An improved synthesis of Biginelli-type compounds via phase-transfer catalysis
作者:Bahar Ahmed、Riaz A. Khan、Habibullah、Manoj Keshari
DOI:10.1016/j.tetlet.2009.03.177
日期:2009.6
3,4-Dihydropyrimidin-2(1H)-one, 3,4-dihydropyrimidin-2(1H)-thione, and 3,4-dihydropyrimidin-2(1H)-imine derivatives were synthesized by modified Biginelli cyclocondensation reaction in a time-efficient manner with near quantitative yields starting from appropriately substituted aromatic aldehyde, β-ketoester and either urea, thiourea or guanidine as constituent synthons using tetra-butyl ammonium bromide