A mild and efficient method was applied for the one-pot three-component synthesis of pyrazolo[1,2-a][1,2,4]triazole-1,3-diones from the condensation between arylaldehydes, malononitrile and 4-phenylurazole using electrolysis in an undivided cell in the presence of sodium bromide as an electrolyte. This procedure has many advantages such as : no need to catalyst, clean work-up, short reaction time and high yield. The products were obtained just with the simple filtration.
Ultrasonic-Assisted One-Pot Synthesis of Pyrazolo[1,2-a][1,2,4]triazole-1,3-diones
作者:Davood Azarifar、Razieh Nejat Yami
DOI:10.3987/com-10-11959
日期:——
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