Synthesis of Polysubstituted Pyrazolo[3,4-b]pyridine-3-Carbohydrazide and Pyrazolo[3,4-d]pyridazine Derivatives
摘要:
5‐Amino‐4‐formyl pyrazole carboxylate gave facile reactions with malononitrile, hydrazine, and ketones in the presence of piperidine furnished substituted pyrazolo[3,4‐b]pyridines and pyrazolo[3,4‐b]quinolones. The pyridazine sulfonamides were obtained by the reaction of 5‐chloro 4‐formyl pyrazole carboxylate with sulfonamide derivatives.