Enantioselective Double Michael Addition/Cyclization with an Oxygen-Centered Nucleophile as the First Step in a Concise Synthesis of Natural (+)-Asteriscanolide
作者:Leo A. Paquette、Jinsung Tae、Mark P. Arrington、Aladin H. Sadoun
DOI:10.1021/ja994053w
日期:2000.3.1
The total synthesis of (+)-asteriscanolide (1) starting from 2-bromo-4,4-dimethylcyclopentenone has been accomplished. The synthetic route features two key steps. The first step is an unprecedented Michael−Michael reaction sequence that involves a heteronucleophile and proceeds with complete asymmetric induction. The two five-membered rings of the target molecule are thereby generated enantioselectively
已经完成了以 2-溴-4,4-二甲基环戊烯酮为原料的 (+)-asteriscanolide (1) 的全合成。合成路线有两个关键步骤。第一步是史无前例的迈克尔-迈克尔反应序列,它涉及亲核试剂并进行完全不对称诱导。从而在单个实验室步骤中以对映选择性生成目标分子的两个五元环。第二步是基于利用闭环复分解来提供八元环,其中存在共轭 1,3-二烯单元。合成策略的其他特征包括在区域控制的烯反应中利用单线态氧、二烯酮的完全立体控制的氢化和化学选择性的四氧化钌氧化。