Potassium Nitrate → HCID 19827792, compound

Participants

Reaction Steps

To a solution of 0.5 g (2.4 mmol) 7-methoxy-1-methylquinoxaline-2,3(1H,4H)-dione in 20 ml concentrated sulfuric acid was added at 0° C. 0.25 g (2.48 mmol) potassium nitrate. Stirring was continued at 0° C. for 30 min, and then at 25° C. for 90 min. The reaction mixture was poured into 100 ml ice-water to give 0.51 g (84% of 7-methoxy-1-methyl-6-nitroquinoxaline-2,3(1H,4H)-dione as a precipitate. M.p. 343° C. NMR (DMSO-d6): 11.9 (1H, broad s), 7.67 (1H, s), 7.0 (1H, s), 3.97 (3H, s), 3.53 (3H, s).

Provenance & Evidence