[F-].C([N+](CCCC)(CCCC)CCCC)CCC.[C:19]1([S:25]([N:28](S(C2C=CC=CC=2)(=O)=O)[C:29]2[CH:34]=[CH:33][C:32]([Br:35])=[CH:31][C:30]=2[I:36])(=[O:27])=[O:26])[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1>C1COCC1.C(OCC)(=O)C.Cl>[Br:35][C:32]1[CH:33]=[CH:34][C:29]([NH:28][S:25]([C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)(=[O:27])=[O:26])=[C:30]([I:36])[CH:31]=1
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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