过渡金属催化的单分子片段偶联 (UFC) 定义为通过分子(如 CO 和 CO 2)的挤出以及随后剩余片段的重组形成新化学键的过程。在此,我们报道了一种新的 UFC 反应,该反应涉及钯催化从酰胺中消除异氰酸酯片段,形成碳-碳和碳-杂原子键。通过 X 射线晶体学表征了与催化反应相关的有机金属中间体。这种 UFC 反应能够实现酰胺官能团的后期转化,从而使酰胺能够用作可转换的导向或保护基团。
Design, Synthesis, Antiviral, and Cytostatic Evaluation of Novel Isoxazolidine Analogs of Homonucleotides
作者:Magdalena Łysakowska、Jan Balzarini、Dorota G. Piotrowska
DOI:10.1002/ardp.201300382
日期:2014.5
diastereoselectivities (d.e. 2–62%) of isoxazolidinehomonucleotides were observed for cycloadditions between N‐methyl‐C‐(diethoxyphosphoryl)nitrone and N‐allyl nucleobases, with trans‐isoxazolidines predominating. The stereochemistry of the substituted isoxazolidines was established based on 2D NOE experiments performed for uracil‐containing cycloadducts. The cis‐ and trans‐isoxazolidine phosphonates obtained herein
对于 N-甲基-C-(二乙氧基磷酰基)硝酮和 N-烯丙基核碱基之间的环加成,观察到异恶唑烷同核苷酸的中等非对映选择性(de 2-62%),其中反式异恶唑烷占主导地位。取代的异恶唑烷的立体化学是基于对含尿嘧啶环加合物进行的 2D NOE 实验建立的。在体外评估了本文获得的顺式和反式异恶唑烷膦酸酯对多种 DNA 和 RNA 病毒的活性。没有一种化合物在亚毒性浓度下具有抗病毒活性,但发现其中一些化合物抑制 L1210 细胞的增殖,IC50 值在 33–100 µM 范围内。
Antimicrobial activities of bis-(N-alkylbenzimidazole)-cobalt(II) and zinc(II) complexes
6-dimethyl-benzimidazole, were coordinated to cobalt(II) and zinc(II) cations to form complexes of the type [MCl2L2]. Single-crystal X-ray structures were determined for two cobalt(II) and for one zinc(II) complexes and confirmed their tetrahedral molecular geometry. The antibacterial and antifungal activities of these two series of cobalt(II) and zinc(II) complexes were studied against Gram-negative (Escherichia
八种苯并咪唑前体(L),即1-烯丙基-苯并咪唑、1-甲代烯丙基-苯并咪唑、1-异丙基-苯并咪唑、1-(3-甲基氧杂环丁烷-3-基)甲基-苯并咪唑、1-烯丙基-5,6-二甲基-苯并咪唑、1-甲代烯丙基-5,6-二甲基-苯并咪唑、1-异丙基-5,6-二甲基-苯并咪唑和1-(3-甲基氧杂环丁烷-3-基)甲基-5,6-二甲基-苯并咪唑被配位与钴(II)和锌(II)阳离子形成[MCl 2 L 2 ]类型的络合物。确定了两种钴 (II) 和一种锌 (II) 配合物的单晶 X 射线结构,并确认了它们的四面体分子几何形状。研究了这两个系列的钴(II)和锌(II)配合物对革兰氏阴性菌的抗菌和抗真菌活性(大肠杆菌、铜绿假单胞菌、鲍曼不动杆菌和肺炎克雷伯菌)、革兰氏阳性菌(金黄色葡萄球菌、耐甲氧西林金黄色葡萄球菌和粪肠球菌)细菌和真菌菌株(白色念珠菌和光滑念珠菌)。总体而言,钴(II)络合物对所有微生物都比锌(
Antimicrobial and antibiofilm activities and bovine serum albumin binding properties of benzimidazolium derivative NHC salts and their Ag(I)‐NHC complexes
investigated by molecular docking methods. While N-heterocyclic carbene salts showed moderate antifungal and antibiofilm activity, silver complexes of these salts have strong antimicrobial activity with <1.9–15.6 μg/ml minimal inhibitory concentration (MIC) values. On the other hand, carbene salts have better affinity against BSA than the complexes. Additionally, the interaction of the optimized complexes with
苯并咪唑型N-杂环卡宾分子及其金属配合物具有众所周知的生物活性。元素银和银络合物也具有抗菌和抗真菌活性。在这项研究中,分析了具有 1-烯丙基 5,6-二甲基苯并咪唑衍生物配体的银配合物的抗菌和抗生物膜活性。此外,通过分光光度法分析了分子的牛血清白蛋白(BSA)结合特性,并通过分子对接方法研究了分子与BSA相互作用的细节。虽然 N-杂环卡宾盐显示出中等的抗真菌和抗生物膜活性,但这些盐的银复合物具有很强的抗菌活性,最小抑菌浓度 (MIC) 值 <1.9–15.6 μg/ml。另一方面,与复合物相比,卡宾盐对 BSA 的亲和力更好。此外,通过分子对接方法分析了优化后的复合物与 SarA 和 BSA 的相互作用。根据体外和计算机评估,所研究的 Ag 复合物可用于高级研究。
Design, synthesis, antimicrobial activity and molecular docking study of cationic bis‐benzimidazole‐silver(I) complexes
series of bis(1-alkylbenzimidazole)silver(I) nitrate and bis(1-alkyl-5,6-dimethylbenzimidazole)silver(I) nitrate complexes, in which the alkyl substituent is either an allyl, a 2-methylallyl, an isopropyl or a 3-methyloxetan-3-yl-methyl chain, were synthesized and fully characterized. The eight N-coordinated silver(I) complexes were screened for both antimicrobialactivities against Gram-negative (Escherichia
Page 11037. The required annotation for compound 6j in Table 4 was inadvertently missing in our original manuscript. Footnote c has been added to 6j to note that a higher reaction temperature and a longer reaction time were required for this specific substrate, as given below. This information is also included in the revised Supporting Information. The Supporting Information is available free of charge