Abstract
Tri- and tetraalkylammonium, 1,3-dialkylimidazolium, and 1,2,3-trialkylimidazolium salts with BF 4 − , PF 6 − , AlCl 4 − , and Al2Cl 7 − as counterions catalyze the Biginelli reaction, ensuring preparation of various 3,4-dihydropyrimidin-2(1H)-one and 3,4-dihydropyrimidine-2(1H)-thione derivatives in high yields in the absence of a solvent.
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