General Route to 4a-Methylhydrofluorene Diterpenoids: Total Syntheses of (±)-Taiwaniaquinones D and H, (±)-Taiwaniaquinol B, (±)-Dichroanal B, and (±)-Dichroanone
作者:Mainak Banerjee、Ranjan Mukhopadhyay、Basudeb Achari、Asish Kr. Banerjee
DOI:10.1021/jo052589w
日期:2006.3.31
A general and convergent route for the synthesis of the 4a-methylhydrofluorene diterpenoids has been established through a common hexahydrofluorenoneintermediate (10) obtained via Pd(0)-catalyzed reductive cyclization of a substituted 2-(2-bromobenzyl) methylene cyclohexane (13). The strategy has been successfully utilized for the synthesis of (±)-taiwaniaquinones D (3) and H (5), (±)-taiwaniaquinol