Triethylamine → 8-fluoro-7-(2-fluoro-4-iodophenyl)-2,3-dimethyl-2,7-dihydro-5H-imidazo[4,5-f]indazol-6-one

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Reaction Steps

To a suspension of 7-fluoro-6-(2-fluoro-4-iodophenylamino)-2,3-dimethyl-2H-indazole-5-carboxylic acid (126 mg, 0.29 mmol) in toluene (10 ml) was added triethylamine (0.13 ml, 0.90 mmol) and diphenylphosphoryl azide (0.081 ml, 0.38 mmol). The reaction was heated at reflux for 4 h. The mixture was cooled to room temperature and concentrated to dryness. Silica gel chromatography (EtOAc:Hexane=75:25) yields 51 mg (39%) of the title compound as a light yellow solid.

Provenance & Evidence