反应详情

To a flask charged with 2-((2-methoxy-4-(trifluoromethyl)phenyl)amino)-5-nitrophenol (1.75 g, 5.33 mmol) and cesium carbonate (8.69 g, 26.7 mmol) was added DMF (21.33 ml) followed by chloroacetyl chloride (0.854 ml, 10.66 mmol), dropwise over 5 min. The resulting solution was maintained at rt for 1 h. Quenched reaction with saturated ammonium chloride (25 mL) and diluted with EtOAc (25 mL). Separated layers, and extracted aqueous layer with EtOAc (3×25 mL). The combined organic layers were dried over Na2SO4, filtered, and concentrated via rotary evaporation to provide 4-(2-methoxy-4-(trifluoromethyl)phenyl)-7-nitro-2H-benzo[b][1,4]oxazin-3(4H)-one (2.10 g, 5.70 mmol, 107% yield) as a yellow solid. The crude product was used in the next step without further purification.

1. customQuenched
2. customreaction with saturated ammonium chloride (25 mL)
3. extractionSeparated layers, and extracted aqueous layer with EtOAc (3×25 mL)
4. dry with materialThe combined organic layers were dried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated via rotary evaporation