反应详情

温度

-78 °C

Dissolve 1-bromo-4-(diethoxymethyl)-benzene (6.1 g, 23.55 mmol) in anhydrous THF (150 mL) and cool the solution to −78° C. Add n-butyllithium (11.3 mL, 28.26 mmol, 2.5M solution in hexane) and stir the mixture for 30 min. Add 3,3-dimethylbutyraldehyde (4.7 mL, 35.33 mmol) and stir the mixture for 1 h. Add water and EtOAc. Warm the solution to room temperature and extract the aqueous layer three times with EtOAc. Dry the combined organic extracts with Na2SO4, filter and concentrate in vacuo. Purify the crude mixture by chromatography on silica gel eluting with hexane/EtOAc (93:7) to give the desired intermediate as a colorless oil (3.8 g, 58%).

1. temperatureWarm the solution to room temperature
2. extractionextract the aqueous layer three times with EtOAc
3. dry with materialDry the combined organic extracts with Na2SO4
4. filtrationfilter
5. concentrationconcentrate in vacuo
6. customPurify the crude mixture by chromatography on silica gel eluting with hexane/EtOAc (93:7)