作者:Ayumi Takizawa、Kenshu Fujiwara、Eriko Doi、Akio Murai、Hidetoshi Kawai、Takanori Suzuki
DOI:10.1016/j.tet.2006.05.014
日期:2006.7
Convergent synthesis of the common FGHI-ring part (54) of ciguatoxins was achieved via the following key steps: (i) the Nozaki–Hiyama–Kishi reaction connecting the F-ring part (6) with the I-ring part (7); (ii) regio- and stereoselective epoxidation; (iii) the 6-exo-epoxide opening reaction forming simultaneously the H-ring and the quaternary asymmetric center at C30; (iv) inversion of the C29 stereocenter
通过以下关键步骤实现了普通的瓜瓜毒素FGHI环部分(54)的收敛合成:(i)连接F环部分(6)和I环部分(7)的Nozaki–Hiyama–Kishi反应。; (ii)区域和立体选择性环氧化;(iii)在C30处同时形成H环和季不对称中心的6- exo- epoxy开环反应;(iv)通过两步氧化/还原过程使C29立构中心反转,其中成功的反转取决于对底物空间环境的适当管理;(v)最后的还原环化反应构建了G环。