[CH3:1][Si:2]([CH3:15])([CH3:14])[CH2:3][CH2:4][O:5][CH2:6][O:7][C:8]1[CH:9]=[N:10][CH:11]=[CH:12][CH:13]=1.CCCCC.C([Li])(C)(C)C.CN(C)[CH:28]=[O:29].[Cl-].[NH4+]>O1CCCC1>[CH:28]([C:13]1[CH:12]=[CH:11][N:10]=[CH:9][C:8]=1[O:7][CH2:6][O:5][CH2:4][CH2:3][Si:2]([CH3:15])([CH3:14])[CH3:1])=[O:29]To a solution of 3-[2-(trimethylsilyl)ethoxymethoxy]pyridine (39.3 g, 0.174 mol) in tetrahydrofuran (250 ml), a 1.47 mol/L t-butyllithium n-pentane solution (154 ml, 0.227 mol) was added dropwise at −70° C. over 40 minutes. After stirring at −70° C. for 1 hour, N,N-dimethylformamide (40 mL, 0.522 mol) was added over 30 minutes and stirred at −70° C. for 1.5 hours. After warming to −20° C., saturated aqueous ammonium chloride was added to the reaction mixture, which was then extracted twice with ethyl acetate. The organic layers were dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (hexane:ethyl acetate=80:20) to give 4-formyl-3-[2-(trimethylsilyl)ethoxymethoxy]pyridine (24.5 g, 58%) as a brown oil.
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