反应详情

A mixture of 4-chloro-N-[5-chloro-2-(2-chloro-3-methyl-benzoyl)-pyridin-3-yl]-N-methoxymethyl-3-trifluoromethyl-benzenesulfonamide (58.6 mg, 1.03 mmol) in 4 N HCl in dioxane (4 mL) and water (1 mL) was stirred at 100° C. for overnight. The reaction mixture was cooled to room temperature, evaporated to dryness and treated 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, 70% EtOAc in hexanes) to afford 4-chloro-N-[5-chloro-2-(2-chloro-3-methyl-benzoyl)-pyridin-3-yl]-3-trifluoromethyl-benzenesulfonamide (34.5 mg) in 64% yield. 1H NMR (400 MHz, CDCl3) δ11.00 (s, 1H), 8.24 (d, 1H), 8.18 (m, 1H), 8.17 (d, 1H), 7.98 (dd, 1H), 7.63 (d, 1H), 7.35 (d, 1H), 7.24 (t, 1H), 7.1 (d, 1H), 2.37 (s, 3H); ESMS m/z (relative intensity): 522.9 (M+H)+ (100), 544.9 (M+Na)+ (100).

1. customevaporated to dryness
2. additiontreated with saturated aqueous NaHCO3 solution till pH 7-8
3. extractionThe mixture was extracted with EtOAc (2×25 mL)
4. dry with materialdried (anhydrous Na2SO4)
5. concentrationconcentrated
6. customThe obtained residue was purified via column chromatography (SiO2, 70% EtOAc in hexanes)