Carbon Dioxide → 2,6-Difluoropyridine-3-carboxylic acid

Participants

Reaction Steps

To 2,6-difluoropyridine (58, 7.10 g, 0.0617 mol) in tetrahydrofuran (150.0 mL) under an atmosphere of nitrogen at −78° C., n-butyllithium (26.0 mL, 2.50 M in hexane) was added slowly. After 30 minutes, dry ice (3.0 g) was added to the reaction. After 1 hour, the reaction was allowed to warm to room temperature, then poured into water and extracted with ethyl acetate. The aqueous layer was acidified with 1 N HCl to pH=4-5 and extracted with ethyl acetate. The organic layer was dried over anyhydrous sodium sulfate, filtered and concentrated to give the crude compound as a light yellow solid (59, 5.6 g, 57.0%).

Provenance & Evidence