A CONVENIENT AND EFFICIENT ASYMMETRIC SYNTHESIS OF (S)-α-ARYLTHIOMETHYL-α-HYDROXYBUTYRIC ACID ESTERS
作者:Yun-Yan Kuang、Fen-Er Chen
DOI:10.1080/00304940509354885
日期:2005.4
exploration of new synthetic approaches to 20(S)-camptothecins,' we envisioned the possiblility of developing a total asymmetric total synthesis of 20(S)-camptothecins employing (S)-a-arylthiomethyl-a-hydroxybutyric acid esters (9a,b) as key chiral building blocks for the construction of E-ring unit of 20(S)-camptothecins. Herein, we describe a convenient asymmetric preparation of 9a,b starting from