反应详情

温度

25 °C

4-Ethoxy-2,3-difluorophenylboronic acid (7) (14.4 g), 4-bromoiodobenzene (8) (20.0 g), potassium carbonate (29.3 g), Pd(Ph3P)2Cl2 (1.49 g), toluene (100 ml), Solmix A-11 (100 ml) and water (100 ml) were put in a reaction vessel under a nitrogen atmosphere, and heated under reflux for 2 hours. The reaction mixture was cooled to 25° C., and then poured into water (500 ml) and toluene (500 ml), and mixed. The mixture was then allowed to separate into organic and aqueous phases. The extraction into an organic phase was carried out. The organic phase obtained was washed with water and dried over anhydrous magnesium sulfate. Then, the solution was concentrated under reduced pressure, and the residue obtained was purified by means of column chromatography (silica gel; toluene). The product was further purified by means of recrystallization (Solmix A-11), giving 20.8 g of 4-ethoxy-4′-bromo-2,3-difluoro-1,1′-biphenyl (9). The yield based on the compound (8) was 94.0%.

1. temperatureheated
2. temperatureunder reflux for 2 hours
3. additionmixed
4. customto separate into organic and aqueous phases
5. extractionThe extraction into an organic phase
6. customThe organic phase obtained
7. washwas washed with water
8. dry with materialdried over anhydrous magnesium sulfate
9. concentrationThen, the solution was concentrated under reduced pressure
10. customthe residue obtained
11. customwas purified by means of column chromatography (silica gel; toluene)
12. customThe product was further purified by means of recrystallization (Solmix A-11)