Total Synthesis of (−)-Steganone Utilizing a Samarium(II) Iodide Promoted 8-Endo Ketyl−Olefin Cyclization
作者:Lauren G. Monovich、Yvan Le Huérou、Magnus Rönn、Gary A. Molander
DOI:10.1021/ja9930059
日期:2000.1.1
A six-step synthesis of (±)-steganone from commercially available 3,4,5-trimethoxybenzyl alcohol features a samarium(II) iodide promoted 8-endo ketyl−olefin coupling to install, in a single transformation, the 8,5 ring system common to the lignan lactones. The racemic synthesis provided the basis for the construction of (−)-steganone, which exploited a chromium tricarbonyl moiety both to establish
从市售的 3,4,5-三甲氧基苯甲醇分六步合成 (±)-steganone 的特点是碘化钐 (II) 促进了 8-endo ketyl-烯烃偶联,以在一次转化中安装 8,5 环木脂素内酯共有的系统。外消旋合成为构建 (-)-steganone 提供了基础,它利用铬三羰基部分通过关键转化来建立和保护所需的绝对立体化学,包括 SmI2 促进的 8-endo 自由基环化和两个钯催化联轴器。