Supercritical methanol as solvent and carbon source in the catalytic conversion of 1,2-diaminobenzenes and 2-nitroanilines to benzimidazoles
作者:Zhuohua Sun、Giovanni Bottari、Katalin Barta
DOI:10.1039/c5gc01040c
日期:——
Benzimidazoles and N-methylbenzimidazoles were synthesized by simply heating 1,2-diaminobenzenes in supercritical methanol over copper-doped porous metal oxides.
苯并咪唑和N-甲基苯并咪唑是通过在掺铜多孔金属氧化物中超临界甲醇中加热1,2-二氨基苯合成的。
1,2-Disubstituted Benzimidazoles by the Iron Catalyzed Cross-Dehydrogenative Coupling of Isomeric <i>o</i>-Phenylenediamine Substrates
作者:Pawan Thapa、Philip M. Palacios、Tam Tran、Brad S. Pierce、Frank W. Foss
DOI:10.1021/acs.joc.9b02714
日期:2020.2.21
Benzimidazoles are common in nature, medicines, and materials. Numerous strategies for preparing 2-arylbenzimidazoles exist. In this work, 1,2-disubstituted benzimidazoles were prepared from various mono- and disubstituted ortho-phenylenediamines (OPD) by iron-catalyzed oxidative coupling. Specifically, O2 and FeCl3·6H2O catalyzed the cross-dehydrogenative coupling and aromatization of diarylmethyl
An organoantimony nitrate complex with azastibocine framework as water tolerant Lewis acid catalyst for the synthesis of 1,2‐disubstitued benzimidazoles
techniques such as NMR spectra, TG‐DSC, and X‐ray diffraction. It was found that the complex 2 exhibits relatively strong Lewis acidity (3.3 < Ho ≤ 4.8) and could be employed as a water tolerant Lewisacid catalyst for the synthesis of synthetically valuable benzimidazole derivatives starting from aldehydes and arylenediamines. This catalytic system shows excellent tolerance toward a wide variety of functional
Nano indium oxide: an efficient catalyst for the synthesis of 1,2-disubstituted benzimidazoles in aqueous media
作者:Sougata Santra、Adinath Majee、Alakananda Hajra
DOI:10.1016/j.tetlet.2012.02.021
日期:2012.4
Synthesis of 1,2-disubstitutedbenzimidazoles has been developed by the condensation of diamine with aldehydes using nano In2O3 as an efficient catalyst under mild reaction conditions in aqueous media. The procedure is applicable to aryl, aliphatic, heteroaryl aldehydes. In2O3 nanoparticles are recyclable without the loss of significant catalytic activity.
通过在水介质中温和的反应条件下,使用纳米In 2 O 3作为有效的催化剂,通过二胺与醛的缩合反应,开发了1,2-二取代的苯并咪唑的合成方法。该方法适用于芳基,脂族,杂芳基醛。In 2 O 3中的纳米颗粒是可回收的,而不会损失明显的催化活性。
Air-stable Organobismuth(V) Bisperfluorooctanesulfonate as an Efficient Catalyst for the Synthesis of N-Containing Compounds
Triphenyl bismuth bisperfluorooctanesulfonate is an air‐ and water‐stable Lewis acid. It exhibits high catalytic efficiency for the synthesis of nitrogen heterocycles such as diindolylmethane derivatives, dihydropyrimidinones, dihydropyridines and 1,2‐disubstitued benzimidazoles under mild condition. Furthermore, it can be reused without loss of activity in a test of five cycles.This catalytic system