furans are conveniently synthesized from acyclic secondary 1-alkyl-2-alkynylallylic alcohol precursors via an ICl-promoted cyclization reaction. The furans generated by this method incorporate both iodine and chlorine atoms which may be useful for further elaborations via many known methods. The methodology is suitable for generating a wide array of furan products which can serve as useful building blocks
Cyclization of 2-Alkynylallyl Alcohols to Highly Substituted Furans by Gold(I)-Carbene Complexes
作者:A. Stephen K. Hashmi、Tobias Häffner、Matthias Rudolph、Frank Rominger
DOI:10.1002/ejoc.201001479
日期:2011.2
Various 2-alkynylallylalcohols were synthesized by a generally applicable Sonogashira coupling protocol. Subsequent gold-catalyzed transformation was investigated. The use of AuI catalysts bearing carbene ligands, of either the N-heterocyclic carbene or nitrogen acyclic carbene type, delivered the desired products with low catalyst loadings and under very mild reaction conditions. A broad array of