Electrophilic Heteroannulation Strategy for the Synthesis of 2-Chalcogenbenzofurans
F. Manarin, J. A. Roehrs, R. Mozzaquatro Gay, R. Brandão, P. H. Menezes, C. W. Nogueira, G. Zeni*
Universidade Federal de Santa Maria and Universidade Federal de Pernambuco, Recife, Brazil
25. Mai 2009 (online)
Reported is a heteroannulation strategy to benzofurans from 2-chalcogenalkynylanisoles triggered by electrophilic reaction with either iodine, iodine chloride, bromine or phenyl-selenyl bromide. Although the proposed mechanism for the reaction is entirely reasonable if not highly likely, no evidence was provided to support it.