2-Fluoro-4-iodoaniline → 4-(2-Fluoro-4-iodophenylamino)-1,5-dimethyl-6-oxo-1,6-dihydropyridine-3-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

To the stirred solution of 2-fluoro-4-iodoaniline (470 mg, 1.94 mmol) in dry THF (4 mL) cooled to −78° C., was added LDA (2M in THF) (1.35 mL, 2.70 mmol). After vigorous stirring for 10 minutes at this temperature, a solution of 4-chloro-1,5-dimethyl-6-oxo-1,6-dihydropyridine-3-carboxylic acid (160 mg, 0.792 mmol) dissolved in dry THF (8 mL) was added dropwise through a syringe. The dry-ice bath was removed after 1 hour, and the reaction was stirred for 16 hours at room temperature At this time, LC/MS indicated 23% of the title product and 33% of unreacted chloride in the reaction mixture. The same reaction mixture was continued to stir at room temperature for additional 24 hours. The mixture was then re-cooled to −78° C. under a dry-ice/acetone bath. Additional LDA (1.35 mL, 2.70 mmol) (2M in THF) was added to the reaction mixture and slowly warmed to room temperature in 16 hours until LC/MS showed the consumption of chloride material. The mixture was cooled to −5° C., and aqueous HCl (1N) (15 mL) was added. The solution was extracted with EtOAc (15 mL×3). The combined organic layers was dried (MgSO4) and concentrated to give a residue which was triturated with DCM to give a solid. The title compound was used for the next reaction without further purification. (165 mg, 52% yield).

Provenance & Evidence