The present invention relates to a process for preparing (R)-4-cyano-3-hydroxybutyric acid ester derivatives and more particularly, to a process for preparing optically pure (R)-4-cyano-3-hydroxybutyric acid ester derivatives expressed by formula (1) in high yield by performing cyanation and sequential esterification of (S)-3,4-epoxybutyric acid salt as a starting material. In said formula, R represents linear or branched alkyl group with 1˜5 carbon atoms or benzyl group.
本发明涉及一种制备(R)-4-
氰基-3-羟基
丁酸酯衍
生物的方法,更具体地,涉及一种通过对(S)-3,4-环氧
丁酸盐进行
氰化和顺序酯化的方法,以高收率制备公式(1)所表示的光学纯(R)-4-
氰基-3-羟基
丁酸酯衍
生物。在公式中,R代表具有1〜5个碳原子的线性或支链烷基或苄基。