Intramolecular Pyridine Activation−Dearomatization Reaction: Highly Stereoselective Synthesis of Polysubstituted Indolizidines and Quinolizidines
作者:Guillaume Barbe、Guillaume Pelletier、André B. Charette
DOI:10.1021/ol901264f
日期:2009.8.6
An unprecedented intramolecular pyridine activation−asymmetric dearomatization reaction is described. This process produces 5-substituted indolizidines and 6-substituted quinolizidines in excellent yields and in a highly regio- and diastereoselective fashion. Formal syntheses of trans-indolizidine alkaloids are presented along with some preliminary results in the formation of C-5 quaternary centers
Enantioselective Synthesis of Indolizidine Alkaloid <i>trans</i>-209D
作者:Carlos Alegret、Antoni Riera
DOI:10.1021/jo801645p
日期:2008.11.7
(S)-N-Boc-baikiain, readily accessible from enantiomerically enriched 2,3-epoxy-5-hexen-1-ol 4 (prepared by Sharpless asymmetric epoxidation), was used as the starting material in the synthesis of indolizidinealkaloid trans-209D , which was obtained in 13 steps and 14% yield from 1 (5% from 4).