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A simple and efficient method for the synthesis of spiro[4H-pyran-oxindole] derivatives by means of threecomponent reactions between isatins, malononitrile or ethyl cyano-acetate, and 1,3-dicarbonyl compounds in the presence of catalytic amount of magnesium perchlorate in 50% aqueous ethanol medium has been described.

An Efficient Method for Multicomponent Synthesis of Spiro[4H-pyran-oxindole] Derivatives Catalyzed by Magnesium Perchlorate