Carbon–SO3H: a novel and recyclable solid acid catalyst for the synthesis of spiro[4H-pyran-3,3′-oxindoles]

A bioglycerol derived carbon-sulfonic acid is found to catalyze efficiently the three-component one-pot condensation of isatin, malononitrile, and 1,3-dicarbonyls to afford a wide range of spiro[4H-pyran-3,3′-oxindole]derivatives in good yields and selectivity. The use of a recyclable solid acid cat...

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Bibliographic Details
Published in:Tetrahedron letters 2013-05, Vol.54 (20), p.2466-2471
Main Authors: Maheshwar Rao, B., Reddy, G. Niranjan, Reddy, T. Vijaikumar, Devi, B.L.A. Prabhavathi, Prasad, R.B.N., Yadav, J.S., Reddy, B.V. Subba
Format: Article
Language:English
Subjects:
1,3-Dicarbonyls
Domino reaction
Isatins
Malononitrile
Solid acid catalysis
Spirooxindoles
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Summary:A bioglycerol derived carbon-sulfonic acid is found to catalyze efficiently the three-component one-pot condensation of isatin, malononitrile, and 1,3-dicarbonyls to afford a wide range of spiro[4H-pyran-3,3′-oxindole]derivatives in good yields and selectivity. The use of a recyclable solid acid catalyst makes this method simple, convenient, and cost-effective.
ISSN:0040-4039
1873-3581
DOI:10.1016/j.tetlet.2013.02.089