An Optimized Process for Formation of 2,4-Disubstituted Imidazoles from Condensation of Amidines and α-Haloketones
作者:Bryan Li、Charles K.-F. Chiu、Richard F. Hank、Jerry Murry、Joshua Roth、Harry Tobiassen
DOI:10.1021/op025552b
日期:2002.9.1
The preparation of 2,4-disubstituted imidazoles from the condensation of alpha-haloketones with amidines is described. The optimal reaction protocol is to add the alpha-bromoketone solution to the amidine in aqueous tetrahydrofuran in the presence of potassium bicarbonate under vigorous reflux. Imidazole was isolated in 83-91% yield with >95% purity without column chromatography.