Rhodium-Catalyzed Allylic Substitution with an Acyl Anion Equivalent: Stereospecific Construction of Acyclic Quaternary Carbon Stereogenic Centers
作者:P. Andrew Evans、Samuel Oliver、Jungha Chae
DOI:10.1021/ja306602g
日期:2012.11.28
A highly regio- and stereospecific rhodium-catalyzed allylic alkylation of tertiary allylic alcohol derivatives with a cyanohydrin pronucleophile is described. This direct and operationally simple protocol provides a fundamentally novel approach toward the synthesis of α-quaternary substituted ketones and circumvents many of the inherent problems associated with conventional enolate alkylation reactions
描述了高度区域和立体定向铑催化的叔烯丙醇衍生物与氰醇原亲核试剂的烯丙基烷基化。这种直接且操作简单的方案为合成 α-季取代酮提供了一种全新的方法,并避免了与传统烯醇烷基化反应相关的许多固有问题。该反应的立体特异性变体提供了对映体富集的 α-季铵取代烯丙基芳基酮,对于更传统的基于烯醇化物的策略来说,这是一种特别具有挑战性的中间体。