[F:1][C:2]1[C:10]2[O:9][N:8]=[C:7]([CH3:11])[C:6]=2[CH:5]=[C:4]([C:12]([O:14][CH3:15])=[O:13])[C:3]=1[NH:16][C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=1[F:23].[I:24]N1C(=O)CCC1=O.C(O)(C(F)(F)F)=O>CN(C=O)C>[F:1][C:2]1[C:10]2[O:9][N:8]=[C:7]([CH3:11])[C:6]=2[CH:5]=[C:4]([C:12]([O:14][CH3:15])=[O:13])[C:3]=1[NH:16][C:17]1[CH:22]=[CH:21][C:20]([I:24])=[CH:19][C:18]=1[F:23]To a suspension of methyl 7-fluoro-6-(2-fluorophenylamino)-3-methylbenzo[d]isoxazole-5-carboxylate (2.84 g, 8.93 mmol) in DMF (50 ml) were added N-iodosuccinimide (3.01 g, 13.4 mmol) and TFA (3 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 3.77 g (95%) of methyl 7-fluoro-6-(2-fluoro-4-iodophenylamino)-3-methylbenzo[d]isoxazole-5-carboxylate as a tan solid.
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