Sodium Hydroxide → HCID 66650561, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of ethyl 5-(4-chloro-phenyl)-pyrazolo[1,5-a]pyrimidine-3-carboxylate (0.12 g, 0.4 mmol) and 0.5 N sodium hydroxide solution (4 mL) in methanol (4 mL) was heated to 70° C. for 2 h. The mixture was cooled, diluted with water (8 mL) and concentrated in vacuo. The aqueous solution was acidified to pH 2 by the addition of 3N HCl. The precipitate was isolated by filtration, washed with water, and dried to give 5-(4-chloro-phenyl)-pyrazolo[1,5-a]pyrimidine-3-carboxylic acid (0.11 g, 100%). Off-white solid. MS (ISN) 272.3 [(M−H)−]; mp 309-311° C.

Provenance & Evidence