Tetrabutylammonium Fluoride → N-(4-Bromo-2-iodophenyl)benzenesulfonamide

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A solution of tetrabutylammonium fluoride (1 M in THF, 11 mL) in 30 mL of THF was treated with N,N-bisbenzenesulfonyl-(4-bromo-2-iodoaniline) (5.78 g, 10 mmol) in several portions. After 18 hours, the mixture was diluted with of 40 mL of ethyl acetate and 40 mL of 1 N HCl. The phases were separated and the aqueous layer was extracted with two 40 mL portions of ethyl acetate. The combined organic layers were washed with two 20 mL portions of 1 N HCl, two 20 mL portions of saturated aqueous sodium bicarbonate solution, 20 mL of brine, dried over magnesium sulfate, filtered, and concentrated in vacuo to afford 3.95 g (90% yield) of the title compound as a solid, which was used without further purification.

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