Stereoselective synthesis of ambiphilic alkenes via regioselective methylation of α-trifluoromethanesulfonyl carbonyl compounds with trimethylsilyldiazomethane
作者:Han Il Kong、Jennifer E. Crichton、Jeffrey M. Manthorpe
DOI:10.1016/j.tetlet.2011.05.015
日期:2011.7
alpha-Trifluoromethanesulfonyl esters, ketones and amides are C-H acids capable of reacting with trimethylsilyldiazomethane to afford the corresponding ambiphilic alkenes. While esters were found to be non-selective, ketones were highly regioselective for O-methylation and displayed variable E/Z stereoselectivity. Amides were observed to be both highly regio- and stereoselective, affording O-methylation with exclusive formation of the Z-alkene. (C) 2011 Elsevier Ltd. All rights reserved.