反应详情

温度

60 °C

The compound (20) (40.9 g), sodium hydride (11.2 g) and dimethylformamide (200 ml) were put in a reaction vessel under a nitrogen atmosphere, and heated to 60° C. The mixture was stirred for 1 hour, then bromoethane (21) (25.2 g) dissolved in dimethylformamide (250 ml) was added dropwise thereto, and the mixture was heated to 120° C. The stirring was continued for 2 hours, and cooled slowly to room temperature, and then water (500 ml) and toluene (500 ml) were added and mixed thereto. The mixture was then allowed to stand until it had separated into two phases, the organic and aqueous phases, and an extractive operation to an organic phase was carried out. The organic phase was fractionated, and washed sequentially with water and a saturated aqueous solution of sodium hydrogencarbonate and brine, and then dried over anhydrous magnesium sulfate. The solution was concentrated under reduced pressure, and then the residue was purified with a fractional operation by means of column chromatography using a mixed solvent of toluene and ethyl acetate (toluene:ethyl acetate=25:1 by volume) as an eluent and silica gel as a stationary phase powder and dried, giving 43.2 g of 1-(4-ethoxycyclohexyl)-3-fluorobenzene (22). The yield based on the compound (20) was 92.3%.

1. additionwas added dropwise
2. temperaturethe mixture was heated to 120° C
3. waitThe stirring was continued for 2 hours
4. temperaturecooled slowly to room temperature
5. additionmixed
6. customhad separated into two phases
7. washwashed sequentially with water
8. dry with materiala saturated aqueous solution of sodium hydrogencarbonate and brine, and then dried over anhydrous magnesium sulfate
9. concentrationThe solution was concentrated under reduced pressure
10. customthe residue was purified with a fractional operation by means of column chromatography
11. customsilica gel as a stationary phase powder and dried