Ammonium Chloride → 1-[4-(tert-Butyldiphenylsilyloxymethyl)-1-(2-trimethylsilylethoxymethyl)-1H-imidazol-2-yl]ethanone

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The compound obtained in (1) (30.0 g) was dissolved in tetrahydrofuran (hereinafter sometimes referred to as THF) (500 mL) and cooled to −78° C. with stirring under an argon atmosphere. n-Butyllithium (a 2.66 M hexane solution, 36.2 mL) was slowly added dropwise to this solution by using a syringe, and stirring was conducted at the same temperature for 30 minutes. N-Methoxy-N-methylacetamide (13.1 mL) was then added by using a syringe, and stirring was continued for 90 minutes. A saturated aqueous solution of ammonium chloride was added to the reaction solution to stop the reaction, and extraction was conducted by using ethyl acetate. The combined extract liquid was washed with saturated brine and dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure. The resulting residue was purified by flash chromatography (ethyl acetate/hexane=5%→30%) using a silica gel column (trade name: Hi-Flash column 5L, manufactured by Yamazen Corporation) to give the title compound (24.4 g).

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