Triethylamine → 4-{5-[(E)-2-Ethoxycarbonylvinyl]-3-cyanoindol-1-yl}benzoic acid

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Reaction Steps

A solution of 4-(5-bromo-3-cyanoindol-1-yl)benzoic acid ethyl ester (0.1 g), acrylic acid ethyl ester (0.11 g) and triethylamine (0.082 g) in N,N-dimethylformamide (2 mL) was stirred in the presence of palladium (II) acetate (0.0061 g) and triphenylphosphine (0.014 g) at 100° C. for 30 hours. This reaction mixture was poured into water, and this resulting mixture was extracted with ethyl acetate twice. This organic layer was washed with brine, and dried over anhydrous magnesium sulfate. The solvent was concentrated under reduced pressure. The residue was purified by column chromatography on silica gel, (eluent: ethyl acetate/n-hexane=10/90-75/25) to give the title compound (0.035 g).

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