反应详情

To a stirred solution of 2-bromo-5-chloro-pyridin-3-ylamine (4.12 g, 20 mmol) in anhydrous pyridine (100 mL) was added 3-methyl-4-chlorobenzenesulfonyl chloride (6.35 g, 26 mmol) and the progress of the reaction was followed by LCMS. The reaction mixture was stirred overnight (18 h), then concentrated to remove as much of the pyridine as possible. The residue was dissolved in THF and was stirred 18 h with aqueous sodium hydroxide (20 mL) in THF to cleave the bis-sulfonamide. The reaction mixture was subsequently neutralized with aqueous HCl and extracted with EtOAc; the organic phase was washed with water (2×100 mL), brine, and then dried (MgSO4), filtered, and concentrated under reduced pressure. The residue was purified by chromatography on silica gel using EtOAc-hexane to provide N-(2-bromo-5-chloro-pyridin-3-yl)-4-chloro-3-methyl-benzenesulfonamide as a white crystalline solid. MS m/z 397.1 (M+H).

1. concentrationconcentrated
2. customto remove as much of the pyridine as possible
3. dissolutionThe residue was dissolved in THF
4. stirringwas stirred 18 h with aqueous sodium hydroxide (20 mL) in THF
5. extractionextracted with EtOAc
6. washthe organic phase was washed with water (2×100 mL), brine
7. dry with materialdried (MgSO4)
8. filtrationfiltered
9. concentrationconcentrated under reduced pressure
10. customThe residue was purified by chromatography on silica gel