Concise and divergent total synthesis of swainsonine, 7-alkyl swainsonines, and 2,8a-diepilentiginosine via a chiral heterocyclic enaminoester intermediate
作者:Gao-Feng Shi、Jia-Qi Li、Xiao-Ping Jiang、Ying Cheng
DOI:10.1016/j.tet.2008.03.080
日期:2008.5
The concise and divergent total syntheses of (−)-swainsonine, (−)-7-alkyl swainsonines, and (−)-2,8a-diepilentiginosine from a common chiral heterocyclic enaminoester intermediate in five-step sequences are presented. The highly efficient annulation reaction of the chiral heterocyclic enaminoester with various α,β-unsaturated carboxylates, and a straightforward carboxy inversion constituted the key
从五个步骤序列中,从一个常见的手性杂环烯胺酯中间体中得出了(-)-swainsonine,(-)-7-烷基swainsonines和(-)-2,8a-dipilentiginosine的简明和不同的总合成物。手性杂环烯胺酸酯与各种α,β-不饱和羧酸酯的高效环合反应以及直接的羧基转化是合成途径的关键特征。这项工作为从容易获得的平台不同合成不同的天然和非天然多羟基吲哚并吡啶类化合物提供了一个实例。