Acetonitrile → 5-(tert-butyldiphenylsilyloxymethyl)-4-methyl-1-(2-trimethylsilylethoxymethyl)-1H-imidazole

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The mixture obtained in (1) (35.4 g) was dissolved in acetonitrile (500 mL), TEA (37.8 mL) and then 2-trimethylsilylethoxymethyl chloride (21.4 mL) were added under ice cooling and stirring, and stirring was conducted at 70° C. for 12 hours. The reaction mixture was allowed to cool to room temperature, and the solvent was distilled off under reduced pressure. The residue was diluted with ethyl acetate, washed with saturated brine and dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure, and the resulting residue was purified by flash chromatography (ethyl acetate/hexane=15%→50%) using a silica gel column (trade name: Cartridge 65i, manufactured by Biotage Ltd.) to give 4-(tert-butyldiphenylsilyloxymethyl)-5-methyl-1-(2-trimethylsilylethoxymethyl)-1H-imidazole (17.9 g) as a low polarity component and 5-(tert-butyldiphenylsilyloxymethyl)-4-methyl-1-(2-trimethylsilylethoxymethyl)-1H-imidazole (9.42 g) as a high polarity component.

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