Imidazole → 2-Bromo-5-(2-iodoethyl)pyridine
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[Br:1][C:2]1[N:7]=[CH:6][C:5]([CH2:8][CH2:9]O)=[CH:4][CH:3]=1.N1C=CN=C1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[I:35]I>ClCCl>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([CH2:8][CH2:9][I:35])=[CH:6][N:7]=1[Br:1][C:2]1[N:7]=[CH:6][C:5]([CH2:8][CH2:9]O)=[CH:4][CH:3]=1.N1C=CN=C1.C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[I:35]I>ClCCl>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([CH2:8][CH2:9][I:35])=[CH:6][N:7]=1A solution of 2-(6-bromopyridin-3-yl)ethanol (2.0 g, 9.9 mmol, 1.0 equiv) in dichloromethane (31 mL) was added dropwise to a solution of imidazole (0.91 g, 13.4 mmol, 1.4 equiv), triphenylphosphine (3.3 g, 12.4 mmol, 1.3 equiv), and iodine (3.1 g, 12.4 mmol, 1.3 equiv) in dichloromethane (31 mL) at room temperature. After stirring for 6 h, the reaction was filtered and concentrated under reduced pressure. The crude material was purified by flash chromatography on silica gel (15% ethyl acetate in heptane) to provide the title compound as a white solid (2.83 g, 92%). MS (LCMS) m/z 312.0 (M+1). 1H NMR (400 MHz, METHANOL-d4) δ ppm 3.15 (t, J=7.03 Hz, 2H) 3.43 (t, J=7.03 Hz, 2H) 7.54 (d, J=7.81 Hz, 1H) 7.61 (dd, J=8.20, 2.73 Hz, 1H) 8.22 (d, J=2.34 Hz, 1H).
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