2,4,6-三苯基-s-三嗪 (II) 是由 2,4,5-三苯基咪唑 (I) 在氧气和强碱存在下的化学发光反应或 I 在醇中的光解形成的氨和氧气的存在。II也在含氨的醇中在I的敏化光氧化中形成。发现由I制备的lophyl过氧化氢(V)(已知是I的化学发光反应的中间体之一)与氨反应产生II。化学和光谱证据表明 II 是由 V 产生的,而不是通过二氧杂环丁烷型过氧化物 (VI) 或 N,N'-二苯甲酰苯甲脒 (IV) 产生的。II 和其他几个 2,4,
Catalytic procedures for multicomponent synthesis of imidazoles: selectivity control during the competitive formation of tri- and tetrasubstituted imidazoles
作者:Dinesh Kumar、Damodara N. Kommi、Narendra Bollineni、Alpesh R. Patel、Asit K. Chakraborti
DOI:10.1039/c2gc35277j
日期:——
based ionic liquids (organic salts) were investigated for the three component reaction (3-MCR) of 1,2-diketone, aldehyde, and ammonium salts to form 2,4,5-trisubstituted imidazoles and the four component reaction (4-MCR) involving 1,2-diketone, aldehyde, amine and ammonium acetate to form 1,2,4,5-tetrasubstituted imidazoles. The HBF4–SiO2 was found to be the stand out catalyst for both the 3-MCR and
Direct synthesis of 2,4,5-trisubstituted imidazoles from primary alcohols by diruthenium(<scp>ii</scp>) catalysts under aerobic conditions
作者:Saranya Sundar、Ramesh Rengan
DOI:10.1039/c8ob02785d
日期:——
report a straightforward synthetic approach to 2,4,5-trisubstituted imidazoles from readily available primary alcohols using arene diruthenium(II) catalysts. Dinuclear arene ruthenium complexes have been synthesized and structurally characterized with the aid of analytical and spectral techniques. A library of 2,4,5-trisubstituted imidazoles was achieved with a yield up to 95% by loading 0.25 mol% of the
TMSOTf-catalyzed synthesis of trisubstituted imidazoles using hexamethyldisilazane as a nitrogen source under neat and microwave irradiation conditions
作者:Kesatebrhan Haile Asressu、Chieh-Kai Chan、Cheng-Chung Wang
DOI:10.1039/d1ra05802a
日期:——
In the process of drug discovery and development, an efficient and expedient synthetic method for imidazole-based small molecules from commercially available and cheap starting materials has great significance. Herein, we developed a TMSOTf-catalyzed synthesis of trisubstituted imidazoles through the reaction of 1,2-diketones and aldehydes using hexamethyldisilazane as a nitrogen source under microwave
在药物发现和开发过程中,一种高效便捷的以市售廉价起始原料合成咪唑基小分子的方法具有重要意义。在此,我们利用六甲基二硅氮烷作为氮源,在微波加热和无溶剂条件下,通过 1,2-二酮和醛的反应开发了 TMSOTf 催化合成三取代咪唑。使用 X 射线单晶衍射分析证实了代表性三取代咪唑的化学结构。这种合成方法有几个优点,包括温和的路易斯酸的参与,不含金属和添加剂,底物范围广,收率好至极好,反应时间短。此外,
ZrO<sub>2</sub>-β-cyclodextrin catalyzed synthesis of 2,4,5-trisubstituted imidazoles and 1,2-disubstituted benzimidazoles under solvent free conditions and evaluation of their antibacterial study
作者:Yarabhally R. Girish、Kothanahally S. Sharath Kumar、Kuntebommanahalli N. Thimmaiah、Kanchugarakoppal S. Rangappa、Sheena Shashikanth
DOI:10.1039/c5ra13891d
日期:——
A series of 2,4,5-trisubstituted imidazoles and 1,2-disubstituted benzimidazoles catalyzed by ZrO2-supported-β-cyclodextrin (ZrO2-β-CD) under solvent free conditions have been synthesized and characterized by spectral methods.
An eco-friendly, one pot synthesis of tri-substituted imidazoles in aqueous medium catalyzed by RGO supported Au nano-catalyst and computational studies
protocol for the synthesis of 2,4,5-trisubstituted imidazoles has been achieved with high substrate scope using supported Au nanoparticles. The catalyst can be recovered for the subsequent reactions and reused without any appreciable loss. The utility of this protocol was further explored to synthesis of fused and structurally versatile imidazole also. The synthetic attributes of imidazoles were also demonstrated
使用支持的 Au 纳米粒子在高底物范围内实现了一种生态相容、温和且操作简单的水相方案,用于合成 2,4,5-三取代咪唑。催化剂可以回收用于后续反应并重复使用,不会有任何明显的损失。该协议的效用也被进一步探索到合成融合和结构通用的咪唑。咪唑的合成属性也通过计算研究得到证明。此外,与早期的文献报道相比,低 E 因子和工艺质量强度使本方法更具可持续性。