在这里,我们公开了一种新的铜( I )-席夫碱络合物系列,用于在良性条件下将伯醇选择性氧化为醛。催化方案涉及 2,2,6,6-四甲基哌啶-N-氧基 (TEMPO)、N-甲基咪唑 (NMI)、环境空气、乙腈和室温。该系统为一系列希夫碱提供了直接而快速的途径,特别是带有取代的(呋喃-2-基)亚胺碱N- (4-氟苯基)-1-(呋喃-2-)的铜( I )配合物基)甲亚胺(L2)和N-(2-氟-4-硝基苯基)-1-(呋喃-2-基)甲亚胺(L4)显示出优异的产率。苯甲醇和脂肪醇都选择性地转化为醛,产率分别为 99%(1-2 小时)和 96%(16 小时)。通过所有组分的动力学分析进行的机理研究表明,配体类型在反应速率中起着关键作用。配体的碱性增加了金属中心的电子密度,从而导致更高的氧化反应性。哈米特图显示关键步骤不涉及 H 抽象。此外,广义加性模型(GAM,包括随机效应)表明可以将反应组成与催化活性、
quantitative yields in the oxidations of benzyl alcohol (99% yield in 1 h) and 1-octanol (96% yield in 24 h). Based on the X-ray structure determination, the complex has a square pyramidal coordination accomplished by two L2 ligands and bromide as a counter anion. The oxidation reactions were monitored with UV–vis and in situ ATR-IR spectroscopy to study the changes in the catalytic structure and to elucidate
Silver-Catalyzed Three-Component Approach to Quinolines Starting from Anilines, Aldehydes, and Alcohols
作者:Xu Zhang、Zhiqiang Wang、Wenmin Liu、Ruixue Sun、Xuefeng Xu、Yanlei Yan
DOI:10.1055/s-0035-1561916
日期:——
A silver-catalyzed sequential formation of two C–C bonds for the construction of a series of polysubstituted quinolines from anilines, aldehydes, and alcohols under mild conditions has been developed. The transformation is effective for a broad range of substrates, including aliphatic alcohols, arylalkanols, cycloalkanols, and ethylene glycol, thereby permitting the expansion of the constituent architectures
Ru‐Catalyzed Carbonylative Murai Reaction: Directed C3‐Acylation of Biomass‐Derived 2‐Formyl Heteroaromatics
作者:Roberto Sala、Fares Roudesly、Luis F. Veiros、Gianluigi Broggini、Julie Oble、Giovanni Poli
DOI:10.1002/adsc.202000249
日期:2020.6.15
here the carbonylative version applied to 2‐formylfurans, 2‐formylpyrrols and 2‐formylthiophenes. This acylation reaction takes place regioselectively at C3 position of the heterocyclopentadienes thanks to the installation of removable imine directing groups. The transformation can be achieved by treating the two reaction partners with a catalytic amount of Ru3(CO)12, in toluene at 120–150 °C, after CO
New synthetic approach to epoxyisoindolo[2,1-a]quinolines based on cycloaddition reactions of 2-furyl-substituted tetrahydroquinolines with maleic anhydride and acryloyl chloride
作者:F. I. Zubkov、V. P. Zaitsev、A. S. Peregudov、N. M. Mikhailova、A. V. Varlamov
DOI:10.1007/s11172-007-0159-0
日期:2007.5
A procedure was developed for the synthesis of hydrogenated furyl-substituted furo[3,2-c]quinolines, pyrano[3,2-c]quinolines, and 4-ethoxy-and 4-(2-oxopyrrolidin-1-yl)quinolines. The reactions of these compounds with acryloyl chloride and maleic anhydride produce epoxyisoindolo[2,1-a]quinoline derivatives through successive acylation at the quinoline nitrogen atom and intramolecular exo-[4+2]-cycloaddition at the furan moiety.
A silver-catalyzed formation of C-C bond for the construction of a series of polysubstituted quinolines from arylamines, aldehydes, and ketones or arylamines and 1,3-diketones has been developed. The transformation is effective for a broad range of substrates, thus enabling the expansion of constituent architectures on the heterocyclic framework. This use of a single catalytic system to mediate chemical transformations in a synthetic operation is important for the development of new atom-economic strategies and this strategy is efficient in building complex structures from simple starting materials in an environmentally benign fashion. (C) 2015 Elsevier Ltd. All rights reserved.