[I:1][C:2]1[CH:3]=[C:4]([OH:9])[CH:5]=[CH:6][C:7]=1[CH3:8].[C:10]([Si:14]([CH3:17])([CH3:16])Cl)([CH3:13])([CH3:12])[CH3:11].N1C=CN=C1>CN(C=O)C.C(OCC)C>[Si:14]([O:9][C:4]1[CH:5]=[CH:6][C:7]([CH3:8])=[C:2]([I:1])[CH:3]=1)([C:10]([CH3:13])([CH3:12])[CH3:11])([CH3:17])[CH3:16]A mixture of 3-iodo-4-methylphenol 1-1 (500 mg, 2.14 mmol), tert-butyldimethylchlorosilane (387 mg, 2.57 mmol) and imidazole (175 mg, 2.57 mmol) in 11 mL of DMF was stirred at rt for 16 h, and then diluted with diethylether, washed with water, brine, dried (MgSO4) and evaporated. The residue was subjected to MPLC on a 40 g column of SiO2 eluting with hexanes to provide 5-tert-butyldimethylsilyloxy-2-methylphenyliodide 1-2 as an oil. 1H NMR (300 MHz, DMSO-d6): δ 0.17 (s, 6H), 0.93 (s, 9H), 2.29 (s, 3H), 6.81 (dd, 1H, J=8, 2 Hz), 7.20 (d, 1H, J=8 Hz), 7.28 (d, 1H, J=2 Hz).
読み込み中…
