[CH3:1][C:2]([Si:5](Cl)([CH3:7])[CH3:6])([CH3:4])[CH3:3].CCN(CC)CC.[Br:16][C:17]1[CH:18]=[C:19]([CH2:23][OH:24])[CH:20]=[CH:21][CH:22]=1.Cl>CN(C1C=CN=CC=1)C.C(Cl)Cl>[Br:16][C:17]1[CH:18]=[C:19]([CH2:23][O:24][Si:5]([C:2]([CH3:4])([CH3:3])[CH3:1])([CH3:7])[CH3:6])[CH:20]=[CH:21][CH:22]=1TBSCl (18.7 g, 124.3 mmol), Et3N (14.08 g, 139.2 mmol) and DMAP (194.3 mg, 8.9 mmol) were dissolved in CH2Cl2 (120 mL), then the solution was cooled to 0-5° C. (3-bromophenyl)methanol (18.5 g, 99.4 mmol) was added dropwise to the solution. After the addition, the mixture was warmed to room temperature, and stirred for 2 h. 5% HCl was added to the reaction mixture to pH=4-5, then the organic phase was separated, and the aqueous layer was extracted with CH2Cl2 (50 mL×2). The combined organic phase was washed with water, and dried over Na2SO4. After removing the solvent, 28.5 g of {[(3-Bromophenyl)methyl]oxy}(1,1-dimethylethyl)dimethylsilane was obtained (Yield: 95.1%).
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