Water → Ethyl 6,7-dimethoxy-4-(3,4-dimethoxyphenyl)-2-(1,2,4-triazol-1-ylmethyl)quinoline-3-carboxylate 1-oxide

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Reaction Steps

Oily sodium hydride (60%, 0.156 g) was added to a solution of 1H-1,2,4-triazole (0.27 g) in N,N-dimethylformamide (DMF) (20 ml), followed by stirring at room temperature for 15 minutes. Then 2-chloromethyl-6,7-dimethoxy-4-(3,4-dimethoxyphenyl)quinoline-3-carboxylic acid ethyl ester 1-oxide (1.5 g) was added, followed by stirring at 80° C. for 45 minutes. The reaction mixture was poured over water and extracted with dichloromethane. The dichloromethane layer was washed with water and then dried (MgSO4), after which the solvent was distilled off. The residual oily substance was subjected to silica gel column chromatography and eluted with chloroform-methanol (30:1, v/v) to yield 6,7-dimethoxy-4-(3,4-dimethoxyphenyl)-2-(1,2,4-triazol-1-ylmethyl)quinoline-3-carboxylic acid ethyl ester 1-oxide (0.8 g, 50%), which was then recrystallized from dichloromethane-hexane to yield a colorless prismatic crystal having a melting point of 221 to 222° C.

Provenance & Evidence