Asymmetric Synthesis of (−)-Swainsonine, (+)-1,2-Di-<i>epi</i>-swainsonine, and (+)-1,2,8-Tri-<i>epi</i>-swainsonine
作者:Karl B. Lindsay、Stephen G. Pyne
DOI:10.1021/jo025977w
日期:2002.11.1
The asymmetric synthesis of H-swainsonine via a nonchiral pool route that involves the Sharpless epoxidation to induce chirality is reported. The key steps involve vinyl epoxide aminolysis, ring-closing metathesis, and intramolecular N-alkylation to prepare the indolizidine ring and a highly diastereoselective cis-dihydroxylation using AD-mix-cc. This synthetic strategy also allowed for the diastereoselective synthesis of (+)-1,2-di-epi-swainsonine and (+)-1,2,8-tri-epi-swainsonine.