Hydrazine hydrate (1:1) → 4-Aminomethyl-N-{2-[4-(4-fluorobenzoyl)piperidino]ethyl}-N-(2-methoxyphenyl)benzenesulfonamide

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N-{2-[4-(4-Fluorobenzoyl)piperidino]ethyl}-N-(2-methoxyphenyl)-4-phthalimidomethylbenzenesulfonamide (77 mg, 0.117 mmol) was dissolved in a methanol-THF (3:2) mixture solution (2.5 ml) to which was subsequently added hydrazine hydrate (1 ml) while cooling in an ice bath. After 15 minutes of stirring at the same temperature, the organic solvent was removed by evaporation, and the resulting residue was extracted with methylene chloride. The resulting organic layer was washed with saturated sodium bicarbonate aqueous solution and saturated brine, and dried on anhydrous sodium carbonate, followed by the removal of the solvent by evaporation. To the resulting residue was added an acetic acid-THF-water (3:1:1) mixture solution (3 ml). After 2 hours of stirring at room temperature, the solvent was removed by evaporation, and the resulting reaction solution was diluted with ethyl acetate (15 ml), mixed with saturated sodium bicarbonate aqueous solution (5 ml) and then extracted with ethyl acetate. After drying the extract on anhydrous sodium carbonate, the solvent was removed by evaporation, and the resulting light yellow oily residue was purified by a silica gel column chromatography (methylene chloride:methanol=20:1 to 9:1) to obtain 47 mg (76.4%) of the title compound in a colorless oily form.

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