作者:John A. Enquist、Scott C. Virgil、Brian M. Stoltz
DOI:10.1002/chem.201100425
日期:2011.8.29
double asymmetric catalytic alkylation procedure it is possible to quickly establish two of the most critical stereocenters of the cyanthiwigin framework with high levels of selectivity and expediency. The synthetic route additionally employs both a tandem ring‐closing cross‐metathesis reaction, and an aldehyde‐olefin radical cyclization process, in order to rapidly arrive at the tricyclic cyathane
描述了一种用于制备氰基天然产物 cyanthiwigin 家族的简洁而通用的方法。通过利用独特的双不对称催化烷基化程序,可以快速建立具有高选择性和便利性的 cyanthiwigin 框架的两个最关键的立体中心。合成路线另外采用串联闭环交叉复分解反应和醛-烯烃自由基环化过程,以快速到达花青素分子的三环氰基核心。从这种统一的中间体,无需保护基团即可快速制备花青素 B、F 和 G。