A simple and efficient one-pot synthetic approach was used for
the preparation of biologically interesting spirooxindole derivatives
by means of three-component reactions of isatins, malononitrile,
and 1,3-dicarbonyl compounds catalyzed by ethylenediamine diacetate
(EDDA) in an aqueous medium. This method is of great value because
of its environmentally benign character, high yield, and easy handling.
spiro compounds - indoles - catalysis - Brønsted
acids - Brønsted bases - water