3,4-Dimethylphenol → 6,7-Dimethoxy-4-(3,4-dimethylphenoxy)quinoline

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4-Chloro-6,7-dimethoxyquinoline (200 mg) and 3,4-dimethylphenol (274 mg) were suspended in diethylene glycol dimethyl ether (0.1 ml), and the suspension was stirred at 180° C. for 1.5 hr. The reaction solution was cooled to room temperature, an aqueous sodium hydroxide solution was added to the reaction solution, and the mixture was extracted with chloroform. The chloroform layer was then washed with saturated brine and was dried over anhydrous sodium sulfate. The solvent was removed therefrom by distillation under the reduced pressure, and the residue was purified by column chromatography on silica gel using acetone-chloroform to give 6,7-dimethoxy-4-(3,4-dimethylphenoxy)quinoline (160 mg, yield 58%).

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