种手性环氧醇对映体中分离出来。