反应详情

To the product of Step A was added ethanol (8 mL) followed by a solution of 50% NaOH (0.96 g, 12.1 mmol) in water (8 mL). The reaction was stirred at ambient temperature for 1.5 hours. To the mixture was added dropwise 1 N HCl (28 mL), and the mixture was stirred at ambient temperature overnight. The solids were collected by filtration, washed with water (2×5 mL), and dried in a vacuum oven at 50° C. overnights to give 3-{[(2,6-difluorophenyl)amino]sulfonyl}benzoic acid: 1H NMR (400 MHz, DMSO-d6) δ ppm 7.11 (t, J=8.1 Hz, 2H), 7.33-7.41 (m, 1H), 7.71 (t, J=7.7 Hz, 1H), 7.92 (dt, J=8.4, 1.1 Hz, 1H), 8.19 (dt, J=7.8, 1.1 Hz, 1H), 8.27 (t, J=1.51 Hz, 1H), 10.20 (s, 1H), 13.48 (s, 1H); MS (ESI) m/z 312 (M−H)−.

1. stirringthe mixture was stirred at ambient temperature overnight
2. filtrationThe solids were collected by filtration
3. washwashed with water (2×5 mL)
4. customdried in a vacuum oven at 50° C. overnights