[CH3:1][O:2][C:3]1[CH:7]=[C:6]([CH3:8])[O:5][N:4]=1.[I:9]N1C(=O)CCC1=O>CC(O)=O>[I:9][C:7]1[C:3]([O:2][CH3:1])=[N:4][O:5][C:6]=1[CH3:8]To a solution of 3-Methoxy-5-methyl-isoxazole (0.60 g, 5.0 mmol) in AcOH (15 mL) is added N-iodosuccinimide (1.10 g, 5.00 mmol) at 60° C. under nitrogen. Then the reaction mixture is stirred at 60° C. for 2 h. The mixture is concentrated in vacuo to give an oil. This oil is purified by column chromatography on silica gel to give the desired compound.
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