反应详情

To a solution of 5-bromo-2-iodobenzotrifluoride (5.00 g) in dehydrated tetrahydrofuran (140 mL), n-butyl lithium (2.69 mol/L, solution in n-hexane, 5.30 mL) was added at −78° C. and the mixture was stirred at that temperature for 25 minutes. After adding a solution of cyclobutanone (999 mg) in tetrahydrofuran (5.00 mL), the mixture was brought to room temperature and stirred for 3 days. After adding a saturated aqueous solution of ammonium chloride under cooling with ice, two extractions were conducted with ethyl acetate. The combined organic layers were washed with water and thereafter dried over anhydrous magnesium sulfate. After removing the desiccant by filtration, the filtrate was concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=98:2-80:20) to give 1-[4-bromo-2-(trifluoromethyl)phenyl]cyclobutanol as a pale yellow oil (3.00 g).

1. customwas brought to room temperature
2. stirringstirred for 3 days
3. temperatureunder cooling with ice, two extractions
4. washThe combined organic layers were washed with water
5. dry with materialdried over anhydrous magnesium sulfate
6. customAfter removing the
7. filtrationdesiccant by filtration
8. concentrationthe filtrate was concentrated under reduced pressure
9. customThe resulting residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=98:2-80:20)