Potent Antimalarial Activity of 2-Aminopyridinium Salts, Amidines, and Guanidines
摘要:
We describe the design, synthesis, and antimalarial activity of 60 bis-tertiary amine, bis-2(1H)-imino-heterocycle, bis-amidine, and bis-guanidine series. Bis-tertiary amines with a linker from 12 to 16 methylene groups were active against the in vitro growth of Plasmodium falciparum within the 10(-6)-10(-7) M concentration range. IC50 decreased by 2 orders of magnitude for bis-2-aminopyridinium salts, bis-amidines, and bis-guanidines (27 compounds with IC50 < 10 nM). Increasing the alkyl chain length from 6 to 12 methylene groups led to increased activity, while beyond this antimalarial activity decreased. Antimalarial activities appear to be strictly related to the basicity of the cationic head with an optimal pK(a) over 12.5. Maximal activity occurs for bis-2-aminopyridinium, two C-duplicated bis-amidines, and three bis-guanidines, with IC50 values lower than 1 nM. In. comparison to similar quaternary ammonium salts, amidinium compounds have distinct structural requirements for antimalarial activity and likely additional binding opportunities on account of their hydrogen-bond-forming properties.
合成了基于带有四个磷酸酯基团的基于甘脲的骨架的分子镊子,该分子镊子能够结合水溶液中的有机胺。这项工作报告了通过1 H NMR滴定确定的该分子镊子和胺客体的30种配合物的Ka值。疏水腔和磷酸基团均有助于结合。由于空间冲突和库仑排斥,较松散的分子和带有负电荷基团的分子(如氨基酸中的羧酸盐)的结合较不紧密。磷酸基团与铵客体的狭窄空腔和强离子相互作用有利于脂肪族二胺的结合。这些结合特性使该系统与结构上相关的分子夹和镊子明显区分开。
Compounds with antiparasitic activity and medicines containing same
申请人:Vial Henri
公开号:US20050176819A1
公开(公告)日:2005-08-11
The invention relates to compounds having an anti-parasitic, in particular antimalarial activity, characterized in that they correspond to general formula (I)
Applications in particular as compounds with anti-parasitic activity.
作者:Wenxian Ma、Tingting Cheng、Fang‐Zi Liu、Yan Liu、KaKing Yan
DOI:10.1002/anie.202202213
日期:2022.4.25
Analogous to allosteric enzymes, guest binding introduces a directional pulling or pushing force that acts on the reverse side of a Zn salen complex. This tunable intramolecular force promotes various degrees of conformational and torsional strain, as predicted by both classical conformational analysis and DFT. This strain energy can be further applied to cleave chemical bonds, and the efficiency can
species. The stoichiometry of the calixarene/diammonium ion inclusion complexes was found to be strongly dependent on the length and the number of equivalents of the guest used. The selective formation of endo-cavity “supramolecular bola-amphiphiles” and the additional interplay of electrostatic/hydrophobic interactions yielded “NMR-visible” and “NMR-invisible” supramolecular assemblies of different natures
Unconventional U-shaped conformation of a bolaamphiphile embedded in a synthetic host
作者:Kangkyun Baek、Youngkook Kim、Hyunuk Kim、Minyoung Yoon、Ilha Hwang、Young Ho Ko、Kimoon Kim
DOI:10.1039/c0cc00752h
日期:——
The X-ray crystal structure of 1,12-dodecane diammonium (C12DA2+) encapsulated in cucurbit[8]uril reveals an unconventional U-shaped conformation of C12DA2+, which is attributed to the favorable host–guest interactions to overcome the charge–charge repulsion of the two ammonium groups in close proximity and high internal strain.
封装在葫芦[8]脲中的 1,12-十二烷二铵(C12DA2+)的 X 射线晶体结构显示,C12DA2+ 呈非常规的 U 形构象,这归因于有利的主客体相互作用,克服了两个铵基靠近时的电荷排斥和高内应变。
Non-ionic [2]rotaxanes have been prepared from complexes of
oligoethylene derivatives with methylated α-cyclodextrins by capping
them with trinitrophenyl groups as stoppers.