Cl[CH2:2][CH2:3][C:4]1[N:8]2[CH:9]=[CH:10][N:11]=[CH:12][C:7]2=[CH:6][N:5]=1.[C:13]([O-:16])(=[S:15])[CH3:14].[K+].O>CN(C=O)C>[C:13]([S:15][CH2:2][CH2:3][C:4]1[N:8]2[CH:9]=[CH:10][N:11]=[CH:12][C:7]2=[CH:6][N:5]=1)(=[O:16])[CH3:14]To a solution of 3-(2-chloroethyl)imidazo[1,5-a]pyrazine (1.51 g) in DMF (10 ml) was added potassium thioacetate (1.23 g). The mixture was stirred for 4 hours at room temperature. To the reaction mixture was added water. The mixture was subjected to extraction with ethyl acetate (50 ml×4). The organic layer was dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure. The residue was subjected to column chromatography (carrier: silica gel, 60 g, developing solvent: ethyl acetate) to give the title compound (1.65 g) as colorless solid product.
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