反应详情

0.5 g (1.4 mmol) 5-Bromo-8-ethoxalylamino-7-nitroquinoline in 30 ml ethanol was hydrogenated at atm. pressure by using 100 mg (5%) Pt/c as a catalyst. The reaction mixture was filtered and the filtrate was evaporated in vacuo. The residue was stirred with water and the precipitate was filtered off. The crude product was washed with ethanol to give 0.3 g (72%) of 6-Bromo-4-hydroxypyrido[2,3-f]quinoxaline-2,3(1H,4H)-dione. M.p. decomp. MS m/z: 307 (M+, 20%), 291 (70%), 156 (100%), 128 (70%).

1. filtrationThe reaction mixture was filtered
2. customthe filtrate was evaporated in vacuo
3. filtrationthe precipitate was filtered off
4. washThe crude product was washed with ethanol