Asymmetric aerobic oxidative NHC-catalysed synthesis of dihydropyranones utilising a system of electron transfer mediators
作者:A. Axelsson、E. Hammarvid、L. Ta、H. Sundén
DOI:10.1039/c6cc06060a
日期:——
Enantioselective synthesis of dihydropyranones via aerobic multistep electron transfer NHC catalysis. Selective introduction of O2 as the terminal oxidant.
Polyhalides as Efficient and Mild Oxidants for Oxidative Carbene Organocatalysis by Radical Processes
作者:Xingxing Wu、Yuexia Zhang、Yuhuang Wang、Jie Ke、Martin Jeret、Rambabu N. Reddi、Song Yang、Bao-An Song、Yonggui Robin Chi
DOI:10.1002/anie.201611692
日期:2017.3.6
Simple and inexpensive polyhalides (CCl4 and C2Cl6) have been found to be effective and versatile oxidants in removing electrons from Breslow intermediates under N‐heterocyclic carbene (NHC) catalysis. This oxidative reaction involves multiple single‐electron‐transfer (SET) processes and several radical intermediates. The α, β, and γ‐carbon atoms of aldehydes and enals could be readily functionalized
Direct Activation of β-sp<sup>3</sup>-Carbons of Saturated Carboxylic Esters as Electrophilic Carbons via Oxidative Carbene Catalysis
作者:Bin Liu、Weihong Wang、Ruoyan Huang、Jiekuan Yan、Jichang Wu、Wei Xue、Song Yang、Zhichao Jin、Yonggui Robin Chi
DOI:10.1021/acs.orglett.7b03650
日期:2018.1.5
An N-heterocyclic carbene-catalyzed oxidative LUMO activation of the β-cabons of saturated carboxylic esters is disclosed. This approach allows for efficient asymmetric access to lactams and lactones by directly installing functional groups to the typically inert β-sp3 carbons of saturated esters. The use of HOBt as an additive was found to significantly improve both yields and enantioselectivities