Cl.Cl.[NH2:3][CH2:4][CH2:5][CH2:6][S:7][C:8]1[CH:13]=[CH:12][N:11]=[CH:10][CH:9]=1.C(N(CC)CC)C.[N:21]1[C:30]2[C:25](=[CH:26][CH:27]=[CH:28][CH:29]=2)[N:24]=[CH:23][C:22]=1[C:31](Cl)=[O:32]>C(Cl)Cl>[N:21]1[C:30]2[C:25](=[CH:26][CH:27]=[CH:28][CH:29]=2)[N:24]=[CH:23][C:22]=1[C:31]([NH:3][CH2:4][CH2:5][CH2:6][S:7][C:8]1[CH:13]=[CH:12][N:11]=[CH:10][CH:9]=1)=[O:32]To a solution of 4.30 g (17.8 mmol) of 4-(3-aminopropylthio)pyridine dihydrochloride and 8.68 ml (62.3 mmol) of triethylamine in 200 ml of methylene chloride, 3.43 g (17.8 mmol) of 2-quinoxaloyl chloride was added with stirring under ice-cooling, and the mixture was stirred at room temperature for 4 hours. The reaction mixture was washed with saturated aqueous sodium bicarbonate and water, and dried. The solvent was distilled off and the residue was purified by column chromatography (eluent: ethyl acetate) and recrystallization (solvent: ethyl acetate-ether) to give 2.82 g of the desired compound (48.9% yield, white crystals).
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