Synthesis 2012(8): 1268-1278  
DOI: 10.1055/s-0031-1290807
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Synthesis of Cyclopentacarbazolones via Palladium-Catalyzed Annulation of Internal Alkynes

Devanga K. Sreenivas, Jatoth Sandhyarani, Rajagopal Nagarajan*
School of Chemistry, University of Hyderabad, Hyderabad 500046, India
Fax: +91(40)23012460; e-Mail: rnsc@uohyd.ernet.in;
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Publication History

Received 8 December 2011
Publication Date:
27 March 2012 (online)

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Abstract

A simple and efficient protocol for the synthesis of highly substituted cyclopentacarbazolones (50-82%) was developed by employing internal alkynes with 2-bromo-3-formylcarbazoles in the presence of palladium catalyst under ligand-free condition. High regioselectivity was observed for unsymmetrical (alkyl-, aryl-­substituted) internal alkynes.