ULTRASOUND PROMOTED Cu(ClO4)(2) CATALYZED RAPID SYNTHESIS OF SUBSTITUTED 1,2,3,4-TETRAHYDROPYRIMIDINE-2-ONES & HANTZSCH 1,4-DIHYDROPYRIDINES IN DRY MEDIA

Copper perchlorate supported on bentonite clay as catalyst at room temperature gives 6-methyl-4-substituted-phenyl-2-oxo(thioxo)-1,2,3,4-tetrahydropyrimidine-5-carboxylic acid ethyl esters & diethyl 2,6-dimethyl-4-substitutedphenyl-1,4dihydropyridine-3,5-dicarboxylate proficiently in high yields in solvent-less media under ultrasonic irradiation.