p-Toluenesulfonic acid → 5-chloro-2-cyclohexyl-1H-benzimidazole-1-propanol

Participants

Reaction Steps

To a stirred and refluxing (water-separator) mixture of 30 parts of 3-[(2-amino-4-chlorophenyl)amino]-1-propanol and 0.1 parts of 4-methylbenzenesulfonic acid in 405 parts of methylbenzene is added dropwise a solution of 34 parts of cyclohexanecarboxaldehyde in 45 parts of methylbenzene. Upon completion, stirring is continued for one hour at reflux temperature and with water-separator. The methylbenzene is removed by evaporation in vacuo and the residue is triturated in 2,2'-oxybispropane. The product is filtered off and dried, yielding 5-chloro-2-cyclohexyl-1H-benzimidazole-1-propanol; mp. 95° C.

Provenance & Evidence