反应详情

To a solution of 70 g of 3-ethoxy-2-methylpyridine (Compound II where R2 =C2H5) dissolved in 280 ml of sulfuric acid under ice-cooling, a mixed solution of 42 ml of fuming nitric acid and 50 ml of concentrated sulfuric acid was added dropwise while stirring and keeping the internal temperature at 0° to 3° C. After stirring for additional 30 minutes at the same temperature, the reaction mixture was poured into ice water and extracted with chloroform. The extract was washed with water, dried over anhydrous sodium sulfate and concentrated to give 85 g of 3-ethoxy-2-methyl-6-nitropyridine (Compound III where R2 =C2H5), m.p. 90°-92° C.

1. temperaturecooling
2. customat 0° to 3° C
3. stirringAfter stirring for additional 30 minutes at the same temperature
4. extractionextracted with chloroform
5. washThe extract was washed with water
6. dry with materialdried over anhydrous sodium sulfate
7. concentrationconcentrated