反应详情

Add n-butyl lithium (35 mL, 1.6M, 55.96 mmol) over 15 minutes to 1-bromo-3-fluoro-5-benzyloxy-benzene (14.30 g, 50.87 mmol) in tetrahydrofuran (300 mL) cooled in a dry ice/acetone bath, maintaining the internal temperature <−70°. Stir 30 minutes and add N,N-dimethylformamide (7.44 g, 101.74 mmol). Stir 30 minutes and remove cold bath. After 1 hour, quench with saturated aqueous ammonium chloride. Wash organic layer with water and saturated aqueous sodium chloride. Dry (sodium sulfate), filter and concentrate to an oil. Purify on 120 g silica gel eluting with 100:0 to 90:10 hexanes:ethyl acetate to give 3.75 g (32%) of the desired compound as an oil.

1. temperaturecooled in a dry ice/acetone bath
2. temperaturemaintaining the internal temperature <−70°
3. stirringStir 30 minutes
4. customremove cold bath
5. waitAfter 1 hour
6. customquench with saturated aqueous ammonium chloride
7. dry with materialDry (sodium sulfate)
8. filtrationfilter
9. concentrationconcentrate to an oil
10. customPurify on 120 g silica gel eluting with 100:0 to 90:10 hexanes