1-benzyl-4-isothiocyanatopiperidine

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 28.4 parts of 4-isothiocyanato-1-(phenylmethyl)piperidine in 315 parts of methylbenzene are added dropwise 41 parts of (phenylmethyl) carbonochloridate at room temperature. Upon completion, the whole is heated to reflux and stirring is continued overnight at reflux temperature. The reaction mixture is cooled and the solvent is evaporated. The residue is purified by column-chromatography over silica gel using trichloromethane as eluent. The pure fractions are collected and the eluent is evaporated, yielding 32 parts (97%) of (phenylmethyl) 4-isothiocyanato-1-piperidinecarboxylate as a residue. Upon completion, the whole is heated to reflux at reflux temperature The reaction mixture is cooled the solvent is evaporated The residue is purified by column-chromatography over silica gel The pure fractions are collected the eluent is evaporated