Synthesis and Structural Characterization of 2-(Hydroxyethoxy Substituted)phenyl Benzimidazoles
摘要:
本文以邻苯二胺、羟基取代的苯甲醛和氯海德林为起始原料,通过两种不同的路线合成了四种 2-(羟乙氧基取代)苯基苯并咪唑。在路线 I 中,羟乙基取代的苯甲醛首先与邻苯基苯二胺反应,得到 2-(羟乙基取代)苯基苯并咪唑中间体,然后利用这些中间体与氯醇进行邻羟乙基化反应合成最终产物。在路线 II 中,首先通过邻羟乙基反应合成羟乙基取代的苯甲醛,然后与邻苯二胺反应。结果表明,路线 I 只适用于羟乙氧基位于苯环中苯并咪唑的对位和元位的目标化合物。对于 2-(邻羟乙氧基)苯基苯并咪唑的合成,路线 II 是唯一的选择,因为它具有很强的立体阻碍。通过元素分析、红外光谱、1H NMR、13C NMR 和单晶 X 射线衍射分析,对这四种新化合物的结构进行了表征和确认。
Magnetic nanoparticle-supported DABCO tribromide: a versatile nanocatalyst for the synthesis of quinazolinones and benzimidazoles and protection/deprotection of hydroxyl groups
supported on magnetic Fe3O4 nanoparticles (MNPs-DABCO tribromide) as a novel heterogeneous tribromide type compound was found to be an efficient and reusable nanocatalyst for the one-pot synthesis of 2-arylquinazolin-4(3H)-ones and 2-aryl-1H-benzo[d]imidazoles through oxidative cyclization of aldehydes with 2-aminobenzamides and 1,2-phenylenediamine, respectively. Also, MNPs-DABCO tribromide catalyzed tr
发现一种新型的非均相三溴化物类型化合物,负载在磁性Fe 3 O 4纳米颗粒上的1,4-二氮杂双环[2.2.2]辛烷三溴化物(MNPs-DABCO三溴化物)是一种高效且可重复使用的纳米催化剂,可用于一锅法合成2通过分别用2-氨基苯甲酰胺和1,2-苯二胺对醛进行氧化环化反应,制得-芳基喹唑啉-4(3 H)-ones和2-芳基-1 H-苯并[ d ]咪唑。而且,MNPs-DABCO三溴化物通过在室温下改变溶剂介质,催化了多种醇和酚的三甲基甲硅烷基化/四氢吡喃基化和甲硅烷基化/脱吡喃基化。
A ball-milling strategy for the synthesis of benzothiazole, benzimidazole and benzoxazole derivatives under solvent-free conditions
作者:Hemant Sharma、Narinder Singh、Doo Ok Jang
DOI:10.1039/c4gc01142b
日期:——
A convenient solvent-free method for the synthesis of benzothiazole, benzimidazole, and benzoxazole derivatives has been developed using recyclable ZnO-NPs via a ball-milling strategy. The method affords environmentally friendly reaction conditions that score high on the ecoscale with the low E-factor. The process is also highly efficient even on a multi-gram scale and provides easy product isolation
A Simple, Mild and Efficient One-Pot Synthesis of 2-Substituted Benzimidazoles in the Presence of H2O2/HCl under Microwave Irradiation
作者:Hossein Naeimi、Nasrin Alishahi
DOI:10.1002/jccs.201100591
日期:2012.8
A simple, fast and efficient method for the preparation of several 2‐substituted benzimidazole derivatives is reported. Compounds were synthesized through a rapid one‐pot synthesis via microwaveirradiation, starting from aldehydes and o‐phenylenediamine, in the presence of H2O2/HCl system in acetonitrile. The significant features of this method are short reaction times, high yields, easy and quick
报道了一种简单,快速,有效的方法,用于制备几种2-取代的苯并咪唑衍生物。在乙腈中存在H 2 O 2 / HCl系统的情况下,由醛和邻苯二胺开始,通过微波辐射通过快速一锅法合成化合物。该方法的显着特点是反应时间短,收率高,产物容易,快速分离。
Conventional and Microwave-Assisted Synthesis of Benzimidazole Derivatives and Their<i>In Vitro</i>Inhibition of Human Cyclooxygenase
作者:Daniela Secci、Adriana Bolasco、Melissa D'Ascenzio、Flavio della Sala、Matilde Yáñez、Simone Carradori
DOI:10.1002/jhet.1058
日期:2012.9
A large series of 1,2‐diaryl‐benzimidazole and 2‐aryl‐1H‐benzimidazolederivatives were synthesized with slight differences using both microwave irradiation and conventional heating methods. Usually higher yields and time reactions reduction were obtained with the former method. All compounds were assayed for their in vitro ability to inhibit humancyclooxygenases, and most of them showed an encouraging
KF/Al2O3: an efficient solid heterogeneous base catalyst in one-pot synthesis of benzimidazoles and bis-benzimidazoles at room temperature
作者:Saeed Bahadori Khalili、Ali Reza Sardarian
DOI:10.1007/s00706-011-0647-7
日期:2012.5
AbstractKF/Al2O3 is an efficient solid heterogeneous base catalyst in the one-pot synthesis of 2-substitutedbenzimidazoles and 2,2′-disubstituted bis-benzimidazoles from 1,2-phenylenediamines or 3,3′-diaminobenzidines and acid chlorides, anhydrides, and esters at room temperature. Graphical abstract
摘要KF / Al 2 O 3是一种有效的固体非均相碱催化剂,可用于由1,2-苯二胺或3,3'-二氨基联苯胺和酰氯一锅法合成2-取代的苯并咪唑和2,2'-二取代的双-苯并咪唑,酸酐和酯在室温下。 图形概要