Elsevier

Tetrahedron Letters

Volume 56, Issue 5, 28 January 2015, Pages 666-673
Tetrahedron Letters

An efficient synthesis of 3-indolyl-3-hydroxy oxindoles and 3,3-di(indolyl)indolin-2-ones catalyzed by sulfonated β-CD as a supramolecular catalyst in water

https://doi.org/10.1016/j.tetlet.2014.12.012Get rights and content

Abstract

Sulfonated-β-cyclodextrin (β-CD-SO3H) promoted efficient and fast electrophilic substitution reaction of indoles with various isatins reflux in water is reported affording various 3-indolyl-3-hydroxy oxindoles and 3,3-di(indolyl)indolin-2-ones in good to excellent yields in short reaction time.

Keywords

Sulfonated-β-cyclodextrin
3,3-Di(indolyl)indolin-2-ones
Recyclable catalyst

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