反应详情

温度

28 °C

To a stirred solution of 6-chloro-5-nitro-1,4-dihydroquinoxaline-2,3-dione (35 mg, 0.14 mmol) in DMF (0.35 mL), N-bromosuccinimide (39 mg, 0.22 mmol) was added and the solution was stirred at 28° C. for 5 days. The resulting solution was then diluted with water (3.5 mL) and the yellow solid was filtered, washed with water (2.0 mL) and dried to obtain 42 mg crude product as a yellow powder. It was purified by successive crystallization (three times) from DMSO-water (3:1) to furnish 18 mg (44%) of pure title compound as shining yellow flakes, m.p. >350° C.; 1H NMR (DMSO-d6): δ 7.483 (s, 1H), 12.222 (s, 1H), 12.323 (brs, 1H); IR (KBr, cm-1): 3418, 3118, 1700, 1550, 1400, 1350, 1006, 675, 562.

1. filtrationthe yellow solid was filtered
2. washwashed with water (2.0 mL)
3. customdried
4. customto obtain 42 mg crude product as a yellow powder
5. customIt was purified by successive crystallization (three times) from DMSO-water (3:1)