Microwave Assisted Synthesis of Pyridone Derivatives

A series of pyridone derivatives were synthesized by the reaction of aromatic aldehydes, 1,3‐dicarbonyl compounds and ammonium acetate under microwave irradiation in the absence of solvent. The reactions were completed within 3‐5 min to give the desired products in 72.4‐86.2% yields.     

Michael Addition Reaction without Catalyst：The Synthesis of 2—Amino—5,6,7,8—tetrahydro—5—oxo—4—aryl—7,7—dimethyl—4H—benzo—[b]—pyran Derivatives

A serices of tetrahydrobenzo-[b]-pyran derivative was synthesized by the reaction of arylmethylene malononitrile or arylmethylene cyanoacetate with dimedone in ethylene gylcol at 80℃ without catalyst. The structures of the two products were characterized by X-ray diffraction.