反应详情

4-Pyridinecarbaldehyde (0.64 ml, 6.8 mmol) was added to a methanol solution (10 ml) of 7-(3-aminopropoxy)-1-ethyl-3,3,5-trimethyl-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione (2.18 g, 6.8 mmol), and stirred under a nitrogen atmosphere at room temperature for 1.5 hours. The reaction mixture was cooled in an ice water bath, and sodium borohydride (257 mg, 6.8 mmol) was added thereto at 0° C. The mixture was then stirred at room temperature overnight. Water was added to the reaction mixture, and extraction with ethyl acetate was performed. The organic layer was washed with water and a saturated sodium chloride aqueous solution, in this order, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:methanol=9:1→3:2). The purified product was concentrated under reduced pressure to thereby obtain 2.35 g (yield: 84%) of 1-ethyl-3,3,5-trimethyl-7-{3-[(pyridin-4-ylmethyl)amino]propoxy}-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione as a pale yellow oil.

1. temperatureThe reaction mixture was cooled in an ice water bath
2. customat 0° C
3. stirringThe mixture was then stirred at room temperature overnight
4. washThe organic layer was washed with water
5. dry with materiala saturated sodium chloride aqueous solution, in this order, dried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by silica gel column chromatography (ethyl acetate:methanol=9:1→3:2)
8. concentrationThe purified product was concentrated under reduced pressure