反应详情

To a solution of NaH (2.5 g) in DMF (200 mL) was added quinoxaline-2,3(1H,4H)-dione (5 g) in portions, followed by the slow addition of methyl iodide (3.8 mL). The reaction mixture was stirred at ambient temperature for 4 hours, then water was added (200 mL) The resulting precipitate was collected by filtration and washed with water to afford 1,4-dimethylquinoxaline-2,3(1H,4H)-dione as a white solid in 95% yield. 1H NMR (400 MHz, DMSO-d6): δ, ppm: 3.50 (s, 6H), 7.25 (m, 2H), 7.38 (m, 4H).

1. filtrationwas collected by filtration
2. washwashed with water