The core of the matter – arene substitution determines the coordination and catalytic behaviour of tris(1-phosphanyl-1′-ferrocenylene)arene gold(<scp>i</scp>) complexes
作者:Axel Straube、Peter Coburger、Marvin Michak、Mark R. Ringenberg、Evamarie Hey-Hawkins
DOI:10.1039/d0dt02743j
日期:——
effects on their coordination behaviour towards gold(I). Depending on the arene (s-triazine, benzene, or trifluorobenzene), four different coordination modes can be distinguished and their preference has been rationalised using computational methods. The corresponding 1:1 ligand-to-metal complexes, studied by variable-temperature NMR spectroscopy, revealed fluctional behaviour in solution. Given the presence
Merging gold catalysis, organocatalytic oxidation, and Lewis acid catalysis for chemodivergent synthesis of functionalized oxazoles from N-propargylamides
作者:Shaoyu Mai、Changqing Rao、Ming Chen、Jihu Su、Jiangfeng Du、Qiuling Song
DOI:10.1039/c7cc05746f
日期:——
Novel catalytic systems consisting of cationicgold complexes, N-hydroxyphthalimide (NHPI), and transition-metal-based Lewis acids have been developed for the one-pot synthesis of functionalized oxazoles from N-propargylamides with excellent functional group tolerance. These transformations demonstrated the excellent compatibility of homogeneous goldcatalysis with organocatalytic oxidative carbon–nitrogen
An Industrial Perspective on Counter Anions in Gold Catalysis: On Alternative Counter Anions
作者:Jasmin Schießl、Jürgen Schulmeister、Angelino Doppiu、Eileen Wörner、Matthias Rudolph、Ralf Karch、A. Stephen K. Hashmi
DOI:10.1002/adsc.201800629
日期:2018.10.18
counter anions was investigated by means of a variety of well‐known test reactions representing the key reactivity patterns of homogeneous gold catalysis, the catalytic activity was monitored by GC and 1H NMR. As previously reported, the counter anion influence is usually more pronounced than the corresponding ligand effect. Due to this, the study is focused on the investigation of counter anions so far
通过多种代表均相金催化关键反应模式的众所周知的测试反应,研究了多用途抗衡阴离子的比较,并通过GC和1 H NMR监测了催化活性。如前所述,抗衡阴离子的影响通常比相应的配体效应更为明显。因此,本研究的重点是迄今为止对均金催化反应的研究中还没有包括的抗衡阴离子的研究。使用到目前为止被忽略的抗衡阴离子(BAr F 4)-,[B(C 6 F 5)4 ] -,[Al(OC(CF 3)3)4 ] -和[B(C 6 F 5)3(OAc F)] -表现出超过或至少与常用抗衡阴离子相似的催化活性。抗衡阴离子的广泛使用在将来有关金催化中的催化剂优化方面可发挥重要作用。
Efficient One-Pot Synthesis of Unsymmetrical Gold(I) N-Heterocyclic Carbene Complexes and Their Use as Catalysts
作者:A. Stephen K. Hashmi、Yang Yu、Frank Rominger
DOI:10.1021/om2008919
日期:2012.2.13
Eleven different gold(I) complexes of new NHC ligands were prepared in excellent yield, demonstrating the versatility of the new route to NHC complexes. While the influence of electronically different ligands on the synthesis of the catalysts was small, the catalytic activities of the products differed significantly.
Silver-Catalyzed Cyclization of Propargylic Amides to Oxazolines
作者:Valerie H. L. Wong、Andrew J. P. White、T. S. Andy Hor、King Kuok Mimi Hii
DOI:10.1002/adsc.201500610
日期:2015.12.14
is observed in the cyclization of propargylicamides catalyzed by bis(pyridyl)silver(I) complexes, with an unexpected reversal of electronic demand to the analogous NH addition reaction. The catalyst was found to be effective for internal alkyne substrates, offering exclusive selectivity for the 5-exo-dig product. Differences in selectivity profile between gold- and silver-catalyzed processes are highlighted