Preparation of a pharmaceutically active pyridazine derivative
申请人:I.S.F. Socièta per Azioni
公开号:EP0124058A1
公开(公告)日:1984-11-07
Preparation of ethyl6-[ethyl-(2-hydroxypropyl)amino]-3-pyridazinyl}hydrazino carboxylate is disclosed, from 3-chloro-6-hydrazinopyridazine in protected form, which is oxidized to yield the corresponding azo derivative, which is treated with ethyl-(2-hydroxypropyl)amine in the presence of strong bases, the corresponding amino derivative being subjected to reduction and deprotection, and finally acylated to yield ethyl6-[ethyl-(2-hydroxypropyl)amino]-3-pyridazinyl}hydrazinocarboxylate.
Hydrazinopyridazines, fused hydrazinopyridazines, phenylethylhydrazines, or combinations thereof, compositions comprising hydrazinopyridazines, fused hydrazinopyridazines, phenyl ethylhydrazines, or combinations thereof, and methods for using them for the treatment of pain are described.