A convenient environmentally friendly method for the cyclization of 2-aminochalcones to 2-aryl-2,3-dihydroquinolin-4(1H)-ones on the surface of silica gel impregnated with indium(III) chloride under microwave irradiation without any solvent has been reported.
indium(III) chloride/silica gel - 2-aminochalcones - microwave - solvent-free conditions