Methanesulfonic Acid → 3-Bromo-6-fluoro-2-methylbenzonitrile

Participants

Reaction Conditions

Reaction Steps

To a 3 L 3 Neck round bottomed flask equipped with overhead stirrer was charged 2-fluoro-6-methyl-benzonitrile (191.8 g., 1419 mmol) and MsOH (563 mL, 8516 mmol). NBS (265 g., 1490 mmol) was added portionwise to this stirred solution over 30 minutes, and the mixture was stirred at 50° C. for 33 hours. The reaction was poured into 1 L of ice, diluted with 700 mL 30% EtOAc/Hexanes, and agitated. The aqueous layer was cut, and the organics washed twice with 1N NaOH and then with water. The organics were dried over MgSO4, concentrated, then stored in a −10° C. freezer overnight. Precipitate formed over this time, and was filtered and washed with 5% EtOAc/Hexanes, providing a first crop of product. A second crop of precipitate provided additional 3-Bromo-6-fluoro-2-methyl-benzonitrile.

Provenance & Evidence