反应详情

To a solution of 5-[(2,5-difluorophenyl)[(4-fluorophenyl)sulfonyl]methyl]-4-methylpyridine-2-carboxylic acid (114 mg, 0.271 mmol) obtained in Example 12 in methylene chloride (3 ml), piperazin-2-one (33 mg, 0.325 mmol), 1-hydroxybenzotriazole (37 mg, 0.271 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (62 mg, 0.325 mmol) and 4-methylmorpholine (35 μl, 0.325 mmol) were added. The reaction mixture was stirred for 4 days at room temperature, and was concentrated under reduced pressure. Ethyl acetate was added to the resulting concentration residue, and the mixture was washed sequentially with saturated aqueous sodium hydrogencarbonate and saturated brine. The organic layer was dried over anhydrous sodium sulfate and filtered, and then the filtrate was concentrated under reduced pressure. The resulting concentration residue was subjected to silica gel column chromatography, and the fraction obtained from an elution with methanol:methylene chloride (=1:30) was concentrated under reduced pressure. The resulting solid was washed with ether, and then was collected by filtration, to obtain the title compound (116 mg, 0.230 mmol, 85%) as a white powder.

1. concentrationwas concentrated under reduced pressure
2. additionEthyl acetate was added to the resulting concentration residue
3. washthe mixture was washed sequentially with saturated aqueous sodium hydrogencarbonate and saturated brine
4. dry with materialThe organic layer was dried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationthe filtrate was concentrated under reduced pressure
7. concentrationThe resulting concentration residue
8. customthe fraction obtained from an elution with methanol
9. concentrationmethylene chloride (=1:30) was concentrated under reduced pressure
10. washThe resulting solid was washed with ether
11. filtrationwas collected by filtration