Trifluoroacetic acid → 7-fluoro-6-(2-fluoro-4-iodophenylamino)-2,3-dimethyl-2H-indazole-5-carboxylic acid methyl ester

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Reaction Steps

To a solution of 7-fluoro-6-(2-fluoro-phenylamino)-2,3-dimethyl-2H-indazole-5-carboxylic acid methyl ester (141 mg, 0.43 mmol) in DMF (5 ml) were added NIS (144 mg, 0.64 mmol) and TFA (0.20 mL), and the reaction was stirred at room temp for 4 h. The crude was diluted with EtOAc and washed with H2O. The organic fraction is dried over MgSO4 and concentrated under reduced pressure. Silica gel chromatography (EtOAc:Hexanes=75:25) yielded 137 mg (70%) of the title compound as a yellow solid.

Provenance & Evidence