[CH2:1]([C:3]1[CH:8]=[CH:7][C:6]([CH:9]([C:11]2[C:16]([O:17]COCC[Si](CC)(CC)CC)=[CH:15][CH:14]=[CH:13][N:12]=2)[OH:10])=[CH:5][CH:4]=1)[CH3:2].O.C1(C)C=CC(S(O)(=O)=O)=CC=1.C(=O)(O)[O-].[Na+]>C1COCC1.O>[CH2:1]([C:3]1[CH:4]=[CH:5][C:6]([CH:9]([C:11]2[C:16]([OH:17])=[CH:15][CH:14]=[CH:13][N:12]=2)[OH:10])=[CH:7][CH:8]=1)[CH3:2]To a solution of 4-ethylphenyl-[3-[2-(triethylsilyl)ethoxymethoxy]]pyridin-2-yl-methanol (2.35 g, 6.54 mmol) in THF-water (25:1; 60 mL), p-toluenesulfonic acid monohydrate (2.8 g, 16.4 mmol) was added and stirred at room temperature for 20 hours and at 40° C. for 4 hours. After cooling the reaction mixture to room temperature, saturated sodium bicarbonate solution (100 mL) was added and the resulting mixture was then extracted with ethyl acetate. The organic layer was washed with saturated aqueous sodium chloride and dried over anhydrous magnesium sulfate. After the solvent was distilled off under reduced pressure, the resulting residue was purified by silica gel column chromatography (hexane:ethyl acetate=2:1) to give 4-ethylphenyl-3-hydroxypyridin-2-yl-methanol (0.62 g).
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