Nickel-Catalyzed Ipso-Borylation of Silyloxyarenes via C–O Bond Activation
作者:Wesley L. Pein、Eric M. Wiensch、John Montgomery
DOI:10.1021/acs.orglett.1c01280
日期:2021.6.18
The conversion of silyloxyarenes to boronic acid pinacol esters via nickel catalysis is described. In contrast to other borylation protocols of inert C–O bonds, the method is competent in activating the carbon–oxygen bond of silyloxyarenes in isolated aromatic systems lacking a directing group. The catalytic functionalization of benzyl silyl ethers was also achieved under these conditions. Sequential
A Dual Lewis Base Activation Strategy for Enantioselective Carbene-Catalyzed Annulations
作者:Javier Izquierdo、Ane Orue、Karl A. Scheidt
DOI:10.1021/ja405833m
日期:2013.7.24
activation strategy integrating N-heterocycliccarbene (NHC) catalysis and a second Lewis base has been developed. NHC-bound homoenolate equivalents derived from α,β-unsaturated aldehydes combine with transient reactive o-quinone methides in an enantioselective formal [4 + 3] fashion to access 2-benzoxopinones. The overall approach provides a general blueprint for the integration of carbenecatalysis with