反应详情

To the solution of the compound obtained in Example 66 (391 mg, 0.80 mmol), picolinic acid (108 mg, 88 mmol) and 1-hydroxybenzotriazole (119 mg, 0.88 mmol) in DMF (8 mL) was added 1-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (307 mg, 1.60 mmol), and the mixture was stirred at room temperature for 20 hours. The reaction mixture was concentrated under reduced pressure, and to the concentrate were added a saturated aqueous solution of sodium hydrogen carbonate (15 mL) and water (5 mL). The mixture was extracted with ethyl acetate (15 mL×5). The organic layer was washed with a saturated aqueous solution of sodium hydrogen carbonate (5 mL×3), saturated sodium chloride solution (5 mL), successively, dried over anhydrous sodium sulfate and concentrated under reduced pressure. The concentrate was subjected to column chromatography (silica gel 10 g, ethyl acetate/methanol=1/0 to 9/1), and the desired fraction was concentrated under reduced pressure to give the titled compound (433 mg, 0.73 mmol, Yield 91%).

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. additionto the concentrate were added a saturated aqueous solution of sodium hydrogen carbonate (15 mL) and water (5 mL)
3. extractionThe mixture was extracted with ethyl acetate (15 mL×5)
4. washThe organic layer was washed with a saturated aqueous solution of sodium hydrogen carbonate (5 mL×3), saturated sodium chloride solution (5 mL)
5. dry with materialsuccessively, dried over anhydrous sodium sulfate
6. concentrationconcentrated under reduced pressure
7. concentrationthe desired fraction was concentrated under reduced pressure