Abstract
Reaction of 5-amino-1-phenyl-1H-pyrazolo-4-carboxamide 1 with aromatic aldehyde in presence of heteropoly acids, H 3PW 12O 40 and H 14[NaP 5W 30MoO 110] gave derivatives of 6-aryl-1H-pyrazolo[3,4-d]pyrimidin-4[5H]-ones 4.
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