Bimetallic Co–Pd alloy nanoparticles as magnetically recoverable catalysts for the aerobic oxidation of alcohols in water
摘要:
Co-Pd bimetallic alloy nanoparticle catalysts were prepared from CoCl2, Pd(OAc)(2) and several capping agents with Li(C2H5)(3)BH. The nanoparticle catalysts were applied to the aerobic oxidation of a variety of alcohols in water to give the corresponding carbonyl products. The catalyst was magnetically recovered and reused for further oxidation. The nanoparticle catalysts were characterized with TEM, ICP, and XPS analyses. (C) 2014 Elsevier Ltd. All rights reserved.
α-Keto amide derivatives as enterovirus 71 (EV71) 3C protease (3Cpro) inhibitors have been synthesized and assayed for their biochemical and antiviral activities. structure–activity relationship (SAR) study indicated that small moieties were primarily tolerated at P1′ and the introduction of para-fluoro benzyl at P2 notably improved the potency of inhibitor. Inhibitors 8v, 8w and 8x exhibited satisfactory
Synthesis of diphenylamine macrocycles and their anti-inflammatory effects
作者:Alejandra Chávez-Riveros、Eduardo Hernández-Vázquez、Antonio Nieto-Camacho、Teresa Ramírez-Apan、Luis D. Miranda
DOI:10.1039/c8ob03121e
日期:——
A collection of fourteen diphenylamine macrocyclic derivatives containing a peptide chain with different substituents was synthesized using a protocol of two Ugi four component reactions (Ugi-4CR) and a Buchwald–Hartwig macrocyclization. Their anti-inflammatory effects were assayed with an ear edema model using 12-O-tetradecanoylphorbol-13-acetate, while the activity of myeloperoxidase was determined
Diversity-Oriented Synthesis of Highly Fluorescent Fused Isoquinolines for Specific Subcellular Localization
作者:Yoarhy A. Amador-Sánchez、Andrés Aguilar-Granda、Ricardo Flores-Cruz、Davir González-Calderón、Cynthia Orta、Braulio Rodríguez-Molina、Arturo Jiménez-Sánchez、Luis D. Miranda
DOI:10.1021/acs.joc.9b02712
日期:2020.1.17
The title compounds were prepared via a three-step protocol starting with an Ugi four-component reaction, followed by either an intramolecularalkynehydroarylation and subsequent alkene isomerization or through a Pomeranz-Fritsch-type cyclization with a final intramolecular Heck reaction. Subcellular localization studies of these compounds using green channel confocal microscopy revealed remarkable
Alkanethioimidoyl Radicals: Evaluation of β-Scission Rates and of Cyclization onto <i>S</i>-Alkenyl Substituents
作者:Matteo Minozzi、Daniele Nanni、John C. Walton
DOI:10.1021/jo0353637
日期:2004.3.1
Thioimidoyl radicals were generated by addition of alkylsulfanyl radicals to alkyl isonitriles and were characterized by electron paramagnetic resonance (EPR) spectroscopy. The β-scissions of their C•S−C bonds were studied by variable-temperature EPRspectroscopy and the fragmentation rate constants and activation energies were calculated. The scission rates depend on the stability of the released alkyl radicals
Combined Ugi-4CR/CuAAC Approach to Triazole-Based Neoglycolipids
作者:Karell Pérez-Labrada、Ignacio Brouard、Inmaculada Méndez、Carlos S. Pérez、José A. Gavín、Daniel G. Rivera
DOI:10.1002/ejoc.201402117
日期:2014.6
New glycolipids that feature a carbohydrate/triazole/lipid hybrid architecture were readily produced by a combined multicomponent/click approach. The process comprises the use of the Ugi four-component reaction to construct double-lipidic scaffolds that have either alkyne or azide functionalities followed by conjugation to mono- and trisaccharides through a CuI-catalyzed 1,3-dipolar cycloaddition (click)
具有碳水化合物/三唑/脂质混合结构的新糖脂很容易通过组合多组分/点击方法生产。该过程包括使用 Ugi 四组分反应构建具有炔烃或叠氮化物官能团的双脂支架,然后通过 CuI 催化的 1,3-偶极环加成(点击)过程与单糖和三糖结合。整个过程的高化学效率和可行性为这种独特的 Ugi/click 糖脂类库的快速创建和生物筛选提供了新的机会。进行动态核磁共振实验以评估与这些化合物中顺式/反式酰胺键的异构化相关的活化自由能。