Methyl Isobutyl Ketone → 1-(3-(4-(Diphenylmethyl)-1-piperazinyl)propyl)-1,3-dihydro-3-(1-methylvinyl)-2H-benzimidazol-2-one

Participants

Reaction Steps

A mixture of 42.6 parts of 1-(3-chloropropyl)-1,3-dihydro-3-(1-methylethenyl)-2H-benzimidazol-2-one, 38 parts of 1-(diphenylmethyl)piperazine, 48 parts of sodium carbonate and 400 parts of 4-methyl-2-pentanone is stirred and refluxed overnight with water-separator. The reaction mixture is cooled, water is cooled and the layers are separated. The 4-methyl-2-pentanone-phase is washed with water, dried, filtered and evaporated. The oily residue is purified by column-chromatography over silica gel using a mixture of trichloromethane and 5% of methanol as eluent. The pure fractions are collected and the eluent is evaporated, yielding 1-{3-[4-(diphenylmethyl)-1-piperazinyl]propyl}-1,3-dihydro-3-(1-methylethenyl)-2H-benzimidazol-2-one as a residue.

Provenance & Evidence