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■ New Pyrazolo[3,4-b]pyridine and Pyrazolo[3,4-d]pyrimidine Derivatives from 4-Acetyl-5-amino-1,3-diphenylpyrazole

Vittorio Dal Piaz,* Giovanna Ciciani, and Stefano Chimichi

*Dipartimento di Scienze Farmaceutiche, Università di Firenze, Via Gino Capponi 9, I-50121 Firenze, Italy

Abstract

4-Acetyl-5-amino-1,3-diphenylpyrazole (1) undergoes cyclization with compounds of the type R-CH₂X ( X=COCH₃ and/or COPh, R=H and CH₃CO; X=R=CN) and with formamide to give new pyrazolo[3,4-b]pyridine and pyrazolo[3,4-d]pyrimidine derivatives, respectively.