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A rapid and efficient method for the synthesis of isoxazolo[5,4-d]pyrimidin-4(5H)-ones has been developed through cyclocondensation of 5-aminoisoxazole-4-carboxamides with orthoesters under conventional heating and solvent-free microwave irradiation with solid acid catalysis.In comparison,the reactions are faster and the yields are higher under microwave irradiation.
A rapid and efficient method for the synthesis of isoxazolo [5,4-d] pyrimidin-4 (5H) -ones has been developed through cyclocondensation of 5-aminoisoxazole-4-carboxamides with orthoesters under conventional heating and solvent-free microwave irradiation with solid acid catalysis.In comparison, the reactions are faster and the yield are higher under microwave irradiation.