Facile Biginelli-Type Reactions Catalysed by Super Acidic Ionic Liquid under Solvent-Free Conditions
作者:Liang Wang、Min Zhou、Qun Chen、Ming-Yang He
DOI:10.3184/174751912x13518654161237
日期:2012.12
[MeC(OH)2]+ClO4- as a super acidicionicliquid is an extremely active catalyst for Biginelli-type reactions. The present method is especially effective for the inactive aliphatic aldehydes. The solvent-freeconditions, high catalytic activity, wide substrates tolerance and convenient product isolation make the protocol more advantageous.
One-Pot Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones Catalyzed by Acidic Ionic Liquids Under Solvent-Free Conditions
作者:Jianzhou Gui、Dan Liu、Chan Wang、Feng Lu、Jingzhao Lian、Heng Jiang、Zhaolin Sun
DOI:10.1080/00397910902774042
日期:2009.9.8
Abstract The acidic ionic liquids were new catalysts for the one-pot Biginelli reaction coupling of aldehyde, 1,3-dicarbonyl compound, and urea to afford the corresponding dihydropyrimidinones in good yields under solvent-freeconditions. The catalysts could be recycled and reused five times without a noticeable decrease in catalytic activity.
Studies on the Biginelli reaction: a mild and selective route to 3,4-dihydropyrimidin-2(1H)-ones via enamine intermediates
作者:John Mabry、Bruce Ganem
DOI:10.1016/j.tetlet.2005.10.124
日期:2006.1
l-Proline methyl ester hydrochloride was found to be an effective catalyst for assembling (±)-dihydropyrimidinones under mild conditions. Mechanistic insights into the useful selectivity elements of this amine-catalyzed process are also reported.