公开了一系列万古霉素 C 端胍修饰,可提高抗微生物活性,增强抗选择或诱导抗性的抗微生物作用的持久性,并引入独立于d -Ala- d的协同作用机制-Ala 结合和抑制细胞壁生物合成。添加的作用机制导致诱导的细菌细胞通透性,我们表明这可能涉及与细胞包膜磷壁酸的相互作用。值得注意的是,所检测的化合物包含两种组合外周修饰,即(4-氯联苯)甲基(CBP)和 C 端胍修饰,为新疗法提供了机会,不仅针对万古霉素敏感的细菌,尤其是针对万古霉素耐药的细菌,它们通过以下方式发挥作用:两种独立于d -Ala- d -Ala/ d 的协同且持久的作用机制- Lac 结合并显示出极好的抗菌效力(MIC 0.6–0.15 μg/mL,VanA VRE)。我们第一次证明了所检查的外周修饰的协同行为需要在单个分子中同时存在 CBP 和胍修饰,而不是它们作为单一修饰化合物的等摩尔混合物的组合使用。最后,我们展示了该系列的典型成员
N1-苄基-2-甲基-1,2-丙二胺(I)和 5-氨基-1,3-二苄基-5-甲基六氢嘧啶(II)的盐酸盐在加压催化氢化作用下发生脱苄基反应。由 I 得到的 2-甲基-1, 2-丙二胺(III)被衍生成单胍化合物。通过比较相关化合物的红外光谱,可以断定该化合物的结构为(2-氨基-2-甲基丙基)胍。从 II 中得到的 2-甲基-1,2,3-丙三胺、其起始原料 II 和其他乙二胺衍生物也在硫酸 S-甲基异硫脲的作用下被胍化。
acceptable results. According to this approach an efficient formation of Schiff bases was achieved in the presence of TiCl(4). Substances were isolated by reversed phase chromatography; in some cases isomers were additionally separated by chiral chromatography on Chirobiotic T. When tested on human recombinant melanocortin receptors all the tertiaryamides showed some binding affinities; for the highest affinity
detection of free radicals is an active area of research. Here, we describe the synthesis and radical-trapping properties of new derivatives of DEPMPO and DIPPMPO, bearing a mitochondria-targeting triphenylphosphonium cationic moiety or guanidinium cationic group. All of the spin traps prepared have been observed to efficiently trapsuperoxideradical anions in a cell-free system. The superoxide spin adducts
Maleimide Conjugates of Saxitoxin as Covalent Inhibitors of Voltage-Gated Sodium Channels
作者:William H. Parsons、J. Du Bois
DOI:10.1021/ja4019644
日期:2013.7.24
(+)-Saxitoxin, a naturally occurring guanidinium poison, functions as a potent, selective, and reversible inhibitor of voltage-gated sodium ion channels (Na(V)s). Modified forms of this toxin bearing cysteine-reactive maleimide groups are available through total synthesis and are found to irreversibly inhibit sodium ion conductance in recombinantly expressed wild-type sodium channels and in hippocampal nerve cells. Our findings support a mechanism for covalent protein modification in which toxin binding to the channel pore precedes maleimide alkylation of a nucleophilic amino acid. Second-generation maleimide-toxin conjugates, which include bioorthogonal reactive groups, are also found to block channel function irreversibly; such compounds have potential as reagents for selective labeling of Na(V)s for live cell imaging and/or proteomics experiments.
Development of Tetrahydroindazole‐Based Potent and Selective Sigma‐2 Receptor Ligands
作者:Iredia D. Iyamu、Wei Lv、Neha Malik、Rama K. Mishra、Gary E. Schiltz
DOI:10.1002/cmdc.201900203
日期:2019.7.3
importance. Herein we report the development of a series of tetrahydroindazole compounds that are highly potent and selective for sigma‐2. Structure–activity relationship data were used to generate a pharmacophore model that summarizes the common features present in the potent ligands. Assays for solubility and microsomal stability showed that several members of this compound series possess promising characteristics
Identification and SAR of novel diaminopyrimidines. Part 2: The discovery of RO-51, a potent and selective, dual P2X3/P2X2/3 antagonist for the treatment of pain
作者:Alam Jahangir、Muzaffar Alam、David S. Carter、Michael P. Dillon、Daisy Joe Du Bois、Anthony P.D.W. Ford、Joel R. Gever、Clara Lin、Paul J. Wagner、Yansheng Zhai、Jeff Zira
DOI:10.1016/j.bmcl.2009.01.097
日期:2009.3
The purinoceptor subtypes P2X(3) and P2X(2/3) have been shown to play a pivotal role in models of various pain conditions. Identification of a potent and selective dual P2X(3)/P2X(2/3) diaminopyrimidine antagonist RO-4 prompted subsequent optimization of the template. This paper describes the SAR and optimization of the diaminopyrimidine ring and particularly the substitution of the 2-amino group. The discovery of the highly potent and drug-like dual P2X(3)/P2X(2/3) antagonist RO-51 is presented. (C) 2009 Elsevier Ltd. All rights reserved.