Mixed AuPd Nanoparticles as Highly Active Catalysts for Alkyne <i>Z</i>
-Semihydrogenation
作者:Maren Wissing、Maximilian Niehues、Bart Jan Ravoo、Armido Studer
DOI:10.1002/ejoc.201800583
日期:2018.7.13
Two metals are better than one! Readily prepared mixed AuPd nanoparticles with a diameter of around 2.6 nm show high catalyst activity for the selective Z‐semihydrogenation of various alkynes. The corresponding monometallic Au nanoparticles show no activity and the monometallic Pd system displays significantly lower activity documenting the cooperative effect of the two metals.
A Sustainable, User-Friendly Protocol for the Pd-Free Sonogashira Coupling Reaction
作者:Aggeliki A. Liori、Ioannis K. Stamatopoulos、Argyro T. Papastavrou、Afroditi Pinaka、Georgios C. Vougioukalakis
DOI:10.1002/ejoc.201800827
日期:2018.12.2
An efficient, user‐friendly protocol for the Pd‐free, Cu‐catalyzedSonogashiracross‐couplingreaction was developed. The (pre)catalytic species utilized are low‐cost, stable, and widely available: CuSO4·5H2O as the copper source, an NHC salt precursor, and K2CO3 as the base.
针对无钯,铜催化的Sonogashira交叉偶联反应,开发了一种高效,用户友好的方案。所使用的(预)催化物质成本低廉,稳定且可广泛获得:CuSO 4 · 5H 2 O作为铜源,NHC盐前体和K 2 CO 3作为碱。
One-Pot Conversion of Aldehydes and Aryl Halides to Disubstituted Alkynes via Tandem Seyferth–Gilbert Homologation/Copper-Free Sonogashira Coupling
作者:Alexander Sapegin、Mikhail Krasavin
DOI:10.1021/acs.joc.9b01367
日期:2019.7.5
convenient protocol has been developed to convert a mixture of an aldehyde, aryl halide, and the Bestmann–Ohira reagent into disubstituted acetylene via a successive addition of base (Cs2CO3) and a Pd(II) catalyst, allowing sufficient time after addition of each of these reagents for the tandem processes (Seyferth–Gilbert homologation and Sonogashira coupling) to occur. Notably, for the latter reaction
通过连续添加碱(Cs 2 CO 3)和Pd(II)催化剂,已开发出一种实用方便的方案,可将醛,芳基卤化物和Bestmann-Ohira试剂的混合物转化为二取代乙炔。加入上述每种试剂后,就会发生串联过程(Seyferth-Gilbert同源和Sonogashira偶联)。值得注意的是,对于后一反应,不需要铜催化剂。
Synthesis of ferrocene[c]pyridin-2(1H)-one derivatives via Pd(II)-catalyzed C–H activation reaction under air
A Pd(II)-catalyzed C–H activation annulation under air has been successfully developed for efficient synthesis of ferrocene[c]pyridin-2(1H)-onederivatives with high yields and good regiochemistry. This method shows highly atom- and step-economical access to prepare ferrocene-fused heterocycles under mild conditions.
已成功开发了一种在空气中以Pd(II)催化的C–H活化环化技术,可高效合成高茂铁[ c ]吡啶2-2(1 H)-one衍生物,并具有良好的区域化学性质。该方法显示了在温和条件下制备二茂铁稠合杂环的高度原子和步骤经济的途径。