Synthesis of Racemic Δ<sup>3</sup>-2-Hydroxybakuchiol and Its Analogues
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