反应详情

温度

120 °C

To concentrated sulfuric acid (45 mL) was added ethanol (100 mL) under ice-cooling, followed by adding 2-cyano-4-methyl-5-nitropyridine (3.54 g), and the reaction vessel was equipped with a reflux condenser, and the mixture was stirred at 120° C. for 2 hours. The reaction mixture was cooled to room temperature. The reaction mixture was poured into ice, and the resulting mixture was extracted with diethyl ether. The water layer was extracted with methylene chloride. The extracts were combined, and dried over anhydrous magnesium sulfate. The solvent was removed under reduced pressure, and the residue was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate=3/1) to give the title compound (3.23 g).

1. temperaturecooling
2. customthe reaction vessel was equipped with a reflux condenser
3. temperatureThe reaction mixture was cooled to room temperature
4. additionThe reaction mixture was poured into ice
5. extractionthe resulting mixture was extracted with diethyl ether
6. extractionThe water layer was extracted with methylene chloride
7. dry with materialdried over anhydrous magnesium sulfate
8. customThe solvent was removed under reduced pressure
9. customthe residue was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate=3/1)