[Br:1][C:2]1[CH:9]=[CH:8][C:7]([O:10][CH3:11])=[CH:6][C:3]=1[CH2:4][OH:5].N1C=CN=C1.[Si:17](Cl)([C:20]([CH3:23])([CH3:22])[CH3:21])([CH3:19])[CH3:18].CCOCC>C1COCC1.O.CCCCCC>[Br:1][C:2]1[CH:9]=[CH:8][C:7]([O:10][CH3:11])=[CH:6][C:3]=1[CH2:4][O:5][Si:17]([C:20]([CH3:23])([CH3:22])[CH3:21])([CH3:19])[CH3:18]
Under a nitrogen atmosphere, 23.0 g (0.11 mol) of 2-bromo-5-methoxybenzyl alcohol (13) was dissolved in 100 mL of anhydrous THF. 14.43 g (0.21 mol) of imidazole was added, followed by 17.6 g (0.12 mol) of t-butyl dimethylsilylchloride. The reaction mixture was allowed to stir overnight at ambient temperature. Ether was added and the reaction was diluted with water (200 mL). The aqueous layer was separated and extracted with ether (2×300 mL). The combined organic extracts were dried over sodium sulfate, filtered and concentrated in vacuo to afford crude product. The crude product was loaded onto a 4 inch×6 inch silica gel column. Using 40% ether in hexane as an eluant afforded 33.63 g (96%) of (2-bromo-5-methoxy-benzyloxy)-tert-butyl-dimethyl-silane (14).
Wird geladen…
