Pd-Tetrahydrosalan-Type Complexes as Catalysts for Sonogashira Couplings in Water: Efficient Greening of the Procedure
作者:Krisztina Voronova、Levente Homolya、Antal Udvardy、Attila C. Bényei、Ferenc Joó
DOI:10.1002/cssc.201402147
日期:2014.8
diphenylacetylenes can be isolated in 76–98 % yield. The aqueous catalyst solution can be recycled four times with decreasing activity; however, yields between 93 and 98 % can still be achieved with extended reaction times. Several water‐insoluble products can be isolated in excellent yield by simple filtration and purification by washing with water; this method is used, for the first time, for this type
合成了新的磺化四氢salen型配体及其水溶性钯(II)配合物。钯(II)配合物催化各种芳基卤化物(包括氯代芳烃)与末端炔烃的Sonogashira偶联(23个实例),在温和条件下(80°C,空气,无Cu I助催化剂)在有机水溶液中具有良好至优异的转化率混合物和周转频率高达2790 h -1。在优化的反应条件下,以最小化环境污染,可以分离出76.98%的二苯乙炔。催化剂水溶液可以降低活性地循环使用四次。但是,延长反应时间仍可实现93%至98%的收率。通过简单的过滤和水洗纯化,可以分离出几种不溶于水的产物,收率很高。这种方法首次用于这种CC耦合过程。
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
with copper(I) chloride was employed for the first time in Sonogashira cross-coupling reactions of phenylacetylene with various aryl halides. The goal was to use an efficient green media by using copper instead of palladium in metal-catalyzed coupling reactions. Monobenzyl nicotinium chloride, a quaternary ammonium salt containing a coordinating centre, plays an important role in this catalytic system
[EN] TRIAZOLOPYRIDINE INHIBITORS OF MYELOPEROXIDASE AND/OR EPX<br/>[FR] INHIBITEURS DE LA MYÉLOPEROXYDASE ET/OU DE L'EPX À BASE DE TRIAZOLOPYRIDINES
申请人:BRISTOL MYERS SQUIBB CO
公开号:WO2017161145A1
公开(公告)日:2017-09-21
The present invention provides compounds of Formula (I); wherein the substituents are each as defined in the specification, and compositions comprising any of such novel compounds. These compounds are myeloperoxidase (MPO) inhibitors and/or eosinophil peroxidase (EPX) inhibitors, and may be useful for for the treatment and/or prophylaxis of atherosclerosis, heart failure, chronic obstructive pulmonary disease (COPD), and related diseases.
Sonogashira Reaction of Aryl and Heteroaryl Halides with Terminal Alkynes Catalyzed by a Highly Efficient and Recyclable Nanosized MCM-41 Anchored Palladium Bipyridyl Complex
A heterogeneous catalyst, nanosized MCM-41-Pd, was used to catalyze the Sonogashira coupling of aryl and heteroaryl halides with terminal alkynes in the presence of CuI and triphenylphosphine. The coupling products were obtained in high yields using low Pd loadings to 0.01 mol%, and the nanosized MCM-41-Pd catalyst was recovered by centrifugation of the reaction solution and re-used in further runs without significant loss of reactivity.