Phosphorus tribromide → 5-Bromo-2-(bromomethyl)-1,3-difluorobenzene

To a solution of (4-bromo-2,6-difluorophenyl)methanol (2 g, 8.97 mmol) in DCM (80 mL) was added tribromophosphine (2.91 g, 10.76 mmol) at 0° C. The resulting mixture was stirred at rt. After LCMS analysis showed the starting material had disappeared, the mixture was washed with aq NaHCO3 (40 mL) and brine (30 mL). The organic layer was dried over Na2SO4, filtered and concentrated. The crude material was purified by silica column chromatography (PE/EA=5/1) to yield a colorless oil of 5-bromo-2-(bromomethyl)-1,3-difluorobenzene (1.6 g, 5.48 mmol, 61.2% yield): 1H NMR (400 MHz, CD3OD) δ 7.12 (d, J=6.8 Hz, 2H), 4.47 (s, 2H).

1. washthe mixture was washed with aq NaHCO3 (40 mL) and brine (30 mL)
2. dry with materialThe organic layer was dried over Na2SO4
3. filtrationfiltered
4. concentrationconcentrated
5. customThe crude material was purified by silica column chromatography (PE/EA=5/1)

ORD record

ord-552e8ed309af4323941702b5a8d6a236

Source dataset

uspto-grants-2015_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08937071B2