反应详情

9-Borabicyclo[3,3,1]nonane (9-BBN) (tetrahydrofuran solution, 0.5 mol/L, 33 mL, 16.5 mmol) was added dropwise to a solution of vinylcyclopentane (1.59 g, 16.5 mmol) in tetrahydrofuran (7.5 mL) at 0° C. under a nitrogen atomosphere. The mixture was warmed gradually to room temperature and stirred for 15 hr. To the reaction mixture were added dichloro[1,1′-bis(diphenylphosphino)ferrocene]palladium(II) (367 mg, 0.45 mmol), 4-bromo-2-fluoroaniline (2.85 g, 15.0 mmol) and 3 mol/L aqueous sodium hydroxide solution (15 mL, 45.0 mmol), and the mixture was heated to reflux for 10 hr. After cooling, ethyl acetate was added thereto, the mixture was filtered through Celite (registered trademark), and the filtrate was concentrated under reduced pressure. Water was added thereto, the mixture was extracted with ethyl acetate, and the organic layer was washed with brine. After drying over anhydrous magnesium sulfate, the desiccant was filtered off, followed by concentration under reduced pressure. The resulting residue was purified by silica gel column chromatography (hexane:ethyl acetate=9:1) to afford the title compound as a pale yellow oil (3.01 g).

1. temperaturethe mixture was heated
2. temperatureto reflux for 10 hr
3. temperatureAfter cooling
4. filtrationthe mixture was filtered through Celite (registered trademark)
5. concentrationthe filtrate was concentrated under reduced pressure
6. additionWater was added
7. extractionthe mixture was extracted with ethyl acetate
8. washthe organic layer was washed with brine
9. dry with materialAfter drying over anhydrous magnesium sulfate
10. filtrationthe desiccant was filtered off
11. concentrationfollowed by concentration under reduced pressure
12. customThe resulting residue was purified by silica gel column chromatography (hexane:ethyl acetate=9:1)