ZnS-nanoparticles, as recyclable heterogeneous catalyst, efficiently promoted in the synthesis of
spiro[pyrrolidine-2,3'-oxindole] derivatives through three-component reaction of isatin, α-amino acid and phenothiazinyl
chalcones. An azomethine ylide generated by decarboxylative condensation of isatin with α-amino acid, and chalcones
have been used as trapping dipolarophiles. ZnS nanoparticles were synthesized by aqueous chemical method. The advantages
of this method lie in its simplicity, cost effectiveness, and easier scaling up for large scale synthesis.
Keywords: ZnS-nanoparticles, chalcones, azomethine ylide, multicomponent reaction, spiro-heterocycles.
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