2-Fluoro-4-iodoaniline → 6-Fluoro-2-[(2-fluoro-4-iodophenyl)amino]nicotinic acid

Participants

Reaction Steps

To solution of 2-fluoro-4-iodoaniline (0.82 g, 3.46 mmol) in THF (10 mL) at −78° C. LiHMDS (6.00 mL, 6.60 mmol) was added. After stirring for 15 min, 2,6-difluoronicotinic acid (0.50 g, 3.14 mmol) was added to the mixture. The mixture was allowed to warm to room temperature until completion. The mixture was washed with NaOH (1 N) and extracted with ether. The aqueous layer was acidified with concentrated HCl and back-extracted with ethyl acetate. The organic layer was concentrated to afford product. Second crop of product was obtained by purifying the THF/ether layer with silica gel chromatography. LC/MS [Method B: rt. 9.09 min, m/z 377 (M+1)].

Provenance & Evidence