2-Fluoro-4-iodoaniline → 3,4-Difluoro-2-(2-fluoro-4-iodophenylamino)-5-nitrobenzoic acid

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-fluoro-4-iodoaniline (2.9 g, 11.8 mmoles) in 50 ml anhydrous THF at −60° C., 40 ml of a 1M solution of LHMDS in THF (40 mmoles) is added dropwise. In a separate flask, 2,3,4-trifluoro-5-nitrobenzoic acid (5 g, 22.6 mmoles), previously dissolved in THF (50 ml), is treated, at −60° C., with 25 ml of a 1M solution of LHMDS in THF (25 mmoles). Both solutions are stirred at −78° C. for 45 min and the second solution is transferred via cannula to the first reaction mixture. After completion of the addition the resulting mixture is stirred under argon at room temperature for 15 hours. The reaction mixture is quenched with water, then 1N HCl is added (pH=0-1) followed by brine (100 ml). The crude material is extracted with THF (3×100 ml), the organic layers are combined and dried (Na2SO4) and the solvent is removed to give the title compound.

Provenance & Evidence