反应详情

温度

50 °C

A mixture of 4-chloro-N-[5-chloro-2-(2-methoxy-pyridine-3-carbonyl)-pyridin-3-yl]-3-trifluoromethyl-benzene sulfonamide (10 mg, mmol) in 30% HBr in AcOH (1 mL) was stirred at 50° C. for 2 h. The reaction mixture was cooled to room temperature, diluted with water (1 mL) and treated with saturated aqueous NaHCO3 solution slowly till pH 5-6. The mixture was extracted with EtOAc (2×25 mL), dried (anhydrous Na2SO4) and concentrated. The obtained residue was column purified (SiO2, 10% MeOH in CH2Cl2) to afford 4-chloro-N-[5-chloro-2-(2-hydroxy-pyridine-3-carbonyl)-pyridin-3-yl]-3-trifluoromethyl-benzenesulfonamide (6 mg) in 61.8% yield. 1H NMR (400 MHz, CDCl3) δ 8.24 (d, 1 H), 8.17 (d, 1 H), 8.15 (d, 1 H), 7.97 (dd, 1 H), 7.72 (dd, 1 H), 7.63 (d, 1 H), 7.43 (dd, 1 H), 6.37 (t, 1 H); ESMS m/z (relative intensity): 491.9 (M+H)+(100).

1. temperatureThe reaction mixture was cooled to room temperature
2. extractionThe mixture was extracted with EtOAc (2×25 mL)
3. dry with materialdried (anhydrous Na2SO4)
4. concentrationconcentrated
5. custompurified (SiO2, 10% MeOH in CH2Cl2)