An efficient totalsynthesis of rhodexin A (1) is reported. An initial inverse-electron-demand Diels–Alder reaction of the acyldiene 6 with the silyl enol ether 7 gave the cycloadduct 8 with the required 4 contiguous stereocenters in a single step. This compound was then transformed into the tetracyclic enone 16, which was converted to rhodexin A (1).
Preparation of a Functionalized Tetracyclic Intermediate for the Synthesis of Rhodexin A
作者:Michael E. Jung、Hiufung V. Chu
DOI:10.1021/ol801426z
日期:2008.8.21
An efficient synthesis of the tetracyclic steroid core, 19, of rhodexin A and sarmentogenin is reported. An initial inverse-electron-demand Diels-Alder reaction of the acyldiene 6 with the silyl enol ether 7a gave the cycloadduct 8 with the required four contiguous stereocenters in a single step. This compound was then transformed into the methylated enedione 13 which afforded after a reductive alkylation