Cl[CH2:2][CH2:3][CH2:4][S:5]([NH:8][C:9]1[CH:14]=[CH:13][C:12]([F:15])=[C:11]([F:16])[C:10]=1[NH:17][C:18]1[CH:23]=[CH:22][C:21]([I:24])=[CH:20][C:19]=1[F:25])(=[O:7])=[O:6].[OH-:26].[K+]>O1CCOCC1.O>[F:16][C:11]1[C:10]([NH:17][C:18]2[CH:23]=[CH:22][C:21]([I:24])=[CH:20][C:19]=2[F:25])=[C:9]([NH:8][S:5]([CH2:4][CH2:3][CH2:2][OH:26])(=[O:7])=[O:6])[CH:14]=[CH:13][C:12]=1[F:15]To a solution of 3-chloro-N-(3,4-difluoro-2-(2-fluoro-4-iodophenylamino)phenyl)-propane-1-sulfonamide (69.4 mg, 0.138 mmol) in a mixture of 8 ml 1,4-dioxane and 2 ml H2O was added KOH powder (0.674 g, 12.0 mmol) and the mixture was heated to the reflux temperature for 3 days. It was extracted using EtOAc/brine, the organic fraction was dried with Na2SO4 and the volatiles were removed. The residue was purified using flash-column chromatography (Si, DCM/MeOH 5:1, Rf=0.3). Yield: 41 mg (62%). 1H-NMR (500 MHz, MeOH [d4]): δ=7.38-7.21 (d, 1H), 7.23-7.21 (d, 1H), 7.06-7.00 (q, 1H), 6.52-6.50 (m, 1H), 6.17-6.13 (t, 1H), 3.30-3.27 (t, 2H), 2.86-2.83 (t, 2H), 2.05-2.00 (m, 2H); m/z=485 [M−1]−.
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