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Short Paper | Regular issue | Vol 83, No. 1, 2011, pp.117-123
Published online, 24th November, 2010
DOI: 10.3987/COM-10-12074
Heck Reactions in 2,6-Diaryl-3,5-dibromo-4-pyrones in the Presence of N,N’-Dibutylbenzimidazolium Bromide

Zarrin Ghasemi, Vahideh Nazari-Belvirdi, Maryam Allahvirdinasab, and Aziz Shahrisa*

*Department of Organic and Bioorganic Chemistry, Faculty of Chemistry, University of Tabriz, 51664, Tabriz, Iran

Abstract

Synthesis of two 2,6-diaryl-3,5-dibromo-4-pyrone derivatives is described, by using of NBS/DMF bromination of related 2,6-diaryl-4-pyrones. PdCl2 catalyzed Heck coupling reactions of these dibromides, with emphasis on the use of N,N′-dibutylbenzimidazol-2-ylidene as ligand, resulted in the formation of two class of mono- and di-vinylated products.