[NH2:1][C:2]1[N:3]=[N:4][C:5]([SH:8])=[CH:6][CH:7]=1.Cl.Cl[CH2:11][C:12]1[N:16]([CH2:17][CH2:18][CH3:19])[CH:15]=[N:14][N:13]=1.C(=O)([O-])[O-].[K+].[K+]>CN(C)C=O>[NH2:1][C:2]1[N:3]=[N:4][C:5]([S:8][CH2:11][C:12]2[N:16]([CH2:17][CH2:18][CH3:19])[CH2:15][NH:14][N:13]=2)=[CH:6][CH:7]=13-amino-6-mercaptopyridazine (0.5 g), 3-chloromethyl-4-propyl-4H-1,2,4-triazole hydrochloride (0.57 g) and potassium carbonate (0.8 g) were added to N,N-dimethylformamide (5 ml), and the mixture was stirred for 4.5 hours at room temperature. The solvent was distilled off, and to the residue was added water, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated brine, and dried over anhydrous magnesium sulfate, and then, the solvent was distilled off. The residue was purified by basic silica gel column chromatography (elution solvent: methanol/ethyl acetate), to give 3-amino-6-[(4-propyl-1H-1,2,4-triazol-3-yl)methylthio]pyridazine (0.62 g) as colorless crystals.
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