反应详情

To a stirred solution of NH4OH (30 mL) was added a solution of 2-chloro-4-(2-methyl-3-oxobutan-2-yl)benzene-1-sulfonyl chloride (9.8 g, 33.2 mmol) in THF (150 mL) at 0° C. After stirring 2 h, volatiles were removed under reduced pressure. The residue was diluted with water and extracted with EtOAc (100 mL×2). The combined extracts were dried over MgSO4, concentrated and purified by column chromatography (Hex/EtOAc=4:1 to 2:1) to give 2-chloro-4-(2-methyl-3-oxobutan-2-yl)benzenesulfonamide (8.9 g, 96% yield) as yellow oil. 1H NMR (400 MHz, CDCl3) δ 8.09 (d, J=8.4 Hz, 1H), 7.43 (s, 1H), 7.27 (d, J=2.2 Hz, 1H), 5.09 (s, 2H), 2.04 (s, 3H), 1.52 (s, 6H).

1. customvolatiles were removed under reduced pressure
2. additionThe residue was diluted with water
3. extractionextracted with EtOAc (100 mL×2)
4. dry with materialThe combined extracts were dried over MgSO4
5. concentrationconcentrated
6. custompurified by column chromatography (Hex/EtOAc=4:1 to 2:1)