Three-component synthesis of novel spirooxindole–furan derivatives using pyridinium salts

A simple and efficient synthesis of novel spirooxindole–furan derivatives has been investigated by a modified version of the“interrupted” Feist–Bénary (IFB) reaction of isatin derivatives, 1,3-dicarbonyl compounds and N -phenacyl pyridinium salts in the presence of triethylamine. The reaction has been carried out under mild conditions in ethanol, and the products were obtained in good to moderate yields with a simple work-up procedure.