Potassium Carbonate → 3-Phenyl-4-(4-chlorophenacyl)-2-piperazinone

Participants

Reaction Steps

A stirred mixture of 58.0 g (0.33 mol) of 3-phenyl-2-piperazinone, 85 g (0.62 mol) of blended potassium carbonate, and 76.9 g (0.33 mol) of 4-chlorophenacyl bromide in 400 ml of dichloromethane was heated at reflux for 12 hours. The mixture was cooled to ambient temperature, filtered, and the solid washed thoroughly with dichloromethane. The filtrate was concentrated to dryness, isopropanol added and stirred, the solid collected by filtration, washed thoroughly with isopropanol and dried in a vacuum oven at 50° C. to give 92.5 g (85 %) of 3-phenyl-4-(4-chlorophenacyl)-2-piperazinone. This material was used in Example 2 of the process. Pure material could be obtained by recrystallization from methanol to give a white solid (mp. 157°-158° C. dec.).

Provenance & Evidence