Formal Synthesis of (−)-Cephalotaxine Based on a Tandem Hydroamination/Semipinacol Rearrangement Reaction
作者:Qing-Wei Zhang、Kai Xiang、Yong-Qiang Tu、Shu-Yu Zhang、Xiao-Ming Zhang、Yu-Ming Zhao、Tian-Cai Zhang
DOI:10.1002/asia.201101029
日期:2012.5
Catalytic asymmetric formal synthesis of (−)‐cephalotaxine has been accomplished based on an efficient tandem intramolecular hydroamination/asymmetric semipinacol rearrangement reaction catalyzed by chiral silver phosphate. During the course of the study it was observed that an advanced intermediate could be obtained in enantiopure form by enantiomer separation on silica gel.
(-)-头孢他辛的催化不对称形式合成已基于手性磷酸银催化的高效串联分子内加氢胺化/不对称半频哪醇重排反应而完成。在研究过程中,观察到通过在硅胶上对映异构体分离可以得到对映纯形式的高级中间体。