Enantiocontrolled Preparation of Indolizidines: Synthesis of (−)-2-Epilentiginosine and (+)-Lentiginosine
作者:Martin O. Rasmussen、Philippe Delair、Andrew E. Greene
DOI:10.1021/jo010298r
日期:2001.8.1
A highly stereoselective approach to (-)-2-epilentiginosine and (+)-lentiginosine has been developed based on a diastereofacially selective cycloaddition of dichloroketene with a chiral dienol ether. The two naturally occurring indolizidines are each obtained enantioselectively (> or = 99:1) in ca. 8.5% overall yield.
基于二氯乙烯与手性二烯醇醚的非对映选择性环加成,已经开发了对(-)-2-癫痫性肌苷和(+)-龙胆苷的高度立体选择性的方法。两种天然存在的吲哚唑烷各自在约1∶1中对映选择性地(>或= 99∶1)获得。总产率为8.5%。