Three-Component One-Pot Synthesis of Unsymmetrical Diarylalkynes by Thermocontrolled Sequential Sonogashira Reactions Using Potassium Ethynyltrifluoroborate
作者:Taejung Kim、Kyu Hyuk Jeong、Youngseok Kim、Taesub Noh、Jaeyoung Choi、Jungyeob Ham
DOI:10.1002/ejoc.201700110
日期:2017.5.3
Sonogashira reactions with potassium ethynyltrifluoroborate and two different reactive aryl halides. The one-pot procedure was initiated by the palladium/copper-catalyzed Sonogashira coupling of potassium ethynyltrifluoroborate to an aryliodide or electron-deficient aryl bromide at 40 °C. Following a subsequent deboronative Sonogashira reaction of the in situ generated potassium (arylethynyl)trifluoroborate
Palladium NPs supported on novel imino-pyridine-functionalized MWCNTs: efficient and highly reusable catalysts for the Suzuki–Miyaura and Sonogashira coupling reactions
作者:Mehdi Adib、Rahman Karimi-Nami、Hojat Veisi
DOI:10.1039/c5nj02842f
日期:——
In this article a new heterogeneous nanocatalyst based on palladium supported on functionalized multi-walled carbon nanotubes (MWCNTs) has been introduced.
在这篇文章中,介绍了一种基于功能化多壁碳纳米管(MWCNTs)载铂的新型异质纳米催化剂。
Reusable Cu<sub>2</sub>O/PPh<sub>3</sub>/TBAB System for the Cross-Couplings of Aryl Halides and Heteroaryl Halides with Terminal Alkynes
Cu2O/PPh3/TBAB (n-Bu4NBr) system for the cross-couplingreactions of aryl and heteroarylhalides with terminal alkynes has been developed. Four types of Cu2O, including bulky Cu2O, cubic Cu2O nanoparticles, octahedral Cu2O nanoparticles, and spherical Cu2O nanoparticles, were examined, and the octahedral Cu2O nanoparticles were found to be the most effective catalyst for the reaction. In the presence of the octahedral
Palladium nanoparticles immobilized on EDTA-modified Fe<sub>3</sub>
O<sub>4</sub>
@SiO<sub>2</sub>
nanospheres as an efficient and magnetically separable catalyst for Suzuki and Sonogashira cross-coupling reactions
The catalyst was used in Suzuki cross‐coupling reactions of various aryl halides, including less reactive chlorobenzenes with phenylboronic acid without any additive or ligand under green conditions. Furthermore, we have reported this recyclable catalytic system for Sonogashira cross‐coupling reactions of various aryl halides (I, Br, Cl) under copper and ligand‐free conditions in the presence of DMF/H2O
在这项研究中,通过将钯固定在乙二胺四乙酸(EDTA)涂层的Fe 3 O 4 @SiO 2磁性纳米复合材料上,合成了一种新型的非均相钯催化剂,并将其用于Suzuki和Sonogashira交叉偶联反应。FT-IR,XRD,TEM,FE-SEM,DLS EDX,XPS,N 2表征了磁性催化剂的性能用ICP进行吸附-解吸等温线分析,TGA,VSM,元素分析和催化剂中Pd的负载量为0.51 mmol / g。在绿色条件下,该催化剂用于各种芳基卤化物的Suzuki交叉偶联反应,包括反应性较低的氯苯与苯基硼酸,无任何添加剂或配体。此外,我们已经报道了在DMF / H 2 O(1:2 / v:v)存在下,无铜和无配体条件下,各种芳基卤化物(I,Br,Cl)的Sonogashira交叉偶联反应的可循环催化体系。)作为溶剂。磁性催化剂也可以由外部磁体分离并重复使用六次,而活性没有任何显着损失。
N-heterocyclic carbene-Pd(II) complex based on theophylline supported on Fe3O4@SiO2 nanoparticles: Highly active, durable and magnetically separable catalyst for green Suzuki-Miyaura and Sonogashira-Hagihara coupling reactions
phosphine-free Pd catalyst for the Sonogashira cross-coupling of aryl halides (I, Br, Cl) with terminal aromatic and aliphatic alkynes under solvent-free conditions. All coupling reactions proceeded with good to excellent yields. The catalyst showed good stability and was recovered and reused for eight reaction cycles without a significant loss in its catalytic activity. Also, the leaching of the catalyst has been
本文通过将基于茶碱的N-杂环卡宾-Pd(II)配合物固定在磁性Fe 3 O 4 @SiO 2纳米粒子上,合成了一种新型的非均相钯催化剂。通过傅立叶变换红外光谱(FT-IR),X射线衍射(XRD),X射线光电子能谱(XPS),能量色散X射线分析(EDX),热重分析(TGA)对合成的磁性复合材料进行表征振动样品磁力计(VSM),透射电子显微镜(TEM),场发射扫描电子显微镜(FE-SEM),动态光散射(DLS),N 2吸附-解吸等温线分析(BET),紫外可见光谱和元素分析。另外,通过电感耦合等离子体(ICP)分析来测量钯在催化剂上的负载量。合成的催化剂已成功用于各种芳基卤化物(I,Br,Cl)与苯基硼酸的Suzuki交叉偶联反应。该反应最好在60°C下仅在0.37–0.5 mol%的催化剂存在下于绿色溶剂水中进行。同样,我们已经报道了这种可循环使用的催化体系,它是在无溶剂条件下,将芳基卤化物(