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Synthesis 2012(8): 1268-1278
DOI: 10.1055/s-0031-1290807
DOI: 10.1055/s-0031-1290807
PAPER
© Georg Thieme Verlag
Stuttgart ˙ New York
Synthesis of Cyclopentacarbazolones via Palladium-Catalyzed Annulation of Internal Alkynes
Further Information
Publication History
Received
8 December 2011
Publication Date:
27 March 2012 (online)


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.
Key words
estrogen receptors - palladium catalyst - annulations - cyclopentacarbazolones - ligand-free synthesis