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.