反应详情

A mixture of 4-chloro-N-[5-chloro-2-(2-methoxy-pyridine-3-carbonyl)-pyridin-3-yl]-N-methoxymethyl-3-trifluoromethyl-benzenesulfonamide (330.06 mg, mmol) in 5% H2SO4 in TFA (2 mL) and water (1 mL) was stirred at 50° C. for overnight. The reaction mixture was cooled to room temperature, diluted with water (5 mL) and treated slowly with saturated aqueous NaHCO3 solution till pH 7-8. The mixture was extracted with EtOAc (2×25 mL), dried (anhydrous Na2SO4) and concentrated. The obtained residue was purified via column chromatography (SiO2, 5% MeOH in EtOAc) to afford 4-chloro-N-[5-chloro-2-(2-methoxy-pyridine-3-carbonyl)-pyridin-3-yl]-3-trifluoromethyl-benzene sulfonamide (15 mg) in 50% yield. ESMS m/z (relative intensity): 505.9 (M+H)+ (100), 527.9 (M+Na)+ (20).

1. extractionThe mixture was extracted with EtOAc (2×25 mL)
2. dry with materialdried (anhydrous Na2SO4)
3. concentrationconcentrated
4. customThe obtained residue was purified via column chromatography (SiO2, 5% MeOH in EtOAc)