Hydrazine hydrate (1:1) → 5-phenyl-1H-pyrazolo[3,4-c]pyridazin-3-amine

Participants

Reaction Steps

Hydrazine hydrate (0.7 ml, 14.3 mmol) was added to a stirred solution of 3-chloro-6-phenyl-pyridazine-4-carbonitrile (cf J. Med. Chem., 1999, 42, 730; 1.024 g, 4.7 mmol) in pyridine (10 ml). The reaction mixture was stirred at reflux for 6 hours, cooled and the resulting solid was filtered and dried in vacuo, affording the title compound as a solid.

Provenance & Evidence