Imidazole → Ethyl 2-[2-(1-imidazolyl)ethyl]-6,7-dimethoxy-4-(3,4-dimethoxyphenyl)quinoline-3-carboxylate

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Reaction Steps

Oily sodium hydride (60%, 0.044 g) was added to a solution of imidazole (0.075 g) in N,N-dimethylformamide (5 ml), and the mixture was stirred at room temperature for 15 minutes. Then ethyl 2-(2-bromoethyl)-6,7-dimethoxy-4-(3,4-dimethoxyphenyl)quinoline-3-carboxylate (0.46 g) was added. The mixture was stirred at 80° C. for 1 hour, poured into water and extracted with ethyl acetate. The ethyl acetate layer was washed with water and dried over magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue was subjected to column chromatography on silica gel. The fractions eluted with ethyl acetate/methanol (10/1, v/v) gave ethyl 2-[2-(1-imidazolyl)ethyl]-6,7-dimethoxy-4-(3,4-dimethoxyphenyl)quinoline-3-carboxylate (0.295 g, 66%) which was then recrystallized from ethyl acetate-hexane. Colorless prisms. mp. 173°-174° C.

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