Hydrochloric Acid → 3,4-Dihydro-5-[2-hydroxy-3-(4-(ethoxycarbonylamino)-1-piperidyl)propoxy]carbostyril hydrochloride

Participants

Reaction Steps

Ethyl 4-piperidylcarbamate (2 g), from Preparation 4, and 5-(2,3-epoxypropoxy)-3,4-dihydrocarbostyril (2.54 g), from Preparation 5, were dissolved in ethanol (50 mL) and the resulting solution was heated under reflux for 6 hours and then cooled to room temperature. Concentrated hydrochloric acid (1 mL) was added. A white product precipitated, which was collected by filtration. The crude product was recrystallized from ethanol to yield 2.8 g (56.5%) of 3,4-dihydro-5-[2-hydroxy-3-(4-(ethoxycarbonylamino)-1-piperidyl)propoxy]carbostyril hydrochloride, m.p. 232°-234° C. (dec.).

Provenance & Evidence