反应详情

To Pd(PPh3)4 (2.1 g, 1.823 mmol) was added 3-fluorophenylmagnesium bromide (55 mls, 1.0 M in THF, 55 mmol) at 0° C. over 15 minutes. The ice bath was removed and the mixture was stirred for 30 minutes. 1-(4-Bromophenyl)-2,2,2-trifluoroethanol (4.65 g, 18.23 mmol) in THF (50 mls) was added over 10 minutes. The mixture was heated to reflux for 3 hours and was shown complete by LC (Sunfire column, TFA). The mixture was cooled, quenched with H2O, rotary evaporated to remove most of the THF, and extracted 3 times with CH2Cl2. The organics were combined washed with brine, dried over MgSO4, and concentrated. Chromatography (SiO2, CH2Cl2) gave 4.64 g of 2,2,2-trifluoro-1-(3′-fluorobiphenyl-4-yl)ethanol. Yield 94%.

1. customThe ice bath was removed
2. temperatureThe mixture was heated
3. temperatureto reflux for 3 hours
4. temperatureThe mixture was cooled
5. customquenched with H2O
6. customrotary evaporated
7. customto remove most of the THF
8. extractionextracted 3 times with CH2Cl2
9. washThe organics were combined washed with brine
10. dry with materialdried over MgSO4
11. concentrationconcentrated