反应详情

A mixture of 6-amino-7-fluoro-4-(2-propynyl)-2H-1,4-benzoxazin-3(4H)-one (0.31 g), 3,4,5,6-tetrahydrophthalic anhydride (0.28 g) and acetic acid (3 ml) was heated under reflux for 2 hours. After being allowed to cool, water was added to the mixture, which was then extracted with ethyl acetate. The organic layer was washed with water, neutralized with sodium bicarbonate solution, dried and concentrated. The residue was purified by silica gel thin layer chromatography using a mixture of ethyl acetate and hexane (1:2) as an eluent to give 2-[7-fluoro-4-(2-propynyl)-2H-1,4-benzoxazin-3(4H)-on-6-yl]-4,5,6,7-tetrahydro-2H-isoindole-1,3-dione (0.12 g). m.p., 196.0° C.

1. temperaturewas heated
2. temperatureunder reflux for 2 hours
3. temperatureto cool
4. extractionwas then extracted with ethyl acetate
5. washThe organic layer was washed with water
6. customdried
7. concentrationconcentrated
8. customThe residue was purified by silica gel thin layer chromatography
9. additiona mixture of ethyl acetate and hexane (1:2) as an eluent