The dialkylation and cycloalkylation reactions of active methylene compounds in the presence of readily available imidazolium salts (ionic liquids) as phase transfer catalysts were performed to afford the respective dialkylated or cycloalkylated products. This method is very efficient for the synthesis of 1,1-disubstituted derivatives and cyclopropane and cyclopentane ring systems in a facile manner
Trimethylsilylethynyl Ketones as Surrogates for Ethynyl Ketones in the Double Michael Reaction
作者:Derrick S. Holeman、Ravindra M. Rasne、Robert B. Grossman
DOI:10.1021/jo0163086
日期:2002.5.1
Trimethylsilylethynyl ketones can be desilylated in the presence of a tethered carbon diacid and induced to undergo a double Michaelreaction in situ. The trimethylsilylethynyl ketones can serve as surrogates of ethynyl ketones that are difficult to prepare or isolate.