Piperidine → 3-[2,4-Dimethyl-5-(6-morpholin-4-yl-2-oxo-1,2-dihydroindol-3-ylidenemethyl)-1H-pyrrol-3-yl]-propionic acid

Participants

Reaction Steps

3-(2-Carboxyethyl)-2,4-dimethyl-5-formylpyrrole (3.3 g), 4 g 6-(morpholin-4-yl)-2-oxindole and 1.8 mL piperidine in 60 mL of ethanol were heated at 90° C. for 7 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 resulting solid was purified by chromatography on a silica gel column eluting with ethyl acetate-hexane-acetic acid to give 2.78 g (38% yield) of the title compound as a brown solid.

Provenance & Evidence