反应详情

To a stirred solution of 6-amino-1,4,4-trimethyl-1,4-dihydro-2H-3,1-benzoxazin-2-one (0.15 g, 0.73 mmol) in methylene chloride (5 mL) at 0° C. was added triethylamine (0.15 mL, 1.07 mmol). After 10 minutes, 2,3-dichlorobenzenesulfonyl chloride (0.27 g, 1.10 mmol) was added. The solution was stirred for 5 hours, then partitioned between ammonium chloride solution (sat.) and methylene chloride. The organic layer was dried over magnesium sulfate and concentrated. Flash silica gel column separation with 30% ethyl acetate/hexane followed by trituration with ether gave 2,3-dichloro-N-(1,4,4-trimethyl-2-oxo-1,4-dihydro-2H-3,1-benzoxazin-6-yl)benzenesulfonamide as an off-white solid (0.015 g, 5%). 1H NMR (DMSO-d6): δ 10.17 (s, 1H), 8.02 (dd, J=7.9, 1.4 Hz, 1H), 7.93 (dd, J=8.1, 1.4 Hz, 1H), 7.56 (t, J=8.0 Hz, 1H), 7.03 (m, 3H), 3.20 (s, 3H), 1.48 (s, 6H). MS (ESI) m/z 415/417/419 ([M+H]+); MS (ESI) m/z 413/415/417 ([M−H]−).

1. custompartitioned between ammonium chloride solution (sat.) and methylene chloride
2. dry with materialThe organic layer was dried over magnesium sulfate
3. concentrationconcentrated
4. customFlash silica gel column separation with 30% ethyl acetate/hexane