Potassium Hydroxide → 4-(2-carboxyethyl)-3-methyl-5-(5-bromo-2-oxo-1,2-dihydro-indol-3-ylidenemethyl)-1H-pyrrole-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of 5-formyl-4-(2-ethoxycarbonylethyl)-3-methyl-1H-pyrrole-2-carboxylic acid ethyl ester (281 mg), 5-bromo-2-oxindole (220 mg), and piperidine (2 drops) in ethanol (2 mL) was stirred at 90° C. for 2 hours. Potassium hydroxide (537 mg) was added and the temperature was increased to 95° C. for 1 hour. The reaction mixture was cooled and concentrated. The residue was dissolved into water and acidified with 2 N hydrochloric acid to pH 2. The precipitate that formed was filtered, washed with water and dried in a vacuum oven overnight to give 411 mg (98%) of 4-(2-carboxyethyl)-3-methyl-5-(5-bromo-2-oxo-1,2-dihydro-indol-3-ylidenemethyl)-1H-pyrrole-2-carboxylic acid.

Provenance & Evidence