[OH-].[Na+].C([O:5][C:6](=[O:27])[CH2:7][O:8][C:9]1[CH:14]=[CH:13][C:12]([B:15]2[O:19]C(C)(C)C(C)(C)[O:16]2)=[CH:11][C:10]=1[O:24][CH2:25][CH3:26])C.O.C(OCC)(=O)C>C(O)C>[C:6]([CH2:7][O:8][C:9]1[CH:14]=[CH:13][C:12]([B:15]([OH:19])[OH:16])=[CH:11][C:10]=1[O:24][CH2:25][CH3:26])([OH:27])=[O:5]A 2 mol/L aqueous solution of sodium hydroxide (2.14 mL) was added to a solution of ethyl[2-ethoxy-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenoxy]acetate (0.15 g) in ethanol (10 mL), and the resulting mixture was stirred at 60° C. for 3 hrs. Water and ethyl acetate were added to the reaction mixture. The aqueous layer was separated, washed with ethyl acetate, made acidic with the addition of 2 mol/L hydrochloric acid, and extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure to afford the title compound (0.066 g).
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