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.
Reactivity of 3-silyloxy-1,4-enynes: Gold(III)-catalyzed regioselective nucleophilic substitution
作者:Timm T. Haug、Tobias Harschneck、Alexander Duschek、Chang-Uk Lee、Jörg T. Binder、Helge Menz、Stefan F. Kirsch
DOI:10.1016/j.jorganchem.2008.09.062
日期:2009.2
Gold-catalyzed reactions of 3-silyloxy-1,4-enynes with alcohols afford primary, secondary, and tertiary pent-2-en-4-ynyl ethers in moderate to excellent yields. The substitution proceeds with high regioselectivity. An initial cyclization providing five-membered carbocycles instead was not observed under the reaction conditions. Control experiments show that these reactions are also catalyzed by Bronsted- and Lewis-acids, although scope and yields are markedly reduced. (C) 2008 Elsevier B.V. All rights reserved.
Diastereoselective [4 + 1] Cycloaddition of Alkenyl Propargyl Acetates with CO Catalyzed by [RhCl(CO)<sub>2</sub>]<sub>2</sub>
作者:Wei Chen、Jia-Hui Tay、Xiao-Qi Yu、Lin Pu
DOI:10.1021/jo3009403
日期:2012.7.20
A class of alkenyl propargyl acetates, RCH(OAc)C CC(CH3)=CH2 (5), are found to undergo [4 + 1] cycloaddition with CO (1 atm) in the presence of [RhCl(CO)(2)](2) in refluxing 1,2-dichloroethane to give cyclopentenones (6) in good yields. It has been demonstrated that, when the R group of 5 is a phenyl group bearing o-electron-withdrawing substituents up to 10:1 diastereoselectivity and 96% yield can be achieved for the [4 + 1] cycloaddition. This process provides a convenient method to construct highly functionalized cyclopentenones that are useful in organic synthesis.
Parker et al., Journal of the Chemical Society, 1958, p. 3871,3873
作者:Parker et al.
DOI:——
日期:——
Stereospecific Synthesis of 2,3-Dihydro-4<i>H</i>-pyran-4-ones by Hg(II)- Catalyzed Rearrangement of 1-Alkynyl-2,3-epoxy Alcohols
作者:Charles M. Marson、Steven Harper、Catriona A. Oare、Timothy Walsgrove