[F:1][C:2]1C=CC=CC=1[C@]12COC[C@H]1CSC(NC(=O)C1C=CC=CC=1)=N2.C(=O)([O-])[O-].[Cs+].[Cs+].[OH:32][C:33]1[N:34]=[CH:35][C:36]([C:39]([O:41][CH3:42])=[O:40])=[N:37][CH:38]=1.O>CN(C)C=O>[F:1][CH2:2][O:32][C:33]1[N:34]=[CH:35][C:36]([C:39]([O:41][CH3:42])=[O:40])=[N:37][CH:38]=1Fluoromethyl toluene-4-sulfonate (Journal of Labelled Compounds & Radiopharmaceuticals, 46 (6), 555-566; 2003) (344 mg) and cesium carbonate (824 mg) were added to a solution of methyl 5-hydroxypyrazine-2-carboxylate (130 mg) in N,N-dimethylformamide (2.0 mL). The reaction solution was stirred at 70° C. for five hours and 30 minutes and then cooled to room temperature. Water was added to the reaction solution, followed by extraction with ethyl acetate. The organic layer was concentrated under reduced pressure. The residue was purified by NH-silica gel column chromatography to obtain the title compound (18.0 mg).
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