[CH3:1][O:2][C:3]1[CH:12]=[C:11]([B:13]2[O:17]C(C)(C)C(C)(C)[O:14]2)[CH:10]=[CH:9][C:4]=1[C:5]([O:7][CH3:8])=[O:6].C([O-])(=O)C.[NH4+].I([O-])(=O)(=O)=O.[Na+]>CC(C)=O.O>[CH3:1][O:2][C:3]1[CH:12]=[C:11]([B:13]([OH:14])[OH:17])[CH:10]=[CH:9][C:4]=1[C:5]([O:7][CH3:8])=[O:6]To a suspension of methyl 2-methoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzoate (2.0 g) in acetone (70 ml) and water (70 ml) was added ammonium acetate (1.11 g) and sodium periodate (3.08 g), and the mixture was stirred at room temperature for 15 hours. The solvent was evaporated and the residue was diluted with ethyl acetate. The organic layer was separated, washed with water and brine, dried over magnesium sulfate and evaporated under reduced pressure to give [3-methoxy-4-(methoxycarbonyl)phenyl]-boronic acid (1.4 g).
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