Enantioselective direct α-alkylation of cyclic ketones by means of photo-organocatalysis
作者:Elena Arceo、Ana Bahamonde、Giulia Bergonzini、Paolo Melchiorre
DOI:10.1039/c4sc00315b
日期:——
catalytic alkylation of unmodified ketones with alkyl halides. This metal-free approach, which requires light in order to proceed, provides a rare example of highly enantioselective photochemical catalytic processes. An easily available cinchona-based primary amine catalyst guides both the stereoselectivity-defining event and, through the transient formation of photon-absorbing chiral electron donor–acceptor
我们在这里报告未改性酮与烷基卤化物的第一个不对称催化烷基化反应。这种需要光才能进行的无金属方法提供了高度对映选择性光化学催化过程的罕见实例。一种易于获得的基于金鸡纳气的伯胺催化剂既可以指导定义立体选择性的事件,又可以通过光子吸收性手性电子供体-受体复合物的瞬时形成来引导底物的光活化。