Hydrochloric Acid → HCID 19086843, compound

Participants

Reaction Conditions

Reaction Steps

46 Grams of 6-(4,4-ethylenedioxy-1-piperidylcarbonyl)3,4-dihydrocarbostyril was dispersed in 400 ml of dioxane and 150 ml of water, then 15 ml of concentrated hydrochloric acid was added thereto and the whole mixture was heated at 100° C. for 7 hours with stirring. After the reaction mixture was allowed to stand for cooling, then was made alkaline by adding sodium carbonate, and the solvent was removed by evaporation. The residue thus obtained was extracted with chloroform, and the extract was dried with anhydrous sodium carbonate, and the solvent was removed by evaporation. The residue thus obtained was purlfied by means of a silica gel column chromatography (eluent:dichloromethane:methanol=10:1) to yield 37.6 g of 6-(4-oxo-1-piperidylcarbonyl)-3,4-dihydrocarbostyril.

Provenance & Evidence