Carbon Disulfide → 1-(4-fluorophenylmethyl)-N-[1-(2-isothiocyanatoethyl)-4-piperidinyl]1H-benzimidazol-2-amine

Participants

Reaction Steps

To a stirred and cooled (below 10° C.) mixture of 5.04 parts of carbon disulfide, 2.06 parts of N,N'-methanetetraylbis[cyclohexanamine]and 45 parts of tetrahydrofuran was added dropwise a solution of 3.7 parts of N-[1-(2-aminoethyl)-4-piperidinyl]-1-(4-fluorophenylmethyl)-1H-benzimidazol-2-amine in tetrahydrofuran. Upon completion, stirring was continued overnight while the mixture was allowed to reach room temperature. The reaction mixture gas evaporated. The residue was purified by column-chromatography over silica gel using a mixture of trichloromethane and methanol (98:2 by volume) as eluent. The pure fractions were collected and the eluent was evaporated, yielding 4 parts (100%) of 1-(4-fluorophenylmethyl)-N-[1-(2-isothiocyanatoethyl)-4-piperidinyl]1H-benzimidazol-2-amine as a residue (intermediate 141).

Provenance & Evidence