Methyl 2-bromo-3,5-dimethoxybenzoate → 4,6,4',6'-Tetramethoxy-biphenyl-2,2'-dicarboxylic acid dimethyl ester

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Reaction Conditions

Reaction Steps

2-Bromo-3,5-dimethoxy-benzoic acid methyl ester (5.2 g) was dissolved in DMF (16 mL), and Cu powder (2.4 g) was added . After stirring at 150° C. for 3 days, the mixture was filtered and evaporated under vacuum. The crude material was subjected to silica gel chromatography using effluent of 30-60% ethyl acetate and hexanes. The fractions containing product were combined and the solvent was removed under reduced pressure to provide 4,6,4′,6′-tetramethoxy-biphenyl-2,2′-dicarboxylic acid dimethyl ester (2.5 g, 68%) as a clear oil.

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