Thionyl Chloride → 3-(4-t-Butylbenzyloxy)-N-(2-sulfamoylphenyl)benzamide

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A benzene (30 ml) solution containing 4.00 g (14.0 mmol) of 3-(4-t-butylbenzyloxy)benzoic acid and 3 ml of thionyl chloride was heated under reflux for 2 hours and then the solvent was evaporated under a reduced pressure. The resulting residue was dissolved in methylene chloride (30 ml), this solution was added dropwise under ice-cooling to a pyridine (50 ml) solution containing 2.42 g (14.0 mmol) of 2-aminobenzenesulfonamide, the mixture was stirred at room temperature for 18 hours and then methylene chloride was evaporated under a reduced pressure. The resulting residue was dissolved in ethyl acetate, washed with a 1 N hydrochloric acid aqueous solution, water and saturated brine in that order and dried over anhydrous sodium sulfate, and then the solvent was evaporated under a reduced pressure. The thus obtained crude crystals were recrystallized from an ether-hexane mixed solvent to obtain 4.2 g (yield: 68.0%) of the title compound.

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