Unexpected regio- and stereoselective [4 + 3] cycloaddition reaction of azomethine ylides with benzylidene thiazolidinediones: synthesis of pharmacologically active spiroindoline oxazepine derivatives and theoretical study


An unexpected regio- and stereoselective [4 + 3] cycloaddition reaction of azomethine ylides with 5-benzylidenethiazolidine-2,4-diones has been successfully developed for the synthesis of the novel pharmacologically active 4′,5′-dihydro-3′H-spiro[indoline-3,2′-[1, 3] oxazepin]-2-one derivatives in basic condition. Easy purification, high yield, short experimental time and operational simplicity are specific advantages of this protocol. Furthermore, all the synthesized compounds have been evaluated for antioxidant and antibacterial activities. According to the results, most of the synthesized compounds exhibited DPPH radical scavenging activity and nine of them showed antibacterial properties. The reaction mechanism and 1H NMR spectrum have been evaluated by B3LYP/6311G method.

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The authors express appreciation to the University of Jiroft Faculty Research Committee and Jiroft University of Medical Science for supporting this investigation.

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Zahedifar, M., Pouramiri, B., Ezzati Ghadi, F. et al. Unexpected regio- and stereoselective [4 + 3] cycloaddition reaction of azomethine ylides with benzylidene thiazolidinediones: synthesis of pharmacologically active spiroindoline oxazepine derivatives and theoretical study. Mol Divers 25, 29–43 (2021). https://doi.org/10.1007/s11030-019-10022-z

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  • Regioselectivity
  • Spiroindoline oxazepine
  • [4 + 3] Cycloaddition reaction
  • Pharmacologically active
  • Theoretical NMR analysis