1,3-Dibromopropane → HCID 14364333, compound

Participants

Reaction Steps

1-[3-(4-Benzyl-1-piperazinyl)propyl]-5-methyl-2-pyrrolidinone A solution of 5-methyl-2-pyrrolidinone (0.99 g/10.0 mmol) in tetrahydrofuran (10 ml) was added to a suspension of sodium hydride(60% in oil, 0.6 g/1 5.0 mmol) in tetrahydrofuran (50 ml) at 0° C. and the resulting mixture was stirred for 1 hour at ambient temperature. To the mixture was added a solution of 1,3-dibromopropane (5.1 ml/50.0 mmol) in tetrahydrofuran (10 ml) and the mixture was stirred for 1 day. The mixture was poured into water (50 ml) and extracted with ethyl acetate (50 ml×2). The combined extracts were washed with brine (50 ml), dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by column chromatography (Si, 230-400 mesh/dichloromethane:methanol=30:1) to give as a mixture of 1-(3-bromoproyl)-5-methyl-2-pyrrolidinone and 1-allyl-5-methyl-2-pyrrolidinone (0.8 g). The mixture was dissolved with ethanol (5 ml). To the solution was added 1-benzylpiperazine (0.4 mV/2.19 mmol), and the mixture was stand for 7 days. The solvent was removed in vacuo. The residue was dissolved in dichloromethane (20 ml) and 2N-NaOH (20 ml). The aqueous layer was extracted with dichloromethane (20 ml). The combined extracts were washed with brine (20 ml), dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified by column chromatography (Si, 230-400 mesh/dichloromethane:methanol=30:1-15:1) to give as the titled compound (0.59 g/19%).

Provenance & Evidence