Butane-1-sulfonic acid immobilized on magnetic Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>nanoparticles: A novel and heterogeneous catalyst for the one-pot synthesis of barbituric acid and pyrano[2,3-<i>d</i>] pyrimidine derivatives in aqueous media
reagent was characterized and used for the efficient promotion of the synthesis of barbituric acid and pyrano[2,3‐d] pyrimidine derivatives. All reactions were performed under mild and completely heterogeneous reaction conditions affording products in good to high yields. The catalyst is easily isolated from the reaction mixture by magnetic decantation and can be reused at least eight times without
固定在磁性Fe 3 O 4 @SiO 2纳米粒子(Fe 3 O 4 @SiO 2-磺内酯)上的丁烷-1-磺酸易于通过纳米磁性Fe 3 O 4 @SiO 2的1,4-丁磺酸内酯的直接开环制备。。表征所制备的试剂,并将其用于有效促进巴比妥酸和吡喃并[2,3- d]嘧啶衍生物。所有反应均在温和且完全不均一的反应条件下进行,从而提供高至高收率的产物。通过磁倾析法可以很容易地将催化剂从反应混合物中分离出来,并且可以重复使用至少八次,而不会明显降低活性。
The introduction of two new imidazole-based bis-dicationic Brönsted acidic ionic liquids and comparison of their catalytic activity in the synthesis of barbituric acid derivatives
sulfate and bis-imidazolium perchlorate as two new bis-dicationic Brönsted acidic ionic liquids based on imidazole is reported. After characterization by FT-IR, mass and NMR spectroscopy and pH titration, the applicability of these reagents is studied in the promotion of the synthesis of 5-arylidene barbituricacids and pyrano[2,3-d] pyrimidinone derivatives. These methods possess some advantages such
在本文中,报道了制备双咪唑硫酸氢盐和双咪唑高氯酸盐作为两种新的基于咪唑的双阳离子布朗斯台德酸性离子液体。通过FT-IR,质谱,NMR光谱和pH滴定法进行表征后,研究了这些试剂在促进5-亚芳基巴比妥酸和吡喃并[2,3- d ]嘧啶酮衍生物的合成中的适用性。这些方法具有一些优点,例如易于制备催化剂,简单的后处理步骤,短的反应时间,优异的产率以及在反应的所有步骤中使用非有机溶剂以及催化剂的良好可重复使用性。
SCMNPs@Urea/Py-CuCl<sub>2</sub>: a recyclable catalyst for the synthesis of pyrano[2,3-<i>d</i>]pyrimidinone and pyrano[2,3-<i>d</i>] pyrimidine-2,4,7-trione derivatives
作者:Jun Zhang、Hongqing Song、Ruirui Cui、Chaoyong Deng、Qahtan A. Yousif
DOI:10.1080/00958972.2020.1737681
日期:2020.2.16
Abstract An efficient, simple, and mild strategy for the one-pot multicomponent synthesis of pyrano[2,3-d]pyrimidinone and pyrano[2,3-d]pyrimidine-2,4,7-trione derivatives is described using SCMNPs@Urea/Py-CuCl2 nanoparticles as a reusable heterogeneous magnetic nanocatalyst. The catalyst was characterized using Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), vibrating
Three-component synthesis of pyrano[2,3-d]pyrimidinone derivatives catalyzed by Ni2+ supported on hydroxyapatite-core–shell-γ-Fe2O3 nanoparticles in aqueous medium
via one-pot, three-component condensation reaction of aromatic aldehydes, malononitrile, and barbituric acid in aqueous ethanol catalyzed by Ni2+ supported on hydroxyapatite-core–shell-γ-Fe2O3 nanoparticles (γ-Fe2O3@HAp-Ni2+ NPs) as Lewis acid. The nontoxic nature and easy handling of the catalyst, environmentally friendly and facile work-up procedure, short reaction time, lowcatalystloading, and
Nano-Zn[2-boromophenylsalicylaldiminemethylpyranopyrazole]Cl<sub>2</sub>as a novel nanostructured Schiff base complex and catalyst for the synthesis of pyrano[2,3-<i>d</i>]pyrimidinedione derivatives
several techniques. Nano‐[Zn‐2BSMP]Cl2 was used as an effective catalyst for the preparation of some pyrano[2,3‐d]pyrimidinedione derivatives by the multicomponent reaction of malononitrile, aryl aldehydes and barbituric acid derivatives. The novelty and efficiency of nano‐[Zn‐2BSMP]Cl2 as a catalyst, in comparison with some other reported catalysts, for this synthetic transformation are the main features