反应详情

N-(2,4-Dichloro-6-methylpyridin-3-yl)-2-[4-(2-hydroxyethyl)piperazin-1-yl]acetamide (58.0 g, 167.0 mmol) and 18-crown-6 (4.41 g, 16.7 mmol) were dissolved in dimethyl sulfoxide (580 mL), and sodium thiomethoxide powder (46.8 g, 667.7 mmol) was added to the solution under stirring and under cooling with ice, followed by stirring for 2.5 hours at an inner temperature of 65-75° C. The reaction mixture was allowed to cool to room temperature, and water was added to the mixture under cooling with ice, followed by extraction with chloroform. The aqueous layer was extracted with chloroform. The combined organic layer was washed with saturated brine and concentrated under reduced pressure. The residue was recrystallized from isopropanol and diisopropyl ether, to thereby yield 43.83 g of 2-[4-(2-hydroxyethyl)piperazin-1-yl]-N-[2,4-bis(methylthio)-6-methylpyridin-3-yl]acetamide (yield: 71%) as colorless crystals.

1. temperatureunder cooling with ice
2. stirringby stirring for 2.5 hours at an inner temperature of 65-75° C
3. temperatureunder cooling with ice
4. extractionfollowed by extraction with chloroform
5. extractionThe aqueous layer was extracted with chloroform
6. washThe combined organic layer was washed with saturated brine
7. concentrationconcentrated under reduced pressure
8. customThe residue was recrystallized from isopropanol and diisopropyl ether