[Br:1][C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[CH:4][C:3]=1[CH:9]([CH3:11])[CH3:10].Cl[Si:13]([C:16]([CH3:19])([CH3:18])[CH3:17])([CH3:15])[CH3:14].N1C=CN=C1>CN(C=O)C.O>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([O:8][Si:13]([C:16]([CH3:19])([CH3:18])[CH3:17])([CH3:15])[CH3:14])=[CH:4][C:3]=1[CH:9]([CH3:11])[CH3:10]A solution of 4-bromo-3-isopropyl-phenol (Intermediate 144, 1.13 g, 5.25 mmols), chloro-tert-butyl-dimethylsilane (0.95 g, 6.30 mmols), and imidazole (428.0 mg, 6.3 mmols) in 10 mL DMF was stirred at 25° C. for 3 hours. The solution was diluted with H2O and extracted with Et2O and the combined organic layers were washed with H2O, saturated aqueous NaCl, and dried (MgSO4) before being concentrated under reduced pressure. Column chromatography (1-2% EtOAc-hexanes) afforded 1.50 g (87%) of the title compound as a colorless oil.
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