反应详情

A solution of 6-nitro-3,4-dihydro-2H-benzo[b][1,4]oxazine (0.7 g, 3.89 mmol) in acetic anhydride (1.9 mL) and EtOAc (7 mL) was heater under reflux with stirring. After 15 h, the mixture was concentrated under reduced pressure to give 1-(6-nitro-2H-benzo[b][1,4]oxazin-4(3H)-yl)ethanone as a yellow solid, which was carried on crude without purification: Mass Spectrum (ESI) m/e=223.0 (M+1).

1. temperatureunder reflux
2. concentrationthe mixture was concentrated under reduced pressure