Benzohydroxamic acids as potent and selective anti-HCV agents
摘要:
A diverse collection of 40 derivatives of benzohydroxamic acid (BHAs) of various structural groups were synthesized and tested against hepatitis C virus (HCV) in full-genome replicon assay. Some of these compounds demonstrated an exceptional activity, suppressing viral replication at sub-micromolar concentrations. The compounds were inactive against key viral enzymes NS3, and NS5B in vitro assays, suggesting host cell inhibition target(s). The testing results were consistent with metal coordination by the BHAs hydroxamic group in complex with a target(s). Remarkably, this class of compounds did not suppress poliomyelitis virus (PV) propagation in RD cells indicating a specific antiviral activity of BHAs against HCV. (C) 2013 Elsevier Ltd. All rights reserved.
Rhoda‐Electrocatalyzed Bimetallic C−H Oxygenation by Weak
<i>O</i>
‐Coordination
作者:Xuefeng Tan、Leonardo Massignan、Xiaoyan Hou、Johanna Frey、João C. A. Oliveira、Masoom Nasiha Hussain、Lutz Ackermann
DOI:10.1002/anie.202017359
日期:2021.6.7
Rhodium-electrocatalyzed arene C−Hoxygenation by weakly O-coordinating amides and ketones have been established by bimetallic electrocatalysis. Likewise, diverse dihydrooxazinones were selectively accessed by the judicious choice of current, enabling twofold C−H functionalization. Detailed mechanistic studies by experiment, mass spectroscopy and cyclovoltammetric analysis provided support for an unprecedented
Microwave-Assisted Synthesis of Heterocycles by Rhodium(III)-Catalyzed Annulation of <i>N</i>
-Methoxyamides with α-Chloroaldehydes
作者:Ji-Rong Huang、Carsten Bolm
DOI:10.1002/anie.201710776
日期:2017.12.11
α‐Chloroaldehydes have been used as alkyne equivalents in rhodium‐catalyzed syntheses of isoquinolones and 3,4‐dihydroisoquinolins starting from N‐methoxyamides. Compared to the existing technology, a complementary regioselectivity is achieved. Mechanistic investigations have been performed, and it was found that steric effects of both substrate and additive determine the product selectivity. Various
Thermodynamic and structural study of complexation of phenylboronic acid with salicylhydroxamic acid and related ligands
作者:Mayte A. Martínez-Aguirre、Marcos Flores-Alamo、Anatoly K. Yatsimirsky
DOI:10.1002/aoc.4405
日期:2018.8
Stability constants of boronate complexes with a highly efficient bioconjugation ligand salicylhydroxamic acid, its derivatives and some structurally related compounds were determined by potentiometric and spectroscopic titrations at variable pH allowing one to obtain detailed stability – pH profiles and to identify the optimum pH for complexation with each ligand. The N,O‐binding of salicylhydroxamic
硼酸盐与高效生物共轭配体水杨基异羟肟酸的配合物,其衍生物和一些与结构相关的化合物的稳定性常数通过电位计和分光光度滴定法在不同的pH值下确定,从而获得详细的稳定性– pH曲线并确定与每种络合的最佳pH配体。水杨酸异羟肟酸通过硼酸与酚OH和异羟肟酸NH基团的缩合形成N,O-结合,是通过分离的苯基硼酸和4-硝基苯基硼酸配合物的晶体结构确定的。尽管对于N-甲基化水杨基异羟肟酸而言,这种结合是不可能的,但它仍会形成稳定的硼酸酯络合物,据称其涉及异常的7元–O–B–O–循环,并受11 H NMR研究。缺少邻-OH基团的异羟肟酸和水杨酰酰肼形成的硼酸酯络合物较不稳定,但其稳定性与消泡剂络合物相似,可用于共轭应用。与其他形成四面体阴离子络合物的配体相反,水杨酰胺肟形成四面体但在弱酸溶液中具有高稳定性的中性硼酸酯络合物。2,6-二羟基苯并异羟肟酸在中性和酸性溶液中的亲和力最高,超过了水杨基异羟肟酸(K obs
Green Synthesis of 3,4‐Unsubstituted Isoquinolones through Rhodium(III)‐Catalyzed C−H Activation and Annulation in Ethanol
作者:Vikash Kumar、Parthasarathy Gandeepan
DOI:10.1002/ejoc.202300914
日期:2023.11.21
An efficient method for synthesizing 3,4-unsubstituted isoquinolines has been developed via rhodium(III)-catalyzedC−Hactivation and annulation under mild reaction conditions.
Provided is a carrier that can achieve both the stability of a biological drug in blood and its release in a target cell. A pharmaceutical composition of the present invention includes: a polymer unit α having a hydrophilic polymer chain segment and a cationic polymer chain segment; a polymer unit β having a hydrophilic polymer chain segment and a cationic polymer chain segment; and a drug. The polymer unit α and the polymer unit β form a micelle by being radially arranged so that the cationic polymer chain segments are directed inward and the hydrophilic polymer chain segments are directed outward, the micelle encapsulating the drug. The cationic polymer chain segment of the polymer unit α has a phenylboronic acid group in a side chain, and the cationic polymer chain segment of the polymer unit β has a phenylboronic acid binding site in a side chain, and the phenylboronic acid group and the phenylboronic acid binding site form a cross-linked structure that is disintegrable under an acidic environment or in the presence of a substance capable of competitive binding.