Redox-Neutral Photocatalytic Radical Cascade Cyclization for the Synthesis of CH2CN/CF2COOEt/CF3-Containing Benzo[4,5]imidazo[2,1-a]isoquinolin-6(5H)-One Derivatives
摘要:
A novel method for the synthesis of benzo[4,5]imidazo[2,1-a]isoquinolin derivatives via visible-light-induced radical cascade cyclization is described. By using N-methacryloyl-2-phenylbenzoimidazoles and diverse radical precursors, various benzo[4,5]imidazo[2,1-a]isoquinolin derivatives containing CH2CN/CF2COOEt/CF3 can be formed in good to excellent yields under mild reaction conditions. This method exhibits good functional group tolerance and a wide range of substrate scope.
I2/TBHP promoted oxidative C–N bond formation at room temperature: Divergent access of 2-substituted benzimidazoles involving ring distortion
作者:Moumita Saha、Asish R. Das
DOI:10.1016/j.tetlet.2018.05.028
日期:2018.6
A new ‘one pot’ tandemsynthesis of 2-substituted benzimidazoles has been developed from 2-aminobenzyl alcohol/2-aminobenzamide and different coupling partners (nitriles, aldehydes and 1,3-diketones) via iodine and TBHP promoted oxidative ringcontraction. The present strategy involves sequential C–N bond formation, cyclization, subsequent ringcontraction and dehydrogenation to afford various medicinally
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 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。
Synthesis of new TCH/Ni‐based nanocomposite supported on SBA‐15 and its catalytic application for preparation of benzimidazole and perimidine derivatives
microscopy, atomic absorption spectroscopy and N2 adsorption–desorption (Brunauer–Emmett–Teller) techniques. The catalytic performance of Ni/TCH@SBA‐15 (NNTS‐15) was determined for the synthesis of 2‐aryl‐substituted benzimidazoles and 2,3‐dihydroperimidines. The excellent yields within shorter reaction times, simplicity of catalytic methods, non‐toxicity and clean reactions, mild reaction conditions and easy
Practical application of PhI(OAc)2/I2 combination to synthesize benzimidazoles from 2-aminobenzylamine through ring distortion strategy
作者:Moumita Saha、Prasun Mukherjee、Asish R. Das
DOI:10.1016/j.tetlet.2017.01.099
日期:2017.3
(PIDA)/iodine has been established as a promising reagent to promote the construction of 2-substituted benzimidazoles from 2-aminobenzylamine and a variety of easily available aldehydes/arylamines through a ring distortion strategy. The present protocol offers mild, metal free, robust conditions to synthesize 2-substituted benzimidazoles in good to excellent yields. In addition, the oxidation prone functional