反应详情

To a suspension of cesium carbonate (20.2 g, 0.065 mol) in acetonitrile (500 mL) at room temperature was added N-methylmethanesulfonamide (5.33 g, 0.049 mol) and 1-fluoro-2-nitrobenzene (4.59 g, 0.033 mol) dropwise over 10-15 minutes. The reaction was stirred at room temperature for 12 hours. Upon completion, the mixture was filtered and then concentrated. The residue was purified by silica gel chromatography (dichloromethane) to afford the product N-methyl-N-(2-nitrophenyl)methanesulfonamide (4.2 g, yield 56.1%). 1H NMR (400 MHz, DMSO-d6) δ ppm 7.92-7.94 (dd, 1H, J=1.2 Hz, 8.0 Hz), 7.74-7.81 (m, 2H), 7.57-7.62 (m, 1H), 3.27 (s, 3H), 3.03 (s, 3H).

1. filtrationUpon completion, the mixture was filtered
2. concentrationconcentrated
3. customThe residue was purified by silica gel chromatography (dichloromethane)