The compound (3-bromo-4-(6-cyano-2-naphthyloxy)nitrobenzene) (1 g) obtained in a previous production example, 2-formylphenyl boronic acid (610 mg) and tetrakis(triphenylphosphine)palladium (0) (150 mg) were heated to reflux and reacted for 6 hours in a mixture of 2 M sodium carbonate aqueous solution (10 ml), toluene (10 ml) and ethanol (10 ml). After cooling to room temperature, water was added and extraction was performed with ethyl acetate. The ethyl acetate layer was washed with saturated saline and dried over magnesium sulfate, and the solvent was distilled off. The residue was purified by silica gel chromatography (200 g, hexane:ethyl acetate=4:1) to obtain 880 mg of 4-(6-cyano-2-naphthyloxy)-3-(2-formylphenyl)nitrobenzene.
