Succinic anhydride → 4-{4-[5-amino-1-(2,6-difluoro-benzoyl)-1H-[1,2,4]triazol-3-ylamino]-benzenesulfonylamino}-4-oxo-butyric acid

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To a nitrogen purged flask was added 4-[5-amino-1-(2,6-difluorobenzoyl)-1H-[1,2,4]triazol-3-ylamino]-benzenesulfonamide Compound 1a (0.10 g, 0.25 mmol) and THF (10 mL). The mixture was cooled to 0° C. and potassium tert-butoxide (0.28 mL, 1.0 M solution in THF) was added dropwise. After addition the mixture was stirred at 0° C. for 1 hr, then succinic anhydride (28 mg in 5 mL THF, 0.28 mmol) was added dropwise. The stirring was continued for 30 min, then the mixture was warmed to rt and stirred overnight. A few drops of acetic acid was added, then the mixture was concentrated. The residue was purified by flash chromatography (silica gel, CH2Cl2:MeOH/8:2) to afford the desired product (39 mg, 31%) as a white solid. 1H NMR (300 MHz, CD3OD) δ 7.70 (d, 2H), 7.63 (m, 1H), 7.42 (d, 2H), 7.15 (t, 2H), 2.41 (br s, 4H); MS (ESI) m/z: 493 (M+H)+.

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