Azobisisobutyronitrile → Ethyl 2-bromomethyl-4-(3,4-dimethoxyphenyl)-6,7-dimethoxyquinoline-3-carboxylate

Participants

Reaction Steps

A mixture of 6,7-dimethoxy-4-(3,4-dimethoxyphenyl)-2-methylquinoline-3-carboxylic acid ethyl ester (411 rag), N-bromosuccinimide (214 mg), 2,2'-azobis(isobutyronitrile) (10 mg) and carbon tetrachloride (10 ml) was stirred under refluxing conditions for 5 hours. The reaction mixture was washed with water and dried (MgSO4), after which the solvent was distilled off under reduced pressure. The residue was subjected to silica gel column chromatography and eluted with chloroform-ethyl acetate (10:1, v/v) to yield 2-bromomethyl-6,7-dimethoxy-4-(3,4-dimethoxyphenyl)quinoline-3-carboxylic acid ethyl ester (285 mg, 58%), which was then recrystallized from ethyl acetate-hexane to yield a colorless prismatic crystal having a melting point of 135° to 136° C.

Provenance & Evidence