Enantioselective route to a key intermediate in the total synthesis of ginkgolide B
作者:E.J. Corey、Ashvinikumar V. Gavai
DOI:10.1016/0040-4039(88)85121-9
日期:1988.1
An enantioselective route for the totalsynthesis of ginkgolide B, a potent antagonist of platelet activating factor, has been developed which is based on enantioselective reduction of enone 3 to the (R)-alcohol 5 and subsequent diastereoselective anti-SN2' displacement to form 7. Intermediate 7 was converted in several steps to tetracyclic lactone 2 which was obtained in optically pure form simply
已经开发了一种全合成银杏内酯B(一种有效的血小板活化因子拮抗剂)的对映选择性路线,该路线基于将烯酮3对映体选择性还原为(R)-醇5和随后的非对映选择性抗-S N 2'置换为。表格7。将中间体7分几步转化为四环内酯2,该四环内酯2仅通过重结晶就可以以光学纯的形式获得。