Methyl Isobutyl Ketone → 1-{3-[4-(diphenylmethoxy)-1-piperidinyl]propyl}-1,3-dihydro-2H-benzimidazol-2-one

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Reaction Steps

A mixture of 4.8 parts of 1-(3-chloropropyl)-1,3-dihydro-2H-benzimidazol-2-one, 6.1 parts of 4-(diphenylmethoxy)piperidine hydrochloride, 7.5 parts of sodium carbonate and 200 parts of 4-methyl-2-pentanone is stirred and refluxed overnight with water-separator. The reaction mixture is cooled and water is added. The layers are separated and the 4-methyl-2-pentanone-phase is 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. The residue is crystallized from 4-methyl-2-pentanone, yielding 1-{3-[4-(diphenylmethoxy)-1-piperidinyl]-propyl}-1,3-dihydro-2H-benzimidazol-2-one; mp. 149.2° C.

Provenance & Evidence