At room temperature, 3-(4,4,5, 5-tetramethyl-1, 3, 2-dioxane heterocyclopentan-2-methyl) benzoic acid (100mg,0.76mmol) was added to the THF(30mL) suspension of LiAlH4(100mg,2.63mmol) in batches. The reaction mixture was stirred at room temperature for another 3 hours. H2O(3mL) was added dropwise at 0°C, then the mixture was filtered and concentrated under reduced pressure to obtain crude (3-(4,4,5, 5-tetramethyl -1,3, 2-dioxoborane-2-yl) phenyl) methanol (3-hydroxymethylphenylborate pinacyl ester, 190mg).