[CH2:1]([N:5]1[CH:9]=[C:8]([C:10]2[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=2)[N:7]=[C:6]1[I:16])[CH2:2][CH2:3][CH3:4].[C:17](O)(=[O:19])C.C=O.C([O-])(=O)C.[Na+]>O>[CH2:1]([N:5]1[C:9]([CH2:17][OH:19])=[C:8]([C:10]2[CH:11]=[CH:12][CH:13]=[CH:14][CH:15]=2)[N:7]=[C:6]1[I:16])[CH2:2][CH2:3][CH3:4]To a 60 ml sealed flask is added 1-butyl-2-iodo-4-phenylimidazole (3.26 g, 10 mmol) followed by the addition of 5.5 ml of acetic acid, 16 ml of 37% formaldehyde and 7 g of sodium acetate. The resulting mixture is stirred at 115° C. for 10 h, cooled to room temperature and diluted 50 ml of water. The reaction mixture is adjusted to pH=9, extracted with ethyl acetate, washed with water and brine, dried over Na2SO4, filtered and evaporated. Purification by silica gel chromatography (hexanes/ethyl acetate, from 8:1 to 2:1) affords 3.24 of 1-butyl-5-hydroxymethyl-2-iodo-4-phenylimidazole. 1H NMR (400 MHz, CDCl3) δ 7.59 (2H, dd, J=1.6, 6.8 Hz), 7.39 (2H, m), 7.31 (1H, m), 4.78 (2H, s), 4.00 (2H, t, J=8.0 Hz), 1.78 (2H, m), 1.46 (2H, m), 1.00 (3H, t, J=7.2 Hz); MS (+VE) m/z 357(M+1).
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