反应详情

A tetrahydrofuran (30 ml) solution of 1-bromo-2,5-difluorobenzene (0.956 ml, 8.46 mmol) was stirred at −78° C. To the reaction mixture was added a hexane solution (6.46 ml, 10.2 mmol) of n-butyl lithium. The reaction mixture was added to a tetrahydrofuran (20 ml) solution of 6-(t-butyldiphenylsilyloxy)hexanal (2.50 g, 7.05 mmol) at −78° C. and the mixture was stirred at the same temperature for 30 minutes. After the temperature of the reaction mixture was elevated to room temperature, diethyl ether was added thereto. The mixture was washed with a saturated aqueous solution of ammonium chloride and the organic layer was dried over anhydrous sodium sulfate. After filtration, the filtrate was concentrated under reduced pressure. The residue was subjected to flash silica gel chromatography, and the fraction obtained from the hexane:ethyl acetate=9:1 eluate was concentrated under reduced pressure, whereby the title compound (2.92 g, 4.65 mmol, 88%) was obtained as a colorless oil.

1. customwas elevated to room temperature
2. washThe mixture was washed with a saturated aqueous solution of ammonium chloride
3. dry with materialthe organic layer was dried over anhydrous sodium sulfate
4. filtrationAfter filtration
5. concentrationthe filtrate was concentrated under reduced pressure
6. customthe fraction obtained from the hexane