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PPh 3 Mediated Reductive Annulation Reaction between Isatins and Electron Deficient Dienes to Construct Spirooxindole Compounds.

Lei Zhang, Hong Lu, Guo-Qiang Xu, Zhu-Yin Wang, Peng-Fei Xu
Journal of Organic Chemistry 2017 June 3
A PPh3 mediated reductive annulation reaction between isatins and 4,4-dicyano-2-methylenebut-3-enoates was developed. The reaction provided an alternative method for constructing five- and three-membered all-carbon spirooxindole compounds. Lithium chloride as a Lewis acid played a key role in the synthesis of spirocyclopentenyl oxindole compounds.

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