Cobalt Catalyzed Functionalization of Unactivated Alkenes: Regioselective Reductive C−C Bond Forming Reactions
作者:Boris Gaspar、Erick M. Carreira
DOI:10.1021/ja904856k
日期:2009.9.23
The cobalt catalyzed hydroaldoximation and hydrocyanooximation of unactivatedalkenes is reported. Secondary and tertiary aldoximes and oximonitriles are synthesized with excellent regioselectivity under mild conditions, and conversion of the products to valuable intermediates is documented. The reactions expand the arsenal of reductive carbon-carbon bond forming reactions as well as regioselective
reaction of the PhSO2 radical with the allylsilane precursor. Better results were generally obtained with methallylsilane 1 b than with 1 a. This observation was rationalized by invoking the higher nucleophilicity of 1 b and the faster β‐fragmentation of the corresponding β‐silylradical intermediate. Calculation of the energy barrier for the β‐fragmentation of a series of β‐silylradicals at the DFT level