反应详情

Sodium hydroxide (0.18 g, 4.42 mmol, 2.0 eq) is added at room temperature to a stirred solution of 7,8-dimethoxy-3,4-dihydro-1H-quinoxalin-2-one (0.46 g, 2.21 mmol, 1.0 eq) in water (5 mL), followed by 3% hydrogen peroxide (5 mL, 14.69 mmol, 6.65 eq). The reaction mixture is heated under reflux for 3 hours, then acidified with acetic acid to pH 5. The precipitate is collected by filtration, dried under vacuum to afford 7,8-dimethoxy-quinoxalin-2-one as a brown solid (0.3 g, 65% yield).

1. temperatureThe reaction mixture is heated
2. temperatureunder reflux for 3 hours
3. filtrationThe precipitate is collected by filtration
4. customdried under vacuum