Dimethyl Sulfate → Methyl 3,4-difluoro-2-((2-fluoro-4-iodophenyl)amino)-5-nitrobenzoate

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Reaction Steps

To a solution of 3,4-difluoro-2-(2-fluoro-4-iodo-phenylamino)-5-nitro-benzoic acid (595.3 g, 1.363 mol) in acetone (9 L) was added sodium bicarbonate (609.0 g, 3.48 mol) and the mixture was stirred for 10 min. To this suspension was added dimethylsulfate (285.6 ml, 3.026 mol) and refluxed for 3 h (completion of reaction was confirmed by TLC-hexane: EtOAc/4:1), cooled to room temperature and evaporated under vacuum. The residue (yellow) was further digested in hot methanol (2 L), filtered, washed with methanol and dried to give the title compound as a solid (yellow). Yield: 405.63g (65.54%).

Provenance & Evidence