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。
Palladium-Catalyzed Carbene Coupling Reactions of Cyclobutanone <i>N</i>-Sulfonylhydrazones
作者:Xiaoqin Ning、Yongke Chen、Fangdong Hu、Ying Xia
DOI:10.1021/acs.orglett.1c03052
日期:2021.11.5
Described herein are the palladium-catalyzed cross-couplingreactions of cyclobutanone-derived N-sulfonylhydrazones with aryl or benzyl halides, suggesting that the metal carbene process and β-hydride elimination can smoothly occur in strained ring systems. Structurally diversified products including cyclobutenes, methylenecyclobutanes, and conjugated dienes are selectively afforded in good to excellent
Cyclobutene vs 1,3-Diene Formation in the Gold-Catalyzed Reaction of Alkynes with Alkenes: The Complete Mechanistic Picture
作者:M. Elena de Orbe、Laura Amenós、Mariia S. Kirillova、Yahui Wang、Verónica López-Carrillo、Feliu Maseras、Antonio M. Echavarren
DOI:10.1021/jacs.7b03005
日期:2017.8.2
The intermoleculargold(I)-catalyzed reaction between arylalkynes and alkenes leads to cyclobutenes by a [2 + 2] cycloaddition, which takes place stepwise, first by formation of cyclopropyl gold(I) carbenes, followed by a ring expansion. However, 1,3-butadienes are also formed in the case of ortho-substituted arylalkynes by a metathesis-type process. The corresponding reaction of alkenes with aryl-1
芳基炔烃与烯烃之间的分子间金(I)催化反应通过[2 + 2]环加成反应逐步生成环丁烯,该过程逐步进行,首先形成环丙基金(I)卡宾,然后进行环扩环。但是,在邻位的情况下也会形成1,3-丁二烯复分解型方法取代了芳基炔烃。烯基与芳基炔烃对应的烯烃与芳基-1,3-丁二炔的相应反应仅产生环丁烯。在密度泛函理论计算的基础上,提出了炔烃与烯烃的金(I)催化反应的综合机理,表明生成环丁烯或二烯的两条途径的能量非常接近。关键中间体是环丙基金(I)卡宾,它们是通过逆向布赫纳反应从立体定义的1a,7b-二氢-1 H-环丙烷[ a ]萘独立生成的。
Variations on the Theme of JohnPhos Gold(I) Catalysts: Arsine and Carbene Complexes with Similar Architectures
作者:Javier Carreras、Ana Pereira、Margherita Zanini、Antonio M. Echavarren
DOI:10.1021/acs.organomet.8b00276
日期:2018.10.22
carbene gold(I) complexes with architectures closely related to those of 2-(di-tert-butylphosphino)biphenyl gold(I) complexes have been prepared and structurally characterized. As predicted, 2-(di-tert-butylarsine)biphenyl gold(I) complexes are more electrophilic catalysts in comparison to their phosphine analogues, whereas those based on 4-arylindazole behave similarly to NHC-gold(I) catalysts.
Ylide-Functionalized Phosphines: Strong Donor Ligands for Homogeneous Catalysis
作者:Thorsten Scherpf、Christopher Schwarz、Lennart T. Scharf、Jana-Alina Zur、Andreas Helbig、Viktoria H. Gessner
DOI:10.1002/anie.201805372
日期:2018.9.24
phosphorus center the ligands are unusually electron‐rich and can thus function as strong electron donors. The donor capacity surpasses that of commonly used phosphines and carbenes and can easily be tuned by changing the substitution pattern at the ylidic carbon atom. The huge potential of ylide‐functionalized phosphines in catalysis is demonstrated by their use in goldcatalysis. Excellent performance