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温度

0 °C

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)+.

1. additionAfter addition the mixture
2. waitThe stirring was continued for 30 min
3. temperaturethe mixture was warmed to rt
4. stirringstirred overnight
5. concentrationthe mixture was concentrated
6. customThe residue was purified by flash chromatography (silica gel, CH2Cl2:MeOH/8:2)