Bromobenzene → 2,4-Difluoro-1,1'-biphenyl

Temperatur

90 °C

2,4-Difluorophenylboronic acid (15 g, 129 mmol) was added to a solution of bromobenzene (19.8 g, 126 mmol) in DME (500 mL). To this was added a solution of sodium carbonate (55.8 g, 520 mmol) in water (260 mL). The solution was degassed by bubbling argon through the mixture and then stirred under argon. Pd(dppf)Cl2 (1.5 g, 2.1 mmol) was added and the mixture heated overnight at 90° C. under argon. The mixture was cooled to room temperature and water (150 mL) and ethyl acetate (500 mL) were added. The layers were separated and the organic layer was washed with 2 M NaOH (100 mL), water (100 mL) and brine (100 mL). The black ethyl acetate layer was dried over MgSO4, charcoal was added, and the mixture was filtered through a short pad of silica. Evaporation of the solvents gave 2,4-difluorobiphenyl as a brown oil, which crystallised on standing (21.2 g).

1. customThe solution was degassed
2. customby bubbling argon through the mixture
3. temperatureThe mixture was cooled to room temperature
4. customThe layers were separated
5. washthe organic layer was washed with 2 M NaOH (100 mL), water (100 mL) and brine (100 mL)
6. dry with materialThe black ethyl acetate layer was dried over MgSO4, charcoal
7. additionwas added
8. filtrationthe mixture was filtered through a short pad of silica
9. customEvaporation of the solvents

ORD-Eintrag

ord-8fe20a3afea14cd4be0abc077752b757

Quelldatensatz

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08822507B2