Rhodium-Catalyzed Chemo- and Regioselective Cross-Dimerization of Two Terminal Alkynes
作者:Hua-Dong Xu、Ren-Wei Zhang、Xiaoxun Li、Suyu Huang、Weiping Tang、Wen-Hao Hu
DOI:10.1021/ol303531m
日期:2013.2.15
Cross-dimerization of terminal arylacetylenes and terminal propargylic alcohols/amides has been achieved in the presence of a rhodium catalyst. This method features high chemo- and regioselectivities rendering convenient and atom economical access to functionalized enynes.
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