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. 2016 Aug 30;6:32213. doi: 10.1038/srep32213

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Synthesis of a library of spiro[pyrrolidine-3, 3´-oxindole] compounds 5b–o via one pot Pictet Spengler-oxidative ring contraction of tryptamine at room temperature with variety of aromatic aldehydes were executed.