2-(2-bromo-4,5-difluorophenyl)acetonitrile

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

Procedure: The compound (143 mg, 0.572 mmol) of Step 1 was dissolved in THF. Pyridine (0.138 mL, 1.71 mmol) was added thereto, trifluoroacetic anhydride (0.119 mL, 0.858 mmol) was added thereto at −5° C. to 0° C., and stirred at room temperature for 1 hour. The reaction solution was concentrated under reduced pressure. After diluted with ethyl acetate, the resultant was washed with 1 N hydrochloric acid, a saturated aqueous sodium hydrogen carbonate solution, and saturated brine, and then dried over anhydrous magnesium sulfate. The solvent was distilled away under reduced pressure to thus obtain the title compound without purification. The reaction solution was concentrated under reduced pressure After diluted with ethyl acetate the resultant was washed with 1 N hydrochloric acid a saturated aqueous sodium hydrogen carbonate solution, and saturated brine, and then dried over anhydrous magnesium sulfate The solvent was distilled away under reduced pressure

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

Procedure: The compound (143 mg, 0.572 mmol) of Step 1 was dissolved in THF. Pyridine (0.138 mL, 1.71 mmol) was added thereto, trifluoroacetic anhydride (0.119 mL, 0.858 mmol) was added thereto at −5° C. to 0° C., and stirred at room temperature for 1 hour. The reaction solution was concentrated under reduced pressure. After diluted with ethyl acetate, the resultant was washed with 1 N hydrochloric acid, a saturated aqueous sodium hydrogen carbonate solution, and saturated brine, and then dried over anhydrous magnesium sulfate. The solvent was distilled away under reduced pressure to thus obtain the title compound without purification. The reaction solution was concentrated under reduced pressure After diluted with ethyl acetate the resultant was washed with 1 N hydrochloric acid a saturated aqueous sodium hydrogen carbonate solution, and saturated brine, and then dried over anhydrous magnesium sulfate The solvent was distilled away under reduced pressure