Catalytic Asymmetric Crotylation of Aldehydes: Application in Total Synthesis of (−)-Elisabethadione
作者:Paul S. O'Hora、Celia A. Incerti-Pradillos、Mikhail A. Kabeshov、Sergei A. Shipilovskikh、Aleksandr E. Rubtsov、Mark R. J. Elsegood、Andrei V. Malkov
DOI:10.1002/chem.201500176
日期:2015.3.16
A new, highly efficient Lewis base catalyst for a practical enantio‐ and diastereoselective crotylation of unsaturated aldehydes with E‐ and Z‐crotyltrichlorosilanes has been developed. The method was employed as a key step in a novel asymmetric synthesis of bioactive serrulatane diterpene (−)‐elisabethadione. Other strategic reactions for setting up the stereogenic centers included anionic oxy‐Cope
已开发出一种新型的高效路易斯碱催化剂,用于将不饱和醛与E-和Z-巴豆基三氯硅烷进行实际的对映异构和非对映异构的丁烯化。该方法被用作新的生物活性六氟烷二萜(-)-伊丽莎白乙二酮的不对称合成中的关键步骤。建立立体生成中心的其他战略反应包括阴离子氧化-Cope重排和阳离子环化。合成途径依赖于简单,高产率的反应,并且避免使用保护基或手性助剂。