反应详情

Under an argon atmosphere, a mixture of 2-bromo-5-chloro-toluene (20.55 g), ethyl 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoate (55.23 g), toluene (200 ml), water (125 ml), tripotassium phosphate (53.07 g) and 1,1′-bis(diphenylphosphino)ferrocene-palladium(II)dichloride-dichloromethane complex (1.633 g) was stirred with heating under reflux for 1 hr. The reaction mixture was cooled to room temperature, activated carbon (1 g) was added and the mixture was stirred for 10 min at room temperature. The insoluble material was filtered off, and the filtrate was partitioned in a separatory funnel. The organic layer was washed twice with water, dried over anhydrous sodium sulfate, and filtered. The filtrate was concentrated under reduced pressure and the obtained residue was purified by silica gel column chromatography (eluent: n-hexane/ethyl acetate=98/2) to give the title compound (27.20 g, 99%).

1. temperaturewith heating
2. temperatureunder reflux for 1 hr
3. additionactivated carbon (1 g) was added
4. stirringthe mixture was stirred for 10 min at room temperature
5. filtrationThe insoluble material was filtered off
6. customthe filtrate was partitioned in a separatory funnel
7. washThe organic layer was washed twice with water
8. dry with materialdried over anhydrous sodium sulfate
9. filtrationfiltered
10. concentrationThe filtrate was concentrated under reduced pressure
11. customthe obtained residue was purified by silica gel column chromatography (eluent: n-hexane/ethyl acetate=98/2)