反应详情

1-(piperazin-1-yl)piperidin-2-one (0.44 g) obtained in Example 8b), (2S)-3-[(6-chloronaphthalen-2-yl)sulfony]-2-hydroxypropionic acid (0.76 g), HOBt (0.37 g) and triethylamine (0.34 mL) were dissolved in DMF (10 mL), WSC (0.46 g) was added thereto, and the mixture was stirred at room temperature for 15 hours. The reaction mixture was concentrated under reduced pressure, and the residue was diluted with an aqueous sodium bicarbonate solution, and extracted with dichloromethane. The extract was washed with an aqueous sodium bicarbonate solution and dried over sodium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate to ethyl acetate/methanol=10/1), and recrystallized form ethyl acetate to obtain the title compound (0.32 g, 28%) as a colorless powder.

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. additionthe residue was diluted with an aqueous sodium bicarbonate solution
3. extractionextracted with dichloromethane
4. washThe extract was washed with an aqueous sodium bicarbonate solution
5. dry with materialdried over sodium sulfate
6. distillationthe solvent was distilled off under reduced pressure
7. customThe residue was purified by silica gel column chromatography (ethyl acetate to ethyl acetate/methanol=10/1)
8. customrecrystallized
9. customform ethyl acetate