反应详情

To ethyl 2-chloro-4-fluoro-5-{[(2-fluorophenyl)amino]sulfonyl}benzoate (1.45 g) was added ethanol (6.4 mL) followed by a solution of NaOH (0.398 g, 9.96 mmol) in water (6.4 mL). The reaction was stirred at ambient temperature for 1 hour. To the mixture was added 1 N HCl (22.8 mL), and the mixture was stirred for 30 minutes. The solids were collected by filtration, washed with water (2×4 mL), and dried in a vacuum oven at 45° C. for 2.5 days to give 2-chloro-4-fluoro-5-{[(2-fluorophenyl)amino]sulfonyl}benzoic acid: 1H NMR (400 MHz, DMSO-d6) δ ppm 13.89 (s, 1H), 10.67 (s, 1H), 8.09 (d, J=7.7, 1H), 7.88 (d, J=9.9, 1H), 7.32-7.11 (m, 4H); MS (ESI) m/z 346 (M−H)−.

1. stirringthe mixture was stirred for 30 minutes
2. filtrationThe solids were collected by filtration
3. washwashed with water (2×4 mL)
4. customdried in a vacuum oven at 45° C. for 2.5 days