Trifluoroacetic acid → Methyl 7-fluoro-6-(2-fluoro-4-iodophenylamino)-3-methylbenzo[c]isoxazole-5-carboxylate

Participants

Reaction Steps

To a suspension of methyl 7-fluoro-6-(2-fluorophenylamino)-3-methylbenzo[c]isoxazole-5-carboxylate (1.31 g, 4.12 mmol) in DMF (40 ml) was added N-iodosuccinimide (1.39 g, 6.17 mmol) and TFA (2.4 ml). After stirring at room temperature for 4 h, the reaction was quenched with saturated aqueous NH4Cl solution (100 ml) and extracted with EtOAc (2×100 ml). The combined organic solution was washed with brine (100 ml), dried over MgSO4 and concentrated. Silica gel chromatography (EtOAc:Hexanes=25:75) yielded 1.71 g (93%) of methyl 7-fluoro-6-(2-fluoro-4-iodophenylamino)-3-methylbenzo[c]isoxazole-5-carboxylate as a brown solid.

Provenance & Evidence