Water → HCID 13588075, compound

Participants

Reaction Steps

To 180 parts of tetrahydrofuran were added carefully 2.4 parts of lithium aluminium hydride under nitrogen atmosphere. Then there was added dropwise a solution of 7 parts of 4-[[1-(3-furanylcarbonyl)-1H-benzimidazol-2-yl]amino]-1-piperidineacetonitrile in tetrahydrofuran: temp. rose to 50° C. Upon completion, stirring was continued overnight at reflux temperature. The reaction mixture was cooled in an ice-bath and decomposed by the successive additions of 3 parts of water, 9 parts of a sodium hydroxide solution 15% and 9 parts of water. The whole was filtered over Hyflo and the filtrate was evaporated. The residue was purified by filtration over silica gel using a mixture of trichloromethane and methanol (80:20 by volume) saturated with ammonia, as eluent. The pure fractions were collected and the eluent was evaporated. The residue was crystallized from acetonitrile, yielding 3.6 parts (69.5%) of N-[1-(2-aminoethyl)-4-piperidinyl]-1H-benzimidazol-2-amine; mp. 99.8° C. (intermediate 129).

Provenance & Evidence