反应详情

To a solution of N-(3-(4-bromophenyl)-2,2,6,7-tetramethyl-2,3-dihydro-1-benzofuran-5-yl)-3,3-dimethylbutanamide (500 mg, 1.13 mmol) obtained in Example 284 in THF (10 mL) was added dropwise at −78° C. under an argon atmosphere n-butyllithium (1.59 M hexane solution, 1.56 mL, 2.48 mmol), and the mixture was stirred for 30 minutes. DMF (90 mg, 1.24 mmol) was added to the reaction solution at the same temperature, and the mixture was stirred for 30 minutes, warmed to room temperature, and stirred for 1 hour. Water was added to the reaction solution and the product was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane=2:3) and recrystallized from ethyl acetate-hexane to obtain 204 mg (yield: 46%) of the title compound. Melting point: 169-170° C.

1. stirringthe mixture was stirred for 30 minutes
2. stirringstirred for 1 hour
3. extractionthe product was extracted with ethyl acetate
4. washThe organic layer was washed with water and saturated brine
5. dry with materialdried over anhydrous sodium sulfate
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by silica gel column chromatography (ethyl acetate:hexane=2:3)
8. customrecrystallized from ethyl acetate-hexane