Chemoselective reduction of nitroaromatics using recyclable alumina-supported nickel nanoparticles in aqueous medium—exploration to one pot synthesis of benzimidazoles
作者:Avishek Ghatak、Sanjay Bhar
DOI:10.1080/00397911.2021.2024853
日期:2022.2.1
protocol for chemoselective and regioselective reduction of nitroaromatics in water has been achieved using easily accessible alumina-supported nickel nanoparticles as a stable recyclable heterogeneous catalyst. Various sensitive substituents like allyloxy, benzyloxy, t-butyldimethylsilyloxy, hydroxymethyl, alkoxycarbonyl, formyl, keto, carboxylic acid, chloro, bromo, azo and cyano were tolerated in
A simple and straightforward synthesis of substituted 2-arylbenzimidazoles over silica gel
作者:Amit K. Chaturvedi、Arvind S. Negi、Puja Khare
DOI:10.1039/c3ra22435j
日期:——
A solid phase strategy for the synthesis of substituted 2-arylbenzimidazoles oversilicagel has been achieved starting from their corresponding o-phenylenediamines 1 and aromatic aldehydes 2. The reaction is very simple, convenient and straightforward, and the products are obtained in moderate to high yields (49–91%).
Practical, Ecofriendly, and Chemoselective Method for the Synthesis of 2-Aryl-1-arylmethyl-1<i>H</i>-benzimidazoles Using Amberlite IR-120 as a Reusable Heterogeneous Catalyst in Aqueous Media
作者:Saikat Das Sharma、Dilip Konwar
DOI:10.1080/00397910802448440
日期:2009.2.25
environmentally benign method has been developed for the exclusive formation of biologically significant 2-aryl-1-arylmethyl-1H-benzimidazoles under the heterogeneous catalysis of Amberlite IR-120 in aqueousmedia in excellent yields. The catalyst is recyclable without loss of activity.
AbstractAn efficient and simple procedure was developed for the green synthesis of various 2‐aryl‐1‐ben‐zylated‐1H‐benzimidazoles in high yields by condensation of o‐phenylenediamine with aldehydes with P2O5/SiO2 as catalyst under solvent‐free and ambient conditions.
MWCNTs‐ZrO
<sub>2</sub>
as a reusable heterogeneous catalyst for the synthesis of
<i>N</i>
‐heterocyclic scaffolds under green reaction medium
作者:Bipasa Halder、Flora Banerjee、Ahindra Nag
DOI:10.1002/aoc.5906
日期:2020.11
scanning electron microscopy, and X‐ray photoelectron spectroscopy analysis. The heterogeneous nanocomposite has been used for one‐potsynthesis of various N‐heterocyclic compounds like pyrazoles, 1,2‐disubstituted benzimidazoles, 2‐arylbenzazoles, and 2,3‐dihydroquinazolin‐4(1H)‐ones under green reaction medium at room temperature. This novel method has several advantages, such as short reaction time, simple