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Synthetic Communications
An International Journal for Rapid Communication of Synthetic Organic Chemistry
Volume 38, 2008 - Issue 20
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Original Articles

Phosphomolybdic Acid/SiO2 as Heterogeneous Solid Acid Catalyst for the Rapid Synthesis of N-Substituted Pyrroles

, , , &
Pages 3456-3464 | Received 05 Mar 2008, Published online: 29 Sep 2008
 

Abstract

Isatins react efficiently with 4-hydroxyproline in the presence of 10 mol% of PMA/SiO2 in acetonitrile/water (4:1) under reflux conditions to furnish N-substituted pyrroles in excellent yields. Similarly, 11H-indeno[1,2-b]quinoxalin-11-ones also participated in this reaction.

ACKNOWLEDGMENTS

The authors express thanks to Prof. C. Devendranath Reddy and Dr. C. Naga Raju, Department of Chemistry, S. V. University, Tirupati, for their helpful discussions, and the director, Indian Institute of Sciences, Bangalore, India, for providing the spectral data.

Notes

a All products were characterized by IR, 1H NMR, 13C NMR, and mass spectroscopy.

b Yields of pure products after chromatography.

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