Synthesis, characterization, and antimicrobial activity of silver carbene complexes derived from 4,5,6,7-tetrachlorobenzimidazole against antibiotic resistant bacteria
作者:Brian D. Wright、Parth N. Shah、Lucas J. McDonald、Michael L. Shaeffer、Patrick O. Wagers、Matthew J. Panzner、Justin Smolen、Jasur Tagaev、Claire A. Tessier、Carolyn L. Cannon、Wiley J. Youngs
DOI:10.1039/c2dt00055e
日期:——
Silver N-heterocyclic carbene complexes have been shown to have great potential as antimicrobial agents, affecting a wide spectrum of both Gram-positive and Gram-negative bacteria. A new series of three silver carbene complexes (SCCs) based on 4,5,6,7-tetrachlorobenzimidazole has been synthesized, characterized, and tested against a panel of clinical strains of bacteria. The imidazolium salts and their precursors were characterized by elemental analysis, mass spectrometry, 1H and 13C NMR spectroscopy, and single crystal X-ray diffraction. The silver carbene complexes, SCC32, SCC33, and SCC34 were characterized by elemental analysis, 1H and 13C NMR spectroscopy, and single crystal X-ray diffraction. These complexes proved highly efficacious with minimum inhibitory concentrations (MICs) ranging from 0.25 to 6 μg mL−1. Overall, the complexes were effective against highly resistant bacteria strains, such as methicillin-resistant Staphylococcus aureus (MRSA), weaponizable bacteria, such as Yersinia pestis, and pathogens found within the lungs of cystic fibrosis patients, such as Pseudomonas aeruginosa, Alcaligenes xylosoxidans, and Burkholderia gladioli. SCC33 and SCC34 also showed clinically relevant activity against a silver-resistant strain of Escherichia coli based on MIC testing.
银N-杂环卡宾络合物已被证明具有作为抗菌剂的巨大潜力,能够影响广泛的革兰氏阳性和革兰氏阴性细菌。基于4,5,6,7-四氯苯并咪唑,合成、表征并测试了一系列三种银卡宾络合物(SCCs)对一组临床细菌菌株的活性。咪唑盐及其前体通过元素分析、质谱、1H和13C核磁共振波谱以及单晶X射线衍射进行了表征。银卡宾络合物SCC32、SCC33和SCC34通过元素分析、1H和13C核磁共振波谱以及单晶X射线衍射进行了表征。这些络合物表现出高度功效,最低抑制浓度(MICs)范围从0.25到6 μg mL^-1。总的来说,这些络合物对高度耐药的细菌菌株有效,例如耐甲氧西林金黄色葡萄球菌(MRSA)、可武器化的细菌如鼠疫耶尔森菌,以及在囊性纤维化患者肺部发现的病原体,如铜绿假单胞菌、木糖氧化产碱杆菌和格拉迪欧拉伯克霍尔德菌。SCC33和SCC34还基于MIC测试对一种耐银的大肠杆菌表现出临床相关的活性。