反应详情

A solution of 2-(2-oxopropyl)-4H-3,1-benzoxazin-4-one (68.2 g, 0.34 mol) and 2-hydrazinopyridine (37.1 g, 0.34 mol) in ethanol (500 mL) was heated under reflux for 1 hour. After the solution was cooled to room temperature, the resulting crude crystals were filtered. The crystals were washed with ethanol and air-dried to give the title compound (50.2 g, 51% yield).

1. temperatureunder reflux for 1 hour
2. filtrationthe resulting crude crystals were filtered
3. washThe crystals were washed with ethanol
4. customair-dried