3-bromo-2,6-difluorobenzonitrile

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of compound 2,6-difluorobenzonitrile (5 g, 36 mmol) in concentrated sulfuric acid (25 mL) was added with NBS (7 g, 39.6 mmol) at 0° C. and stirred at ambient temperature for 2 days. Ice was added to the reaction solution. The mixture was extracted with EtOAc. The organic layer was washed with water, saturated NaHCO3 solution, brine, dried over anhydrous sodium sulfate and concentrated. The residue was purified with fast column chromatograph to give compound 3-bromo-2,6-difluorobenzonitrile. 1H-NMR (400 MHz, CDCl3) δ ppm 7.78˜7.83 (m, 1H), 6.98˜7.03 (m, 1H). Ice was added to the reaction solution The mixture was extracted with EtOAc The organic layer was washed with water, saturated NaHCO3 solution, brine dried over anhydrous sodium sulfate concentrated The residue was purified with fast column chromatograph