Potassium Hydroxide → 1-Benzenesulfonylamino-2-iodo-4-methanesulfonylbenzene

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To a suspension of the compound obtained in Example 8 (4) (4.90 g) in 1,4-dioxane (85 ml), a 1N aqueous potassium hydroxide solution (21.2 ml) was added and the mixture was stirred at 100° C. for 1 hour. After completion of the reaction, the reaction solution was concentrated under reduced pressure, poured into a saturated aqueous NaCl solution, extracted with tetrahydrofuran, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The resulting residue was separated using silica gel column chromatography (chloroform methanol=10:1) to obtain 3.47 g of the desired product in a colorless amorphous form.

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