Total Syntheses of (+)-Australine and (−)-7-Epialexine
作者:William H. Pearson、Jennifer V. Hines
DOI:10.1021/jo000689q
日期:2000.9.1
naturally occurring 3-(hydroxymethyl)pyrrolizidines. A third approach to these compounds was successful. The transformation of L-xylose into the azido epoxy tosylate 46 was accomplished using two Wittigreactions and an epoxidation, in addition to other standard functional group manipulations. Reductive double-cyclization of 46 afforded the pyrrolizidines 47a and 47b, which were debenzylated to afford