Bicarbonate Ion → HCID 10755399, compound

Participants

Reaction Steps

2,2-Dimethyl-4-(2-pyridyl)-2H-1,3-benzoxazine (0.50 g) was dissolved in acetic acid (1 ml) and to the solution was added conc. sulfuric acid (3 ml) with ice-cooling. Conc. nitric acid (0.2 ml) was then added to the mixture, and the mixture was stirred for 10 minutes with ice-cooling. The reaction mixture was added slowly to a thoroughly cooled mixture of an aqueous 5N sodium hydroxide solution (50 ml) and saturated bicarbonate solution (20 ml) to quench the reaction. The mixture was extracted by addition of ethyl acetate. The mixture was successively washed with an aqueous sodium bicarbonate solution and saturated saline solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was crystallized from hexane to obtain 6-nitro-2,2-dimethyl-4-(2-pyridyl)-2H-1,3-benzoxazine (0.58 g) (Compound 11).

Provenance & Evidence