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.
Stereoselective Syntheses of Four Diastereomers of 3,9,12-Trihydroxycalamenene via a Benzobicyclo[3.3.1] Intermediate
作者:Yongquan Sun、Binxun Yu、Xiaolei Wang、Shibing Tang、Xuegong She、Xinfu Pan
DOI:10.1021/jo1008349
日期:2010.6.18
The highly stereoselectivesyntheses of four diastereomers of natural 3,9,12-trihydroxycalamenene are described. The syntheses highlight the utility of an unusual framework of benzobicyclo[3.3.1] lactones, which were accomplished via an intramolecular Friedel−Crafts-type Michael addition of α,β-unsaturated lactones.
A simple and practical approach has been developed for conducting direct, homoallylic alcohol forming allylation reactions of nitroalkenes in water. Employing the new method, various arylmethyl-homoallylic alcohols can be produced from the corresponding, readily prepared beta-nitrostyrenes.