Organocatalytic Stereoselective α-Alkylation of Aldehydes with Stable Carbocations
作者:Fides Benfatti、Elena Benedetto、Pier Giorgio Cozzi
DOI:10.1002/asia.201000160
日期:2010.9.3
stereoselective alkylation of aldehydes is carried out with the four stable carbocations 1, 2, 3, 4 in the presence of a catalytic amount (20 mol%) of MacMillan imidazolidinones 5, 6. In all reactions, lutidine was used as a base. The alkylation reactions are investigated at different temperatures with linear and branched aldehydes. In the case of carbocation tropyliumfluoroborate, an interesting