Nitric Acid → 2-Bromo-6-methyl-4-nitro-1-oxo-1lambda~5~-pyridine
반응식
[N+:1]([O-:4])(O)=[O:2].S(=O)(=O)(O)O.[Br:10][C:11]1[CH:16]=[CH:15][CH:14]=[C:13]([CH3:17])[N+:12]=1[O-:18].C(=O)(O)[O-].[Na+]>>[Br:10][C:11]1[CH:16]=[C:15]([N+:1]([O-:4])=[O:2])[CH:14]=[C:13]([CH3:17])[N+:12]=1[O-:18]참가 물질
5
반응 조건
- 온도
- 70 °C
실험 절차
Concentrated nitric acid (4 mL) was added to cold concentrated sulfuric acid (7 mL). 2-Bromo-6-methyl-pyridine 1-oxide (820 mg, 4.36 mmol) was added to this and then heated at 70° C. for 4 h. The mixture was cooled and poured slowly into ice-cold water (100 mL) and basified to pH ˜8 with sodium bicarbonate solution. This was extracted with ethyl acetate (4×50 mL) then the combined organic layers were dried over anhydrous sodium sulfate and concentrated to give a residue which was purified by washing with pentane (50 mL) to afford 2-bromo-6-methyl-4-nitro-pyridine 1-oxide (0.41 g, 40%) as a free flowing yellow solid.