Abstract
A new series of 3-substituted-9-(1,1′-biphenyl-4-yl)-7-phenyl-7H-pyrazolo[4,3-e][1,2,4]triazolo [4,3-c]pyrimidines and 2-substituted-9-(1,1′-biphenyl-4-yl)-7-phenyl-7H-pyrazolo[4,3-e][1,2,4] triazolo[1,5-c]pyrimidines were synthesised, as a new class of potent xanthine oxidase inhibitors, by oxidative cyclisation of 4-[2-(arylidene)hydrazinyl]-3-(1,1-biphenyl-4-yl)-1-phenyl-1H-pyrazolo[3,4-d]pyrimidines with FeCl3 in ethanol and Dimroth rearrangement.
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