Abstract 1, 2-Diaryl-4-phenylmethylene-2-imidazolin-5-ones were obtained by the interaction of primary amines with 2-phenyl-4-phenylmethylene-2-oxazolin-5-one using acidic alumina or montmorillonite K10 clay under microwave irradiation (MWI). The same reaction over basic alumina gave arylamides of α-arylamido-β-arylacrylic acids in good yield. Usage of acidic alumina for cyclization gave better results in comparison with clay. ...