[OH-].[Na+].[CH2:3]([O:5][C:6]1[CH:18]=[C:17]([B:19]2[O:23]C(C)(C)C(C)(C)[O:20]2)[CH:16]=[CH:15][C:7]=1[O:8][CH2:9][C:10]([O:12]CC)=[O:11])[CH3:4].O.C(OCC)(=O)C>C(O)C>[C:10]([CH2:9][O:8][C:7]1[CH:15]=[CH:16][C:17]([B:19]([OH:23])[OH:20])=[CH:18][C:6]=1[O:5][CH2:3][CH3:4])([OH:12])=[O:11]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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