[摘要]：A facile and efficient one-pot three-component synthesis of pyrazolo[1,2-a][1,2,4]triazole-1,3-diones via condensation reaction between malononitrile, 4-phenylurazole and aromatic aldehydes in ethanol under the catalytic effect of triethylamine and ultrasonic-irradiation conditions has been explored. The advantages of this protocol include a simple workup, high rates, use of inexpensive non-toxic catalyst, improved yields, and use of ethanol as a relatively environmentally benign solvent.
