反应详情

温度

-35 °C

To a solution of 4-fluoro-3-nitrobenzenesulfonyl chloride (43 g, 179.5 mmol) in THF (500 mL), was added triethylamine (150 mL, 1.08 mol). The mixture was cooled to −35° C. and methylamine hydrochloride (14.5 g, 215.4 mmol) in water was added dropwise. After 1 h, the mixture was warmed to room temperature and diluted with 1:1 water/ethyl acetate. The organic layer was separated and washed with saturated aqueous sodium bicarbonate, then brine, dried over MgSO4, filtered and concentrated in vacuo. The crude residue was purified via column chromatography (20% ethyl acetate/petroleum ether) to give 4-fluoro-N-methyl-3-nitrobenzenesulfonamide (38 g, 90% yield) as a yellow solid.

1. temperaturethe mixture was warmed to room temperature
2. customThe organic layer was separated
3. washwashed with saturated aqueous sodium bicarbonate
4. dry with materialbrine, dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe crude residue was purified via column chromatography (20% ethyl acetate/petroleum ether)