Clay Catalysis: Dry Condensation of Tetronic Acid with Aldehydes under Microwave Irradiation. Synthesis of 3-(Arylmethylene)-2,4-(3H, 5H) Furandiones

Abstract

2,4(3H, 5H) Furandione (1) and arylcarboxyaldehydes(2) were condensated to 3-(arylmethylene)-2,4-(3H, 5H) furandione (3) in presence of acidic clay KSF without solvent under microwave irradiation, or in ethanol at room temperature for sensitive and reactive aldehydes (2c, 2g, 2h).