The Synthesis of Benzimidazoles and Quinoxalines from Aromatic Diamines and Alcohols by Iridium-Catalyzed Acceptorless Dehydrogenative Alkylation
作者:Toni Hille、Torsten Irrgang、Rhett Kempe
DOI:10.1002/chem.201400400
日期:2014.5.5
N‐heteroaromatics with many applications in pharmaceutical and chemical industry. Here, the synthesis of both classes of compounds starting from aromatic diamines and alcohols (benzimidazoles) or diols (quinoxalines) is reported. The reactions proceed through acceptorless dehydrogenative condensation steps. Water and two equivalents of hydrogen are liberated in the course of the reactions. An Ir complex stabilized
苯并咪唑和喹喔啉是重要的N-杂芳族化合物,在制药和化学工业中有许多应用。在此,报道了从芳族二胺和醇(苯并咪唑)或二醇(喹喔啉)开始的两类化合物的合成。反应通过无受体的脱氢缩合步骤进行。在反应过程中释放出水和两当量的氢。由三齿P ^ N ^ P配体N 2,N 6-双(二异丙基膦基)吡啶-2,6-二胺稳定的Ir配合物显示出两个反应的最高催化活性。
Direct Synthesis of Benzimidazoles by Dehydrogenative Coupling of Aromatic Diamines and Alcohols Catalyzed by Cobalt
Herein, we present the base-metal-catalyzed dehydrogenativecoupling of primary alcohols and aromatic diamines to selectively form functionalized 2-substituted benzimidazoles, liberating water and hydrogen gas as the sole byproducts. The reaction is catalyzed by pincer complexes of Earth-abundant cobalt under base-free conditions.
Rare-Earth Metal Chlorides as Efficient Catalysts for the Simple and Green Synthesis of 1,2-Disubstituted Benzimidazoles and 2-Substituted Benzothiazoles Under Ultrasound Irradiation
作者:Li-Jun Zhang、Jing Xia、Yong-Qing Zhou、Hua Wang、Shao-Wu Wang
DOI:10.1080/00397911.2010.524337
日期:2012.2.1
Abstract Under solvent-free and ultrasonic irradiation conditions, efficient methods for the synthesis of 1,2-disubstitued benzimidazoles and 2-substitued benzothiazoles by employing rare-earth metal chlorides as catalysts are described. The methods have the advantages of broad generality, economical catalysts, good yields, simple operation, solvent-free condition, and ambient temperature. GRAPHICAL
A pentanuclear Er (III) coordination cluster as a catalyst for selective synthesis of 1,2‐disubstituted benzimidazoles
作者:Arijit Sarkar、Sourav Jana、Hari Pada Nayek
DOI:10.1002/aoc.6200
日期:2021.6
acetylacetone were treated with Er (NO3)3·5H2O, which resulted in the formation of a pentanuclear coordination cluster [Er5(LH)4(acac)4(μ3‐O)(μ3‐OH)(H2O)2].5H2O (1) (acac = acetylacetonate). Five Er (III) ions are arranged in a nonlinear fashion in 1. Complex 1 was utilized as a catalyst towards the selective synthesis of 1,2‐disubstituted benzimidazole derivatives involving o‐phenylenediamine and different
Mukaiyama reagent: An efficient reaction mediator for rapid synthesis of 1,2-disubstituted-1H-benzo[d]imidazoles
作者:Graziella Tocco、Antonio Laus、Pierluigi Caboni
DOI:10.1016/j.tetlet.2022.154045
日期:2022.8
chemistry, 1,2-disubstituted benzimidazoles represent a privileged class of nitrogen-based heterocycles but, unlike 2-substitued derivatives, few synthetic methods have been reported. In this context, we developed a rapid, metal-free, and straightforward method to prepare a series of 1,2-disubstituted-1H-benzo[d]imidazoles starting from 1,2-phenylendiamines and various aromatic and aliphatic aldehydes in the
在药物化学领域,1,2-二取代苯并咪唑代表了一类特殊的氮基杂环化合物,但与 2-取代衍生物不同,很少有合成方法的报道。在此背景下,我们开发了一种快速、无金属且直接的方法,以1,2-苯二胺和各种芳香族和脂肪族醛为原料制备一系列 1,2-二取代-1 H-苯并[ d ]咪唑。向山试剂的存在。反应在室温下在几分钟内进行,产物收率良好。