Hydrazine hydrate (1:1) → HCID 118271762, compound

Participants

Reaction Conditions

Reaction Steps

Methyl 4,6-dichloro-5-fluoronicotinate (5.0 g, 22.32 mmol) and hydrazine monohydrate (1.7 mL, 22.32 mmol) were dissolved in ethanol (5 mL) and stirred at 80° C. for 1 h. The reaction mixture was filtered, dissolved in MeOH, and HCl (1 N, 0.5 mL) was added. The reaction was stirred at room temperature for 4 h. The reaction mixture was then filtered and washed with water to give 6-chloro-7-fluoro-1H-pyrazolo[4,3-c]pyridin-3(2H)-one, which was carried onto the next step without further purification. MS ESI calc'd. for C6H13ClFN3O [M+1]+ 188. found 188.

Provenance & Evidence