Methyl 3,5-dibromo-4-{(1Z)-3-[(2,6-dichlorophenyl)amino]-3-oxoprop-1-enyl}benzoate → Methyl 5-bromo-1-(2,6-dichlorophenyl)-2-oxo-1,2-dihydroquinoline-7-carboxylate

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Methyl 3,5-dibromo-4-{(1Z)-3-[(2,6-dichlorophenyl)amino]-3-oxoprop-1-enyl}benzoate (1.25 g)(contaminated with 20% of the E isomer) was dissolved in dimethylformamide(36 mL) and the solution degassed with argon. Copper (I) iodide (340 mg) and dry potassium carbonate (468 mg) were added and the mixture heated to 80° C. for 30 min. The reaction mixture was poured into 5% ammonium hydroxide solution and extracted into ethyl acetate, dried over MgSO4 and concentrated. The residue was purified by silica gel chromatography eluting with 80% hexane: 20% ethyl acetate to give the title compound.

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