反应详情

温度

100 °C

(R)-2-methyl-piperazine (3.5 g, 34.9 mmol), 2-bromo-5-fluoro benzotrifluoride (7.74 g, 31.7 mmol), BINAP (0.59 g, 0.95 mmol), tBuONa (4.58 g, 47.65 mmol) and Pd2(dba)3 (0.29 g, 0.32 mmol) were mixed in the flask and purged with N2. Anhydrous toluene (50 mL) was added and purged with N2 again. The resulting mixture was heated in an oil bath at 100° C. under N2 for 3 hours. The mixture was cooled to room temperature, diluted with dichloromethane (150 mL), washed with H2O (30 mL) first, then washed with saturated brine (30 mL). The combined organic layer was dried over Na2SO4, concentrated down under reduced pressure to give a brown color liquid as crude. The crude product was purified on silica gel column eluted with 5-10% MeOH in DCM to give (3R)-1-[4-fluoro-2-(trifluoromethyl)phenyl]-3-methylpiperazine as a light yellow oil (6.85 g, 82%).

1. custompurged with N2
2. additionAnhydrous toluene (50 mL) was added
3. custompurged with N2 again
4. temperatureThe mixture was cooled to room temperature
5. additiondiluted with dichloromethane (150 mL)
6. washwashed with H2O (30 mL) first
7. washwashed with saturated brine (30 mL)
8. dry with materialThe combined organic layer was dried over Na2SO4
9. concentrationconcentrated down under reduced pressure
10. customto give a brown color liquid as crude
11. customThe crude product was purified on silica gel column
12. washeluted with 5-10% MeOH in DCM