作者:Lei Shi、Xinsheng Lei、Jiange Zhang、Guoqiang Lin
DOI:10.1002/hlca.200900243
日期:2010.3
The first synthetic approach to (±)‐Δ3‐2‐hydroxybakuchiol (=4‐[(1E,5E)‐3‐ethenyl‐7‐hydroxy‐3,7‐dimethylocta‐1,5‐dien‐1‐yl]phenol; 14) and its analogues 13a–13f was developed by 12 steps (Schemes 2 and 3). The key features of the approach are the construction of the quaternary C‐center bearing the ethenyl group by a Johnson–Claisen rearrangement (→6); and of an (E)‐alkenyl iodide via a Takai–Utimoto
第一合成方案(±)-Δ 3 -2- hydroxybakuchiol(= 4 - 〔(1- ë,5 ë)-3-乙烯基-7-羟基-3,7-二甲基辛-1,5-二烯-1- yl] phenol; 14)及其类似物13a - 13f通过12个步骤开发(流程2和3)。该方法的关键特征是通过Johnson-Claisen重排(→ 6)构建带有乙烯基的季碳中心。和的(Ë -烯基碘化物)经由一个高井-Utimoto反应(→ 11); 和芳基化通过一个Negishi交叉偶联反应(→ 12e – 12f)。