Synthesis 2013; 45(20): 2853-2860
DOI: 10.1055/s-0033-1339651
paper
© Georg Thieme Verlag Stuttgart · New York

Synthesis of 1,2-Diaryl-6,6-dimethyl-5,6-dihydro-1H-indole-4,7-diones from Arylglyoxals and Enamines through Domino Condensation and Allylic Hydroxylation­

Subhendu Maity
Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700 009, India   Fax: +91(33)23519755   Email: animesh_in2001@yahoo.co.in
,
Animesh Pramanik*
Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700 009, India   Fax: +91(33)23519755   Email: animesh_in2001@yahoo.co.in
› Author Affiliations
Further Information

Publication History

Received: 17 June 2013

Accepted after revision: 30 July 2013

Publication Date:
29 August 2013 (online)


Abstract

A series of fused pyrrole derivatives, 1,2-diaryl-7-hydroxy-6,6-dimethyl-1,5,6,7-tetrahydro-4H-indol-4-ones, have been synthesized by refluxing mixtures of enamines of 5,5-dimethyl-1,3-cyclohexadione (dimedone) and arylglyoxals in the non-nucleophilic solvent acetonitrile. These pyrrole derivatives are formed through domino condensation of the enamines and arylglyoxals followed by annulation and allylic hydroxylation. Oxidation of the pyrrole derivatives with chromium trioxide in pyridine produced the oxidized products, 1,2-diaryl-6,6-dimethyl-5,6-dihydro-1H-indole-4,7-di­ones, in good yields.

Supporting Information

 
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