Pyridine → N-[5-Chloro-4-[(4-chlorophenylsulfonyl)(2,5-difluorophenyl)methyl]pyridin-2-yl]methanesulfonamide

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Reaction Steps

To a pyridine (2 ml) solution of the [5-chloro-4-[(4-chlorophenylsulfonyl)(2,5-difluorophenyl)methyl]pyridin-2-yl]amine (106 mg, 0.247 mmol) obtained in Example 196 was added methanesulfonyl chloride (29 μl, 0.370 mmol) under ice cooling. The resulting mixture was stirred at room temperature for 3 days and concentrated under reduced pressure. To the residue thus obtained was added ethyl acetate. The resulting mixture was washed sequentially with a saturated aqueous solution of sodium bicarbonate, water and brine, dried over anhydrous sodium sulfate, and filtered. The filtrate was concentrated under reduced pressure. The residue thus obtained was subjected to flash silica gel column chromatography. The fraction obtained from the hexane:ethyl acetate=3:1 eluate was concentrated under reduced pressure to give the title compound (58 mg, 0.114 mmol, 46%) as a white solid. The resulting white solid was washed with hexane-ether and collected by filtration to give the title compound (28 mg) as a white powder.

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