Potassium Nitrate → HCID 19827808, compound

Participants

Reaction Steps

To a solution of 0.2 g (0.97 mmol) 6-methoxy-1-methylquinoxaline-2,3(1H,4H)-dione in 10 ml concentrated sulfuric acid was added at 0° C. 0.1 g (0.99 mmol) potassium nitrate. Stirring was continued at 0° C. for 30 min., and then at 25° C. for 1 h. The reaction mixture was poured into 50 ml ice-water to give a precipitate Recrystallization (dimethylformamide-water) of the crude product gave 0.15 g (62%) 6-methoxy-1-methyl-7-nitroquinoxaline-2,3(1H,4H)-dione. M.p. 356° C. NMR (DMSO-d6): 12.0 (1H, broad s), 7.77 (1H, s), 3.90 (3H, s), 3.47 (3H, s).

Provenance & Evidence