Synthetic and Mechanistic Aspects on the Competition between C–H Insertion and Hydride Transfer in Copper-Mediated Transformations of α-Diazo-β-Keto Sulfones
作者:Anita Maguire、Catherine Slattery、Alan Ford、Kevin Eccles、Simon Lawrence
DOI:10.1055/s-0033-1340471
日期:——
Competition between C–H insertion and hydride transfer is reported for the copper-catalysed reactions of a range of phenyl-substituted α-diazo-β-keto sulfones. Control of chemoselectivity is possible by alteration of the electronic properties of the diazo substrate. The production of enantioenriched cyclopentanones (up to 89% ee), formed via C–H insertion, and alkylidene tetrahydrofurans (up to 43%
据报道,在一系列苯基取代的 α-重氮-β-酮砜的铜催化反应中,C-H 插入和氢化物转移之间存在竞争。通过改变重氮底物的电子特性可以控制化学选择性。描述了通过 C-H 插入形成的对映体富集的环戊酮(高达 89% ee)和通过氢化物转移产生的亚烷基四氢呋喃(高达 43% ee)的生产。氢化物转移衍生产物的分离提供了对铜介导的 α-重氮羰基化合物的 C-H 插入的机制洞察。