Potassium Iodide → 1-{4-[4-(4-chlorophenyl)-4-hydroxy-1-piperidinyl]butyl}-1,3-dihydro-2H-benzimidazol-2-one

Participants

Reaction Steps

A mixture of 4.94 parts of 1-(4-chlorobutyl)-1,3-dihydro-2H-benzimidazol-2-one, 4.23 parts of 4-(4-chlorophenyl)-4-piperidinol, 5.3 parts of sodium carbonate, 0.1 parts of potassium iodide and 200 parts of 4-methyl-2-pentanone is stirred and refluxed for 20 hours with water-separator. The reaction mixture is cooled, water is added and the layers are separated. The organic phase is dried, filtered and evaporated. The residue is crystallized from 4-methyl-2-pentanone. The product is filtered off and dried, yielding 4 parts of 1-{4-[4-(4-chlorophenyl)-4-hydroxy-1-piperidinyl]butyl}-1,3-dihydro-2H-benzimidazol-2-one; mp. 160.6° C.

Provenance & Evidence