Silver-Free Activation of Ligated Gold(I) Chlorides: The Use of [Me<sub>3</sub>NB<sub>12</sub>Cl<sub>11</sub>]<sup>−</sup>as a Weakly Coordinating Anion in Homogeneous Gold Catalysis
作者:Michael Wegener、Florian Huber、Christoph Bolli、Carsten Jenne、Stefan F. Kirsch
DOI:10.1002/chem.201404487
日期:2015.1.12
Phosphane and N‐heterocycliccarbene ligated gold(I) chlorides can be effectively activated by Na[Me3NB12Cl11] (1) under silver‐free conditions. This activation method with a weakly coordinating closo‐dodecaborate anion was shown to be suitable for a large variety of reactions known to be catalyzed by homogeneous gold species, ranging from carbocyclizations to heterocyclizations. Additionally, the
在无银条件下,Na [Me 3 NB 12 Cl 11 ](1)可以有效活化磷化氢和N-杂环卡宾相连的氯化金(I)。这种具有弱配位的活化方法闭合碳-dodecaborate阴离子被证明是适合于大量的各种已知由均匀的金物种催化的反应,从carbocyclizations到heterocyclizations的。此外,还证明了1在以前未知的5-甲硅烷氧基-1,6-炔烃转化中的能力。
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.
Pt-catalyzed cyclization/migration of propargylic alcohols for the synthesis of 3(2H)-furanones, pyrrolones, indolizines, and indolizinones
作者:Eric M. Bunnelle、Cameron R. Smith、Sharon K. Lee、Surendra W. Singaram、Allison J. Rhodes、Richmond Sarpong
DOI:10.1016/j.tet.2008.02.103
日期:2008.7
Several heterocycles such as furanones, pyrrolones, and indolizines, which are of pharmacological importance, are easily accessed via the Pt(II)-catalyzed heterocyclization/1,2-migration of propargylic ketols or hydroxy imine derivatives. This method sidesteps the challenges of traditional heteroaromatic oxygenation strategies such as regioselectivity and functional group tolerance in the syntheses of these heterocycles. (C) 2008 Elsevier Ltd. All rights reserved.
Gold(III)- and Platinum(II)-Catalyzed Domino Reaction Consisting of Heterocyclization and 1,2-Migration: Efficient Synthesis of Highly Substituted 3(2H)-Furanones
作者:Stefan F. Kirsch、Jörg T. Binder、Clémence Liébert、Helge Menz
DOI:10.1002/anie.200601836
日期:2006.9.4
Synthesis of Heterocyclic Systems by Transition-Metal-Catalyzed Cyclization-Migration Reactions – A Diversity-Oriented Strategy for the Construction of Spirocyclic 3(2H)-Furanones and 3-Pyrrolones
作者:Jörg T. Binder、Benedikt Crone、Stefan F. Kirsch、Clémence Liébert、Helge Menz
DOI:10.1002/ejoc.200601060
日期:2007.4
proceed through an oxonium ionintermediate B, which triggers a stereospecific 1,2-shift analogous to an α-ketol rearrangement. When exploited in a different manner, the 2-alkynyl-2-hydroxy carbonyl compounds 1 afford 3-pyrrolones 3 in 33–81 % yield. For this purpose, the starting compounds 1 are treated with primary amines in the presence of 5 mol-% of PtCl2 at 100 °C in a convenient one-pot process. These