Beyond the Corey Reaction II: Dimethylenation of Sterically Congested Ketones
作者:Anastasiya V. Barabash、Ekaterina D. Butova、Igor M. Kanyuk、Peter R. Schreiner、Andrey A. Fokin
DOI:10.1021/jo502021x
日期:2014.11.7
methyl ketones show significantly decreased reactivities toward the Corey-Chaykovsky methylenation reagent dimethylsulfoxonium methylide (DMSM). The excess of base and temperature increase opens an alternative reaction channel that instead leads to the corresponding cyclopropylketones. Computations suggest that the initial reaction step involves the methylene group transfer from DMSM on the ketone enolate