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.
Reactivity of α-trifluoromethanesulfonyl esters, amides and ketones: Decarboxylative allylation, methylation, and enol formation
作者:Han Il Kong、Monica A. Gill、Amy H. Hrdina、Jennifer E. Crichton、Jeffrey M. Manthorpe
DOI:10.1016/j.jfluchem.2013.03.020
日期:2013.9
α-Trifluoromethylsulfonyl esters, ketones, and amides were all methylated in the presence of trimethylsilyldiazomethane. Esters afforded a mixture of O- and C-methylation; however, ketones and amides offered exclusively O-methylation, with varying degrees of E/Z selectivity, thus affording ambiphilic alkenes. α-Trifluoromethanesulfonyl ketones also exhibited keto-enol tautomerism.