反应详情

To a solution of methyl 3-amino-2,6-difluorobenzoate (530 mg, 2.83 mmol) and pyridine (0.28 mL, 3.40 mmol) in 10 mL CH2Cl2 was added methanesulfonyl chloride (0.24 mL, 3.11 mmol). After 24 h at room temperature, the reaction mixture was washed with saturated aqueous NaHCO3 and extracted with CHCl3 to provide crude methyl 2,6-difluoro-3-[(methylsulfonyl)amino]benzoate as a solid (ESI-MS 264 (M−H)), which was hydrolyzed using aqueous NaOH to provide 2,6-difluoro-3-[(methylsulfonyl)amino]benzoic acid (ESI-MS 250 (M−H)), which was used without further purification.

1. washthe reaction mixture was washed with saturated aqueous NaHCO3
2. extractionextracted with CHCl3