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.
Synthesis and configurational assignment of optically active 1-hydroxyindolizidines
作者:Constance M. Harris、Thomas M. Harris
DOI:10.1016/s0040-4039(00)96147-1
日期:1987.1
The four diastereomers of 1-hydroxyindolizidine have been prepared in high optical purity (>98%) by NaBH4 reduction of the (+) and (-) 3-bromocamphor-8-sulfonic acid salts of 1-oxoindolizidine followed by separation of the resulting diastereomeric alcohols by ion-exchange chromatography.