Preparation and characterization of supported bimetallic gold–iron nanoparticles, and its potential for heterogeneous catalysis
作者:Ghaniya Ferouani、Nawal Ameur、Redouane Bachir
DOI:10.1007/s11164-019-04039-0
日期:2020.2
Bimetallic gold–iron catalysts supported on ZrO2 and TiO2 were prepared by under potential deposition. The characterization of the catalysts was performed using an inductively coupled plasma, energy-dispersive spectroscopy, diffuse reflectance ultraviolet–visible spectroscopy (DR/UV–vis), and transmission electron microscopy. The catalytic properties of the prepared materials in synthesis of isoxazol-5-(4H)-ones
通过电势沉积法制备了负载在ZrO 2和TiO 2上的双金属金铁催化剂。催化剂的表征使用电感耦合等离子体,能量色散光谱,漫反射紫外可见光谱(DR / UV-vis)和透射电子显微镜进行。研究了制备的材料在芳香醛,乙酰乙酸乙酯和盐酸羟胺的一锅三组分反应中合成异恶唑-5-(4H)-一的催化性能。通过1 H NMR,1 H证实了不同反应产物的化学结构。1 H NMR。我们的简单方法的显着优势发生在高效,简单,清洁,绿色,温和的条件下,并且易于后处理,从而使不同的异恶唑-5-(4H)-异构体获得了良好或高收率(66-78%)。催化剂的再利用表明该催化剂可以使用多达三个循环,而产物的收率没有任何变化。
One-pot and Three-Component Synthesis of isoxazol-5(4H)-one Derivatives in the presence of Citric Acid
作者:Ashkan bashash Rikani、Davood Setamdideh
DOI:10.13005/ojc/320317
日期:2016.6.28
In this context, the one-pot three-component synthesis of 3-methyl-4-arylmethylene-isoxazol-5(4H)-ones has been performed in the presence of citric acid as catalyst in water. The products have been obtained in high yields (70-90%) and convenient reaction times (5-24 hours).
An efficient, simple, and green procedure for the synthesis of isoxazol‐5(4H)‐one derivatives are described here through a convenient one‐pot, three‐component reaction at room temperature. The title compounds are isolated in high to excellent yields and after short reaction times, and are characterized by various spectroscopic methods such as IR, 1H NMR, and 13C NMR. The synthesized compounds 4a–c
通过在室温下方便的一锅三组分反应,描述了一种高效,简单,绿色的合成异恶唑-5(4 H)-一衍生物的方法。在短的反应时间之后,以高至优异的产率分离出标题化合物,并通过各种光谱学方法如IR,1 H NMR和13 C NMR对其进行表征。合成的化合物4a–c和4e–i 测试了它们对一系列革兰氏阳性和革兰氏阴性细菌的体外活性,证明了它们抑制微生物的能力,抑制范围为15至30 mm,最小抑制浓度在250至900μg/ mL之间,并且最小细菌浓度在700至1000μg/ mL之间。
Synthetic enzyme-catalyzed multicomponent reaction for Isoxazol-5(4<i>H</i>)-one Syntheses, their properties and biological application; why should one study mechanisms?
作者:Gabriela H. C. Oliveira、Luciana M. Ramos、Raíssa K. C. de Paiva、Saulo T. A. Passos、Marina M. Simões、Fabricio Machado、José R. Correa、Brenno A. D. Neto
DOI:10.1039/d0ob02114h
日期:——
In this work, we describe the application of a synthetic enzyme (synzyme) as the catalyst to promote the multicomponent synthesis of isoxazol-5(4H)-one derivatives. The catalytic system could be used up to 15 times without any notable loss of its activity. Some derivatives showed fluorescence and their photophysical data were evaluated. The mechanism of the reaction was, for the first time, investigated
Selective Reduction of the Exocyclic Double Bond of Isoxazolones and Pyrazolones by Hantzsch 1,4-Dihydropyridine
作者:Wei Yu、Zhengang Liu、Bing Han、Qiang Liu、Wei Zhang、Li Yang、Zhong-Li Liu
DOI:10.1055/s-2005-869860
日期:——
Hantzsch 1,4-dihydropyridine (HEH) was used to realize the selective reduction of the exocyclic double bond of 4-arylmethylene- and 4-alkylidene-4H-isoxazol-5-ones and 4-arylmethylene-4H-pyrazol-5-ones.