过渡金属介导的 CC 键活化/裂解方法的持续发展将为实施新的合成策略提供更多机会。我们已经探索了存在于蒎烯羟基化衍生物中的环丁醇的 Rh(I) 催化 CC 活化,这与我们用许多传统亲电试剂观察到的 CC 键断裂互补。机理和计算研究提供了对 CH 键活化在 Rh 催化的 CC 键活化过程的立体化学结果中的作用的见解。使用这种新方法,已经获得了形成天然产物核心的功能化环己烯酮,包括螺菌胺和 phomactin A。
Rearrangement of Hydroxylated Pinene Derivatives to Fenchone-Type Frameworks: Computational Evidence for Dynamically-Controlled Selectivity
作者:Marcus Blümel、Shota Nagasawa、Katherine Blackford、Stephanie R. Hare、Dean J. Tantillo、Richmond Sarpong
DOI:10.1021/jacs.8b05804
日期:2018.7.25
An acid-catalyzed Prins/semipinacolrearrangementcascade reaction of hydroxylated pinene derivatives that leads to tricyclic fenchone-type scaffolds in very high yields and diastereoselectivity has been developed. Quantum chemical analysis of the selectivity-determining step provides support for the existence of an extremely flat potential energy surface around the transition state structure. This
An approach to construct enantiopure complex natural product-like frameworks, including the first reported synthesis of a C17 oxygenated taxoid scaffold, is presented. A palladium-catalyzed C–C activation/cross-coupling is utilized to access these structures in a short sequence from (+)-carvone; the scope of this reaction is explored.