Hydrochloric Acid → HCID 178498899, compound

Participants

Reaction Steps

A mixture of 2.30 g of methyl 5-chloro-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidine-3-carboxylate and 2.0 g of sodium hydrogen sulphide monohydrate in 60 ml of water was stirred at 60° for 1 hour. The reaction mixture was cooled, acidified with hydrochloric acid and extracted with ethyl acetate. The organic phase was washed with saturated sodium chloride solution, dried over sodium sulphate and concentrated in a vacuum until crystallization occurred. Petroleum ether was added and the solid product was filtered off under suction. There was obtained methyl 5-mercapto-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidine-3-carboxylate.

Provenance & Evidence