[Br:1][C:2]1[C:3]([Cl:11])=[C:4]2[N:10]=[CH:9][NH:8][C:5]2=[N:6][CH:7]=1.[H-].[Na+].Cl[CH2:15][O:16][CH2:17][CH2:18][Si:19]([CH3:22])([CH3:21])[CH3:20].[Cl-].[Na+]>CN(C)C=O>[Br:1][C:2]1[C:3]([Cl:11])=[C:4]2[N:10]=[CH:9][N:8]([CH2:15][O:16][CH2:17][CH2:18][Si:19]([CH3:22])([CH3:21])[CH3:20])[C:5]2=[N:6][CH:7]=1
6-Bromo-7-chloro-3H-imidazo[4,5-b]pyridine (1.07 g, 4.60 mmol) in N,N-dimethylformamide (12 mL) was cooled to 0° C., mixed with sodium hydride (55 wt % dispersion in mineral oil, 300 mg, 6.88 mmol) and [2-(chloromethoxy)ethyl]trimethylsilane (12.0 mL, 6.78 mmol) and stirred at room temperature for 3 hours. After addition of saturated aqueous sodium chloride, the reaction mixture was extracted with ethyl acetate, and the organic layer was dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate=10/1→5/1 (v/v)) to give the title compound as a yellow oil (640 mg, yield 38%).
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