ONE-POT SYNTHESIS OF POLYSUBSTITUTED IMIDAZOLES FROM ARYLALDEHYDES IN WATER CATALYZED BY NHC USING MICROWAVE IRRADIATION
摘要:
A simple, high yielding synthesis of tri (3a-i) and tetrasubstituted (4a-g) imidazols from aldehydes is described. The cornerstone of this methodology involves the condensation of NH4OAc, substituted aldehydes, and benzoin, which is synthesized in situ from aldehydes catalyzed by N-heterocyclic carbine (NHC), under microwave irradiation in water to afford trisubstituted imidazoles (3a-i). If arylamine is added in the solution, tetrasubstituted imidazoles (4a-g) can be obtained. Lepidilines B and trifenagrel are also synthesized in high yield using this procedure. All the experiment deta are in agreement with the literature.
Benzimidazolium salts prevent and disrupt methicillin-resistant <i>Staphylococcus aureus</i> biofilms
作者:Jérémie Tessier、Andreea R. Schmitzer
DOI:10.1039/d0ra00738b
日期:——
resistance they acquire. One of the defense mechanisms of resistant bacteria is the formation of biofilms. Herein we show that benzimidazoliumsalts with various flexible or rigid side chains act as strong antibiotic and antibiofilm agents. We show that their antibiofilmactivity is due to their capacity to destroy the biofilm matrix and the bacterial cellular membranes. These compounds are able to avoid
Dose-, time-and lipophilicity-dependent silver(I)-N-heterocyclic carbene complexes: Synthesis, characterization and interaction with plasmid and <i>Aedes albopictus</i>
DNA
作者:Patrick O. Asekunowo、Rosenani A. Haque、Mohd.R. Razali、Silas W. Avicor、Mustafa F.F. Wajidi
DOI:10.1002/aoc.3655
日期:2017.7
new Ag(I)–N‐heterocyclic carbene (NHC) complexes (5–8) bearing symmetrically substituted NHC ligands have been synthesized starting from the corresponding benzimidazolium bromide salts which are accessible in a single step fromN‐substituted benzimidazoles (N‐alkyl and N‐aryl) and subsequently reacted with the basic metal source Ag2O in acetonitrile–methanol. These compounds were characterized using
四个新的Ag(I)-N-杂环卡宾(NHC)配合物(5 - 8)轴承对称取代的NHC配体已经合成从相应的苯并咪唑溴化物盐;这些都是从单一的步骤可访问开始ñ -取代的苯并咪唑(ñ -烷基和N-芳基),然后与碱性金属源Ag 2 O在乙腈-甲醇中反应。这些化合物使用元素分析,1 H NMR,13 C NMR,傅里叶变换红外和紫外可见光谱技术以及摩尔电导率进行表征。复合物5的单晶结构研究表明,Ag(I)中心具有完全线性的C–Ag–C配位,并具有准平行的成对芳族苯并咪唑平面。所有复合物均通过插层模式与白纹伊蚊DNA相互作用,变色度较大,分别为22%和27%,变色度较小,分别为16%和19%。此外,所有复合物均通过非氧化机制途径表现出有效的DNA裂解活性。测试化合物的DNase活性显示出时间和浓度依赖性的活性模式。与较低浓度的苯并咪唑鎓盐相比,Ag(I)-NHC络合物显示出更高的DNA裂解活性。这些复合
Green synthesis of selenium-N-heterocyclic carbene compounds: Evaluation of antimicrobial and anticancer potential
作者:Amna Kamal、Mansoureh Nazari V.、Muhammad Yaseen、Muhammad Adnan Iqbal、Mohamed B. Khadeer Ahamed、Aman Shah Abdul Majid、Haq Nawaz Bhatti
DOI:10.1016/j.bioorg.2019.103042
日期:2019.9
the results were compared with standard drug 5-Fluorouracil. Se-NHC compounds and azolium salts showed significant anticancer potential. Molecular docking studies of compounds (VI, VII and VIII) showed strong binding energies and ligand affinity toward following angiogenic factors: VEGF-A (vascular endothelial growthfactor A), EGF (human epidermalgrowthfactor), HIF (Hypoxia-inducible factor) and
Benzimidazol-2-ylidene platinum complexes exhibit anticancer activity, which is tuneablevia N-alkyl residues and ancillary ligands and is different from that of cisplatin.