Palladium-catalyzed acylation and/or homo-coupling of aryl- and alkyl-acetylenes
作者:Serena Perrone、Fabio Bona、Luigino Troisi
DOI:10.1016/j.tet.2011.07.032
日期:2011.9
Allyl or benzyl halides, through a Pd(0)-catalyzed reaction and under CO pressure, generate acyl-palladium/halides that, in the presence of a base and an aryl- and alkyl-acetylene, undergo nucleophilic acyl substitution giving conjugated acetylenic ketones. Diynes, resulting from allcyne/alkyne homo-coupling, were instead the main products in reactions performed without allyl or benzyl halides. Moreover, dimerization, trimerization, and cyclotrimerization reactions of acetylenes were observed in reaction carried out even without base. (C) 2011 Elsevier Ltd. All rights reserved.
Double Gold-Catalysed Annulation of Indoles by Enynones
作者:Stephen J. Heffernan、James P. Tellam、Marine E. Queru、Andrew C. Silvanus、David Benito、Mary F. Mahon、Alan J. Hennessy、Benjamin I. Andrews、David R. Carbery
DOI:10.1002/adsc.201300018
日期:2013.4.15
The gold‐catalysed double functionalisation of indoles is presented. Enynones are used to annulate indoles via a double sodium tetrachloroaurate‐catalysed process involving a mixture of CH activation and alkyne activation modes of promotion. Good yields for the formation of medicinally relevant [6,5,7]‐tricyclic indoles are realised.