反应详情

An ice-cooled mixture of 4-methyl-5-nitropyridin-2-amine (1 g, 6.5 mmol), triethylamine (1.31 g, 13 mmol) in tetrahydrofuran (20 mL) was treated with cyclopropyl acetyl chloride (0.75 g, 7.1 mmol) drop wise. After complete addition the reaction mixture was stirred at room temperature for 1 hour, cooled to 0° C. and added cyclopropyl acetyl chloride (0.75 g, 7.1 mmol) followed by stirring at room temperature for 1 hour. The solvent was evaporated under vacuum and water (100 mL) was poured into the reaction mixture and extracted with ethyl acetate (2×150 mL). The organic layer was washed with aqueous sodium bicarbonate solution, dried over anhydrous sodium sulfate and concentrated under vacuum. The residue (1.5 g) was taken-up in methanol and water (4:1, 40 mL). Potassium carbonate was added to it and stirred at room temperature for 20 hours. The mixture was concentrated under vacuum. Residue was taken up in water (100 mL) and extracted with ethyl acetate (2×150 mL). The organic layer was dried over anhydrous sodium sulfate and concentrated under vacuum to get the crude compound, which upon purification by silica gel column chromatography using methanol in dichloromethane (1%) as eluent afforded N-(4-methyl-5-nitropyridin-2-yl)cyclopropanecarboxamide (0.6 g, 52%).

1. additionAfter complete addition the reaction mixture
2. temperaturecooled to 0° C.
3. stirringby stirring at room temperature for 1 hour
4. customThe solvent was evaporated under vacuum and water (100 mL)
5. additionwas poured into the reaction mixture
6. extractionextracted with ethyl acetate (2×150 mL)
7. washThe organic layer was washed with aqueous sodium bicarbonate solution
8. dry with materialdried over anhydrous sodium sulfate
9. concentrationconcentrated under vacuum
10. additionPotassium carbonate was added to it
11. stirringstirred at room temperature for 20 hours
12. concentrationThe mixture was concentrated under vacuum
13. extractionextracted with ethyl acetate (2×150 mL)
14. dry with materialThe organic layer was dried over anhydrous sodium sulfate
15. concentrationconcentrated under vacuum
16. customto get the crude compound, which
17. customupon purification by silica gel column chromatography