的Fe 3 ö 4 @silica硫酸纳米颗粒:一种有效的可重复使用的纳米磁性催化剂作为有效的固体酸为吲唑并[2,1-的一锅无溶剂合成b ]酞嗪三酮和吡唑并[1,2- b ] phthalazine-二酮
摘要:
关于绿色化学的目标,二氧化硅涂覆的磁铁矿纳米颗粒(MNP)开辟了新途径,以引入令人惊叹且高效的系统,以促进不同有机反应中催化剂的回收。因此,本文提出了使用Fe 3 O 4制备具有核-壳结构(Fe 3 O 4 @二氧化硅硫酸)的硫酸功能化二氧化硅包覆的磁铁矿纳米粒子。球体为核心,二氧化硅硫酸纳米粒子为壳。通过红外光谱(FT-IR),扫描电子显微镜(SEM),透射电子显微镜(TEM),X射线衍射(XRD)光谱和振动样品磁力计(VSM)对催化剂进行了表征。还描述了该纳米磁性固体酸催化剂在邻苯二甲酰肼,芳族醛与环状或非环状的1,3-二酮的单锅三组分缩合反应中的能力。易用的反应条件,高催化活性和良好的可重复使用性以及简单的磁性后处理使得该方法成为经济合成吲唑并[ 2,1 - b ]酞嗪-三酮和吡唑并[1,]的有趣选择。2 - b ]酞嗪二酮。
Solvent-free, sonochemical, one-pot, four-component synthesis of 2H-indazolo[2,1-b]phthalazine-triones and 1H-pyrazolo[1,2-b]phthalazine-diones catalyzed by Fe3O4@SiO2-imid-PMAn magnetic nanoparticles
A practical and green method for the synthesis of 2H-indazolo[2,1-b]phthalazine-triones and 1H-pyrazolo[1,2-b]phthalazine-diones using Fe3O4@SiO2-imid-PMAn nanoparticles as an eco-friendly magnetic catalyst from the four-component condensation, solvent-free reaction of phthalic anhydride, hydrazinium hydroxide, 1,3-diketones, and aldehydes under thermal or ultrasound irradiation at room temperature
一种使用 Fe 3 O 4 @SiO 2 -imid-PMA合成 2 H -吲唑并[2,1- b ]酞嗪三酮和 1 H -吡唑并[1,2- b ]酞嗪二酮的实用绿色方法n描述了纳米粒子作为一种环保磁性催化剂,来自邻苯二甲酸酐、氢氧化肼、1,3-二酮和醛的四组分缩合、无溶剂反应,在室温下进行热或超声辐照。这种新方法具有显着的优点,例如操作简单、产率高、反应时间短以及没有任何繁琐的后处理或纯化。此外,催化剂的热稳定性、易于制备和分离使其成为一种良好的多相体系,是其他多相催化剂的有用替代品。此外,催化剂可以很容易地通过磁场回收并重复使用八个连续的反应循环而不会显着损失活性。
Synthesis of phthalazine compounds using heterogeneous base catalyst based on silica nanoparticles obtained from rice husk
of this nanocomposite for the preparation of phthalazine-trione and phthalazine-dione derivatives is surprising under reflux conditions via the one-pot three-component condensation reaction of phthalhydrazide, aromatic aldehydes, and diketones. This green catalyst is easily recovered and re-utilized for the next reaction at least four runs without having any considerable influence on the yields. This
A new efficient domino approach for the synthesis of pyrazolyl-phthalazine-diones. Antiradical activity of novel phenolic products
作者:Dušica Simijonović、Zorica D. Petrović、Vesna M. Milovanović、Vladimir P. Petrović、Goran A. Bogdanović
DOI:10.1039/c8ra02702a
日期:——
dissociation and proton abstraction energies) specify SPLET as a prevailing radical scavenging mechanism in polar solvents, and HAT in solvents with lower polarity. On the other hand, the obtained reaction enthalpies for inactivation of free radicals suggest competition between HAT and SPLET mechanisms, except in the case of the ˙OH radical in polar solvents, where HAT is labeled as prefered.
在离子液体催化的乙酰丙酮、2,3-二氢酞嗪-1,4-二酮和不同醛的一锅多组分反应中以中等至良好的收率合成了吡唑基-酞嗪-二酮衍生物 ( PPD )。获得了6个新的PPDs,2-乙酰基-1-(4-氟苯基)-3-甲基-1H-吡唑并[1,2 - b ]酞嗪-5,10-二酮( PPD-4 )的晶体结构被确定了。新型PPD-4最有趣的结构特征是在一个分子的 F 原子和相邻的六元杂环的中点之间形成相当短的分子间距离。这种相互作用将所有分子排列成平行的超分子链。获得所有PPD的UV-Vis 光谱,并与使用 TD-DFT 获得的模拟光谱进行比较。使用稳定的 DPPH 自由基对所有合成的化合物进行体外抗氧化活性评估。结果表明,具有儿茶酚动机的PPD-7是最活跃的抗氧化剂,而PPD-9,与酚 OH 相邻的两个甲氧基,发挥了稍低但显着的抗氧化潜力。DFT热力学研究结果与PPD-7和PPD-9应被视为强大的自由基
Synthesis and characterization of a porous acidic catalyst functionalized with an imidazole ionic liquid, and its use for synthesis of phthalazinedione and phthalazinetrione heterocyclic compounds
作者:Jamal Davarpanah、Parizad Rezaee、Somayeh Elahi
DOI:10.1007/s11164-015-1997-2
日期:2015.12
A simple and convenient method has been used to prepare an [SBA-Im]HSO4 composite on SBA-15 mesoporous silica as support. The surface of the mesoporous silica was modified by reaction with the ionic liquid 1-(triethoxysilylpropyl)-3-methylimidazolium hydrogen sulfate (IL-HSO4). The resulting solid acid was characterized by infrared spectroscopy (FTIR), transmission and scanning electron microscopy
Abstract A simple, efficient, and high yielding one-pot protocol for the synthesis of 2H-indazolo[2,1-b]phthalazine-trione derivatives has been developed by three-component coupling of phthalhydrazide, dimedone and some aromatic aldehydes in ecofriendly neat conditions promoted by nano-γ-alumina sulforic acid. This protocol avoids the use of expensive catalysts, toxic solvents and chromatographic separation
摘要 通过邻苯二甲酰肼、二甲酮和一些芳香醛的三组分偶联,在生态友好的纯净环境中,开发了一种简单、高效、高产的一锅法合成 2H-吲唑并 [2,1-b] 酞嗪三酮衍生物。纳米γ-氧化铝硫酸促进的条件。该协议避免使用昂贵的催化剂、有毒溶剂和色谱分离。此外,拟议的协议扩展到线性 β-二酮(乙酰丙酮)而不是环状二酮(二甲酮)。证明了这种收敛且环境友好的方法的通用性和功能耐受性。该缩合反应的建议机制的每个步骤的性质也可以通过使用 B3LYP/6-31G ** 理论水平的密度泛函理论 (DFT) 计算来确定。结果表明,第一步是电荷控制;而第二个由前沿分子轨道控制。还计算了 1 H 和 13 C 化学位移值以及标题化合物的结构参数,并将缩放值与相应的实验 NMR 和 X 射线光谱进行了比较。因此,计算的光谱数据和优化的几何形状与实验结果非常吻合。