Synthesis of the Tetracyclic Core (ABCE Rings) of Daphenylline
作者:Bowen Fang、Huaiji Zheng、Changgui Zhao、Peng Jing、Huilin Li、Xingang Xie、Xuegong She
DOI:10.1021/jo301533f
日期:2012.9.21
A concise synthesis of the tetracyclic core (ABCE rings) of daphenylline has been accomplished involving a benzobicyclo[3.3.1] lactam as the key intermediate. This bridged bicyclic intermediate was efficiently constructed via a Brønstedacid promoted intramolecular Friedel–Crafts type Michaeladdition of a δ-benzyl α,β-unsaturated δ-lactam.