Hydrochloric Acid → HCID 20436001, compound

Participants

Reaction Steps

1.1 g of methyl 2-(2-acetylthioethyl)-2,3,5,8-tetrahydro-2-methyl-1,3-dioxo-1H-pyrazolo[1,2-a]pyridazine-5-carboxylate (diastereomer A) were heated under reflux for 3 hours with 25 ml of 2 M hydrochloric acid. After evaporation, the residue was taken up in dichloromethane, the solution was dried over magnesium sulfate and then evaporated. There was obtained 0.35 g (38%) of 2,3,5,8-tetrahydro-2-(2-mercaptoethyl)-2-methyl-1,3-dioxo-1H-pyrazolo[1,2-a]pyridazine-5-carboxylic acid (diastereomer A) in the form of a white solid having a melting point of 113°-114° C. (from diethyl ether/petroleum ether).

Provenance & Evidence