Bronsted Acidic Ionic Liquids Catalyzed Three-Component Synthesis of 4,6-diarylpyrimidin-2(1H)-ones Under Solvent-Free Conditions

4,6-Diarylpyrimidin-2(1H)-one derivatives have been synthesized from three-component reaction of aromatic aldehyde derivatives, acetophenone, and urea (thiourea) in the presence of Bronsted acidic ionic liquids such as triethylammonium hydrogensulfate, N-methyl-2-pyrrolidonium dihydrogen phosphate, 3-methyl-1-sulfonic acid imidazolium chloride, N-methyl-2-pyrrolidonium hydrogensulfate, and 2-pyrrolidonium hydrogensulfate as catalyst under thermal solvent-free conditions in excellent yields. This new methodology presents five reusable ionic liquids as catalyst and their application in synthetic organic chemistry. (author)