An efficient and simple synthetic approach has been developed for the preparation of biologically interesting spiro[oxindole-3,4'-(4′H-pyran)] derivatives via visible light-mediated one-pot, three-component reaction of isatins, 1,3-dicarbonylcompounds and malononitrile by using an inexpensive organic dye, Na2 eosin Y, as the photocatalyst in aqueous ethyl lactate at ambient temperature. The substrate
Abstract New three-component reaction was developed via one-pot strategy for the synthesis of functionalized 3,3′-disubstituted oxindoles and spirooxindole through the reaction among isatin, malononitrile, and acetone/indole/nitromethane/acetylacetone/dimedone in ethanol as solvent without base. It was observed that all the mixed ligand transition metal complexes with triphenylphosphine worked as the