3-(5-formyl-2,4-dimethyl-1H-pyrrol-3-yl)propanoic Acid → 3-(5-[6-(3-Ethoxy-phenyl)-2-oxo-1,2-dihydroindol-3-ylidenemethyl]-2,4-dimethyl-1H-pyrrol-3-yl)-propionic acid

Participants

Reaction Steps

3-(2-carboxyethyl)-2,4-dimethyl-5-formylpyrrole (97.6 mg), 127 mg 6-(3-ethoxyphenyl)-2-oxindole, and 2 drops piperidine in 2 mL ethanol were heated at 90° C. overnight. The reaction mixture was cooled and concentrated. The residue was suspended in 6 N aqueous hydrochloric acid. The precipitate was filtered, washed with water to pH 6 and dried in a vacuum oven overnight to give 227 mg of the title compound (˜100%) as a brown solid.

Provenance & Evidence