Discovery, Synthesis, and Biological Evaluation of a Novel Group of Selective Inhibitors of Filoviral Entry
作者:Maria V. Yermolina、Jizhen Wang、Michael Caffrey、Lijun L. Rong、Duncan J. Wardrop
DOI:10.1021/jm1008715
日期:2011.2.10
Herein, we report the development of an antifiloviral screening system, based on a pseudotyping strategy, and its application in the discovery of a novel group of small molecules that selectivelyinhibit the Ebola and Marburg glycoprotein (GP)-mediated infection of human cells. Using Ebola Zaire GP-pseudotyped HIV particles bearing a luciferase reporter gene and 293T cells, a library of 237 small molecules
在此,我们报告了基于假型策略的抗丝病毒筛选系统的开发,及其在发现一组新的小分子中的应用,这些小分子选择性地抑制了埃博拉病毒和马尔堡糖蛋白 (GP) 介导的人类细胞感染。使用带有荧光素酶报告基因和 293T 细胞的 Ebola Zaire GP 假型 HIV 颗粒,筛选了 237 个小分子库以抑制 GP 介导的病毒进入。从该测定中,先导化合物8a被鉴定为丝状病毒进入的选择性抑制剂,IC 5030 μM。为了分析功效的官能团要求,然后使用“点击”化学制备的 56 种异恶唑和三唑衍生物对这种 3,5-二取代异恶唑进行结构-活性关系分析。该研究表明,虽然异恶唑环可以被三唑系统取代,但在8a 中发现的 5-(二乙氨基)乙酰胺取代基是抑制病毒细胞进入所必需的。3-芳基取代基的变化提供了许多更有效的抗病毒剂,IC 50值范围为2.5 μM。还发现先导化合物8a及其三种衍生物可阻断马尔堡糖蛋白 (GP) 介导的人类细胞感染。
Reaction of allenylmagnesium and allenylindium bromides with nitrile oxides: synthesis of novel 5-butynyl- and 5-methylisoxazoles
obtained in high yields through a domino addition, C–O heterocyclization involving allenylmagnesium bromide and benzonitrile oxide in dry THF, in which the corresponding 5-methylisoxazoles were isolated in trace amounts. However, when the reactions were attempted in aqueous media using allenylindium bromide, 5-methylisoxazoles were formed as the sole products in high yields.
An organo-NHC catalyzed domino addition approach for the selective synthesis of 5-butynylisoxazoles and subsequent Sonogashira coupling
作者:Shravankumar Kankala、Sreekantha B. Jonnalagadda、Chandra Sekhar Vasam
DOI:10.1039/c5ra11947b
日期:——
A nucleophilic organo N-heterocyclic carbene (NHC) catalysed click-type fast dominoaddition of allenyl-MgBr to aryl nitrile oxides to produce 5-butynylisoxazoles with excellent selectivity and good yields is reported. The unwanted protonation and subsequent formation of 5-methylisoxazole byproducts is successfully suppressed. Furthermore, a Pd/Ag catalysed protocol for Sonogashira cross-coupling of
Synthesis, antimalarial activity, and target binding of dibenzazepine-tethered isoxazolines
作者:Koravangala S. Vinay Kumar、Gejjalagere S. Lingaraju、Yadaganahalli K. Bommegowda、Ajjampura C. Vinayaka、Pritesh Bhat、Challanayakanahally S. Pradeepa Kumara、Kanchugarakoppal S. Rangappa、D. Channe Gowda、Maralinganadoddi P. Sadashiva
DOI:10.1039/c5ra17926b
日期:——
A series of dibenzazepine tethered 3,5-disubstituted isoxazolines was synthesized and evaluated for their antimalarial activity usingP. falciparum3D7 strain. Further, the potent molecules were assessed againstP. falciparumD6, W2 and 7G8 strains.
In the present study, novel Spiro derivatives of alpha-santonin were prepared and tested for their anticancer activity against a panel of six human cancer cell lines. Spiro-isoxazoline and spiro-isoxazolidine derivatives have been generated on C-ring of alpha-santonin (alpha-methylene-gamma-butyrolactone) by the 1,3-dipolar cycloaddition of alpha-santonin derivative 6 with nitrile oxides 7 and nitrones 9 respectively. Among all, compound 10b '' had shown IC50 of 0.01, 0.5 and 0.3 mu M against PC-3, THP-1 and MCF-7 cell lines respectively. Further, flow cytometry studies showed that PC-3 cells treated with the spiro-isoxazolidine derivative 10b '' were arrested in the sub G1 phase of the cell cycle in a concentration dependent manner. The spiro-isoxazolidine derivative 10b '' also showed concentration dependent inhibitory activity against NF-kappa B, p65 with 57% inhibition in 24 h at 10 mu M. (C) 2013 Elsevier Masson SAS. All rights reserved.