Piperidine → 3-{3-[4-(2-Carboxy-ethyl)-3-methyl-1H-pyrrol-2-ylmethylene]-2-oxo-2,3-dihydro-1H-indol-5-yl}-propionic acid

Participants

Reaction Steps

4-(2-Carboxyethyl)-2-formyl-3-methylpyrrole (90.6 mg), 102.6 mg 5-carboxyethyl-2-oxindole and 75 μL piperidine in 2 mL of ethanol were heated at 95° C. for 5 hours. 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. The crude solid was purified by chromatography a silica gel column eluting with ethyl acetate-hexane-acetic acid to give 121 mg (66%) of the title compound as a yellow solid.

Provenance & Evidence