Enantioselective Rhodium-Catalyzed Allylic Alkylation of Prochiral α,α-Disubstituted Aldehyde Enolates for the Construction of Acyclic Quaternary Stereogenic Centers
作者:Timothy B. Wright、P. Andrew Evans
DOI:10.1021/jacs.6b10099
日期:2016.11.30
highly enantioselective rhodium-catalyzed allylic alkylation of prochiral α,α-disubstituted aldehyde enolates with allyl benzoate is described. This protocol provides a novel approach for the synthesis of acyclic quaternary carbon stereogenic centers and it represents the first example of the direct enantioselective alkylation of an aldehyde enolate per se. The versatility of the α-quaternary aldehyde
描述了前手性 α,α-二取代醛烯醇化物与苯甲酸烯丙酯的高度对映选择性铑催化烯丙基烷基化。该协议为合成无环季碳立体中心提供了一种新方法,它代表了醛烯醇本身直接对映选择性烷基化的第一个例子。α-季醛产品的多功能性通过将它们转化为各种适用于靶向合成的有用基序来证明。最后,机理研究表明,前手性 (E)- 和 (Z)- 烯醇化物的混合物可实现高水平的不对称诱导,这为此类转化提供了令人兴奋的发展。