C[Si](C)(C)[O-].[K+].[F:7][CH2:8][O:9][C:10]1[N:11]=[CH:12][C:13]([C:16]([O:18]C)=[O:17])=[N:14][CH:15]=1.O.C(OCC)(=O)C>O1CCCC1>[F:7][CH2:8][O:9][C:10]1[N:11]=[CH:12][C:13]([C:16]([OH:18])=[O:17])=[N:14][CH:15]=1Potassium trimethylsilanolate (18.6 mg) was added to a solution of methyl 5-fluoromethoxypyrazine-2-carboxylate obtained in Preparation Example 15-(1) (18.0 mg) in tetrahydrofuran (1.0 mL). The reaction solution was stirred at room temperature for one hour. Water and ethyl acetate were added to the reaction solution, and the aqueous layer was separated. The aqueous layer was made acidic with 1 M hydrochloric acid, followed by extraction with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate. The drying agent was removed by filtration and the filtrate was concentrated under reduced pressure to obtain a crude product of the title compound (10.2 mg). The compound was used for the next reaction without further purification.
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