反应详情

温度

70 °C

8-Hydroxy-2-(4-morpholinylmethylene)-4H-1-benzopyran-4-one (261 mg, 1 mmole) is suspended in 7 ml acetonitrile in a 25 ml one neck round bottom flask under nitrogen. The suspension is treated successively with potassium carbonate (829 mg, 6 mmole) and benzyl bromide (150ul, 1.3 mmole) and the reaction mixture is warmed to 70° C. for 1 h. The mixture is cooled to room temperature and the acetonitrile is removed in vacuo. The residue is washed with 1×25 ml dichloromethane and the insoluble material is removed by filtration. The filtrate is concentrated in vacuo to a yellow oil. The oil is chromatographed over 15 g silica gel (230-400 mesh)eluting with 3% methanol/dichloromethane and collecting 6 ml fractions. Fractions 12-27 are combined and concentrated to afford a colorless oil which is crystallized from diethyl ether to provide 246 mg (70%) of the title compound as a white solid, mp. 107°-107.5° C.

1. temperatureThe mixture is cooled to room temperature
2. customthe acetonitrile is removed in vacuo
3. washThe residue is washed with 1×25 ml dichloromethane
4. customthe insoluble material is removed by filtration
5. concentrationThe filtrate is concentrated in vacuo to a yellow oil
6. customThe oil is chromatographed over 15 g silica gel (230-400 mesh)eluting with 3% methanol/dichloromethane
7. customcollecting 6 ml fractions
8. concentrationconcentrated
9. customto afford a colorless oil which
10. customis crystallized from diethyl ether