[Si:1]([O:8][C:9]1[CH:16]=[CH:15][C:12]([CH:13]=[O:14])=[CH:11][C:10]=1[O:17][CH2:18][CH3:19])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[BH4-].[Na+].C([O-])(O)=O.[Na+]>CCO>[Si:1]([O:8][C:9]1[CH:16]=[CH:15][C:12]([CH2:13][OH:14])=[CH:11][C:10]=1[O:17][CH2:18][CH3:19])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]To a solution of 4-(tert-butyldimethylsilyloxy)-3-ethoxybenzaldehyde (12.7 g, 45.4 mmol, 1.0 equiv.) in EtOH (50 mL), NaBH4 (868 mg, 22.7 mmol, 0.5 equiv.) was added at 0° C., and the mixture was stirred at 0° C. for 2 h. After slow addition of sat. aq. NaHCO3-solution, the aqueous layer was extracted with EtOAc (2×). The combined organic phases were washed with brine, dried (MgSO4), filtered and the filtrate was concentrated to yield 12.6 g (98%) of (4-(tert-butyldimethylsilyloxy)-3-ethoxyphenyl)methanol as a light yellow oil.
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