反应详情

A mixture of 2,6-lutidine 1-oxide (20, 15 g, 110 mmol) and concentrated sulfuric acid (98%, 30 ml) and concentrated nitric acid (70%, 12 ml) is heated under reflux for 3 hours. The mixture is poured into a large excess of ice and extracted with chloroform (3×100 ml). The combined chloroform extracts are washed with aqueous sodium hydroxide and water and dried over magnesium sulfate. Removal of the solvent yields pure yellow solid 4-Nitro-2,6-lutidine 1-oxide (21). 1H NMR (300 MHz, CDCl3) δ 2.64 (s, 6H), 8.08 (s, 2H). MS, m/z 169 (M+1), 210 (M+MeCN).

1. temperatureis heated
2. temperatureunder reflux for 3 hours
3. additionThe mixture is poured into a large excess of ice
4. extractionextracted with chloroform (3×100 ml)
5. washThe combined chloroform extracts are washed with aqueous sodium hydroxide and water
6. dry with materialdried over magnesium sulfate
7. customRemoval of the solvent