5-Chlorooxindole → 4-(2-ethoxycarbonylethyl)-3-methyl-5-(5-chloro-2-oxo-1,2-dihydro-indol-3-ylidenemethyl)-1H-pyrrole-2-carboxylic acid ethyl ester

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Reaction Steps

5-Formyl-4-(2-ethoxycarbonylethyl)-3-methyl-1H-pyrrole-2-carboxylic acid ethyl ester (281 mg), 5-chloro-2-oxindole (168 mg), and piperidine (2 drops) in ethanol (2 mL) were refluxed for 2 hours. The reaction mixture was cooled and the precipitate that formed was filtered, washed with ethanol and hexanes, and dried to give 369 mg (86%) of 4-(2-ethoxycarbonylethyl)-3-methyl-5-(5-chloro-2-oxo-1,2-dihydro-indol-3-ylidenemethyl)-1H-pyrrole-2-carboxylic acid ethyl ester as a light yellow needle crystals.

Provenance & Evidence