A General Approach to 4-unsubstituted and 4-alkyl-substituted 5-acyl-1,2,3,4-tetrahydropyrimidine-2-thiones(ones) via α-(thio)ureidoalkylation of 1,3-diketones or β-oxoesters
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.
Trimethylsilyl Chloride: A Facile and Efficient Reagent for One‐Pot Synthesis of 3,4‐Dihydropyrimidin‐2(1<i>H</i>)‐ones
作者:Yulin Zhu、Yuanjiang Pan、Shenlin Huang
DOI:10.1081/scc-200028607
日期:2004.1
Trimethylsilyl chloride (TMSCl) was used as a Lewis acid to efficiently perform one-pot, three-components, Biginelli condensation reactions of aldehydes, 1,3-dicarbonyl compounds, and urea or thiourea. This resulted in simple one-pot synthesis of the corresponding 3,4-dihydropyrimidin-2(1H)-ones at room temperature with excellent yield.