Enantioselective Decarboxylative Cyanation Employing Cooperative Photoredox Catalysis and Copper Catalysis
作者:Dinghai Wang、Na Zhu、Pinhong Chen、Zhenyang Lin、Guosheng Liu
DOI:10.1021/jacs.7b09802
日期:2017.11.8
The merger of photoredoxcatalysis with asymmetric copper catalysis have been realized to convert achiral carboxylic acids into enantiomerically enriched alkyl nitriles. Under mild reaction conditions, the reaction exhibits broad substrate scope, high yields and high enantioselectivities. Furthermore, the reaction can be scaled up to synthesize key chiral intermediates to bioactive compounds.
reaction conditions for radical decarboxylation to produce alkyl radicals, which could be effectively intercepted by asymmetric electrochemical Cu catalysis for the construction of C−CN bonds in a highly stereoselective manner.
开发了一种可持续且高效的电光化学金属催化方案,用于将现成的脂肪族羧酸直接转化为手性烷基腈。电光化学 Ce 催化能够在温和的反应条件下自由基脱羧产生烷基自由基,其可以被不对称电化学 Cu 催化有效拦截,以高度立体选择性的方式构建 C-CN 键。
Catalytic Asymmetric Protonation of Silyl Ketene Imines
作者:Joyram Guin、Georgy Varseev、Benjamin List
DOI:10.1021/ja312141b
日期:2013.2.13
An efficient catalytic and highly enantioselective protonation of silyl ketene imines is described. The reaction is catalyzed by the chiral phosphoric acids TRIP or STRIP in the presence of a stoichiometric amount of methanol as the proton source and silyl acceptor. A variety of substituted racemic silyl ketene imines have been transformed into highly enantioenriched nitriles.