Hydrochloric Acid → HCID 178515830, compound

Participants

Reaction Steps

A mixture of 3-[2-(2-cyanomethyl-1-cyclohexenyl)-3-oxo-2,3-dihydropyridazin-6-yl]-2-phenylpyrazolo[1,5-a]-pyridine (1 g), sodium azide (480 mg) and ammonium chloride (200 mg) in 1-methyl-2-pyrrolidone (10 ml) was heated at 140° to 150° C. for 6 hours with stirring. The reaction mixture was cooled to room temperature, which was poured into water and adjusted to pH 1.0 with 1N-aqueous hydrochloric acid. The resulting solution was extracted three times with ethyl acetate (100 ml). Organic layers were combined, washed with brine (50 ml×2) and dried over magnesium sulfate. Evaporation of the solvent gave a residue, which was chromatographed on silica gel eluting in turn with 2%, 3%, 5%, 10% methanol in dichloromethane. Fractions containing desired product were collected. Evaporation of the solvent gave a residue which was recrystallized from ethyl acetate to give 3-[2-{2-(1H-tetrazol-5-yl)methylenecyclohexyl}-3-oxo-2,3-dihydropyridazin-6-yl]-2-phenylpyrazolo[1,5-a]pyridine (85 mg).

Provenance & Evidence