反应详情

0.78 g of ethyl iodide was added to a mixture of 0.32 g of 3-ethylsulfanyl-N-(5-trifluoromethylpyridin-2-yl)picolinamide (Compound of Present Invention 2), 0.21 g of potassium carbonate and 3 mL of acetone, and the mixture was stirred at room temperature for 1 hour. 3 mL of DMF was added to the reaction mixture, the mixture was stirred at 60° C. for 1 hour and then cooled to room temperature, and 1.0 g of ethyl iodide was added and then the mixture was stirred at 60° C. for 2 hours. Water and a saturated aqueous sodium bicarbonate solution were poured to the reaction mixture cooled to room temperature, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate and then concentrated under reduced pressure, and the resulting residue was applied to a silica gel column chromatography to obtain 0.17 g of N-ethyl-3-ethylsulfanyl-N-(5-trifluoromethylpyridin-2-yl)picolinamide (hereinafter, referred to as Compound of Present Invention 26).

1. stirringthe mixture was stirred at 60° C. for 1 hour
2. temperaturecooled to room temperature
3. stirringthe mixture was stirred at 60° C. for 2 hours
4. temperaturecooled to room temperature
5. extractionthe mixture was extracted with ethyl acetate
6. dry with materialThe organic layer was dried over anhydrous sodium sulfate
7. concentrationconcentrated under reduced pressure