Practical Synthesis of Optically Pure Methyl (2<i>R</i>,3<i>S</i>)-2,3-Epoxybutanoate via Microbial Asymmetric Reduction of α-Chloroacetoacetate
作者:Hiroyuki Akita、Reiko Todoroki、Hiroshi Endo、Yoshinobu Ikari、Takeshi Oishi
DOI:10.1055/s-1993-25895
日期:——
Asymmetric reduction of ethyl α-chloroacetoacetate (3) with Baker's yeast followed by treatment with sodium ethoxide afforded a mixture of ethyl (2R,3S)-( 8) and (2S,3S)-2,3-epoxybutanoate (9) (8/9, 85:15), which could be converted into the optically pure methyl (2R,3S)-2,3-epoxybutanoate (25) via one recrystallization of the brucine salt of the diastereomeric mixture of the corresponding epoxy acid.
用贝克酵母不对称还原δ-氯乙酰乙酸乙酯(3),然后用乙醇钠处理,得到(2R,3S)-( 8)和(2S,3S)-2,3-环氧丁酸乙酯(9)的混合物(8/9,85:通过对相应环氧酸非对映异构体混合物的布鲁氨酸盐进行一次重结晶,可将其转化为光学纯度较高的 (2R,3S)-2,3-环氧丁酸甲酯 (25)。