在这项研究中,已将固定在Fe 3 O 4纳米颗粒(Fe 3 O 4 @SiO 2 / PEtOx)上的聚(2-乙基-2-恶唑啉)(PEtOx)构造为一种新型,多相,高效且可回收的纳米催化剂。制备的纳米催化剂通过傅里叶变换红外(FTIR),扫描电子显微镜(SEM),粉末X射线衍射(XRD),能量色散X射线光谱(EDS)分析和振动样品磁强计(VSM)技术进行表征。纳米催化剂被用来合成苯并[ b ]氧杂蒽酮和四氢色素[2,3- b氧杂蒽四酮通过在以下条件下的2-羟基-1,4-萘醌或2,5-二羟基-1,4-苯醌,醛和二甲酮或1,3-环己二酮之间的一锅三或假五组分反应在乙醇中的回流条件。该催化剂可以容易地分离并循环使用几次,而活性没有明显损失。清洁的方法,容易的后处理,温和的反应条件,较短的反应时间和良好至优异的收率,以及催化剂的简单制备是所提出的工作的一些优点。
Application of cobalt phthalocyanine as a nanostructured catalyst in the synthesis of biological henna-based compounds
作者:Mohammad Dashteh、Maliheh Safaiee、Saeed Baghery、Mohammad Ali Zolfigol
DOI:10.1002/aoc.4690
日期:2019.4
The present investigation describes synthesis of a good range of henna‐based compounds in the presence of novel nano cobaltphthalocyanine like molten salt (tetra‐2,3‐pyridiniumporphyrazinato cobalt tribromomethanide) [Co (TPPABr)]CBr3 as an efficient, recyclable and thermally stable heterogeneous catalyst.
“On-water” organic synthesis: l-proline catalyzed synthesis of pyrimidine-2,4-dione-, benzo[g]- and dihydropyrano[2,3-g]chromene derivatives in aqueous media
In this work, functionalized pyrimidine-2,4-dione-, benzo[g]-, and dihydropyrano[2,3-g]chromene derivatives have been synthesized via a Michael addition of 2-hydroxy-1,4-naphthoquinone or 2,5-dihydroxy-1,4-benzoquinone to the Knoevenagel condensation product of an aldehyde with Meldrum’s acid, dimedone or barbituric acid in the presence of a catalytic amount of l-proline under refluxing conditions
在这项工作中,通过2-羟基-1,4-萘醌或2的迈克尔加成反应合成了功能化的嘧啶-2,4-二酮-,苯并[ g ]-和二氢吡喃并[2,3- g ]色烯衍生物。在催化量的1-脯氨酸存在下,在水中回流条件下,将醛,5-二羟基-1,4-苯醌与醛与梅德鲁姆的酸,二甲酮或巴比妥酸形成Knoevenagel缩合产物,收率良好。
An Efficient Strategy for the Synthesis of Naphtho[2,3-b][1,6]naphthyridines Promoted by Acetic Acid
作者:Furen Zhang、Zhenlu Shen、Chunmei Li
DOI:10.1055/a-1479-4420
日期:2021.7
A three-component domino reaction for the synthesis of naphtho[2,3-b][1,6]naphthyridine derivatives has been established. Such strategy exhibited excellent substrate scope including various enaminones and aldehydes that afforded a series of multifunctionalized naphtho[2,3-b][1,6]naphthyridine derivatives with 70–86% yields. The advantages of bond-forming efficiency, accessibility of starting materials
Brønsted acidic ionic liquids catalyzed the preparation of 13-aryl-5H-dibenzo[b,i]xanthene-5,7,12,14(13H)-tetraones and 3,4-dihydro-1H-benzo[b]xanthene-1,6,11(2H,12H)-triones
An environmentally green method for the synthesis of 13-aryl-5H-dibenzo[b,i]xanthene-5,7,12,14(13H)-tetraone and 3,4-dihydro-1H-benzo[b]xanthene-1,6,11(2H,12H)-trione derivatives using Brønsted acidic ionic liquids, 3-methyl-1-sulfonic acid imidazolium chloride, 1-H-3-methyl-imidazolium hydrogensulfate, triethylamine-bonded sulfonic acid, and triethylammonium hydrogensulfate as reusable catalysts under thermal solvent-free conditions is described.
Phosphoric acid supported on alumina (H3PO4/Al2O3) is an efficient catalyst for the catalytic multi-component condensation reaction and a wide variety of syntheses of benzoxanthene pigments in good yields. The remarkable features of this new procedure are high conversions, shorter reaction times, cleaner reaction, and simple experimental and work-up procedures.