A clean and efficient synthesis of spiro[4H-pyran-oxindole] derivatives catalyzed by egg shell
author
Abstract:
Egg shell has been utilized as a natural, green, reusable and eco-friendly reagent for the synthesis of spiro[4H-pyran-oxindole] derivatives by one-pot multicomponent reaction of isatins, 1,3-diketones, and malononitrile/ ethyl cyanoacetate. Good functional group tolerance and broad scope of usable substrates are other prominent features of the present methodology.
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Journal title
volume 7 issue Issue 2, pp. 125-241
pages 142- 152
publication date 2019-04-01
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