Novel 1-(pyridylphenyl)-1-phenyl-2-imidazolylethanols with topical antiinflammatory activity
摘要:
The synthesis, biological evaluation, and structure-activity relationships of a series of 1-(pyridylphenyl)-1-phenyl-2-imidazolylethanols are described. These compounds show potent dose-dependent topical antiinflammatory activity in murine models of skin inflammation. This effect is likely due to inhibition of cytochrome P450 and consequent reduction in levels of 12R-HETE in the skin. These compounds were examined for their ability to inhibit the oxidative metabolism of arachidonic acid; they specifically inhibit the formation of prostacyclins in mouse macrophages. To study the effects of structure on the in vivo activity, three general features of the molecules were varied: the position of attachment of the pyridine nucleus (A), the second aromatic residue (B), and the nitrogen base on the ethanol chain (C). 1-[4-(4-Pyridyl)phenyl]-1-(4-fluorophenyl)-2-imidazolylethanol (2a, DuP 983) shows a very attractive profile of antiinflammatory activity and has been selected for clinical evaluation as a topical antiinflammatory agent.
Transition-Metal-Free Intramolecular Carbene Aromatic Substitution/Büchner Reaction: Synthesis of Fluorenes and [6,5,7]Benzo-fused Rings
作者:Zhenxing Liu、Haocheng Tan、Long Wang、Tianren Fu、Ying Xia、Yan Zhang、Jianbo Wang
DOI:10.1002/anie.201409982
日期:2015.3.2
Intramoleculararomaticsubstitution and Büchner reaction have been established as powerful methods for the construction of polycyclic compounds. These reactions are traditionally catalyzed by RhII catalysts with α‐diazocarbonyl compounds as the substrates. Herein a transition‐metal‐free intramoleculararomaticsubstitution/Büchner reaction is presented. These reactions use readily available N‐tosylhydrazones
Photochemistry of acyloximes: synthesis of heterocycles and natural products
作者:Rafael Alonso、Alegría Caballero、Pedro J. Campos、Miguel A. Rodríguez
DOI:10.1016/j.tet.2010.09.078
日期:2010.11
New applications of the photochemically generated iminyl radicals ring closure onto phenyl, thiophenyl, and pyridinyl rings are presented. The influence on the reactivity of different substituent throughout the acyloxime structure is discussed. Some observed effects are interpreted from computational studies. This reaction provides a new, simple, and straightforward method for the preparation of several
Intramolecular Minisci acylation under silver-free neutral conditions for the synthesis of azafluorenones and fluorenones
作者:Joydev K. Laha、Ketul V. Patel、Gurudutt Dubey、Krupal P. Jethava
DOI:10.1039/c7ob00077d
日期:——
Despite its synthetic potential, intramolecularacylation by the Minisci reaction remains unexplored. The development of a new intramolecular Minisci acylation under silver-free neutral conditions providing access to azafluorenones and fluorenones is described. Distinct from the current literature known approaches for Minisci acylation, the report described herein features a method that: (a) avoids
Cathode Material Determines Product Selectivity for Electrochemical C−H Functionalization of Biaryl Ketoximes
作者:Huai‐Bo Zhao、Pin Xu、Jinshuai Song、Hai‐Chao Xu
DOI:10.1002/anie.201809679
日期:2018.11.12
N‐oxides has been developed through electrochemicalC−Hfunctionalization of biarylketoximes. The oxime substrates undergo dehydrogenative cyclization when a Pt cathode is used, resulting in unprecedented access to a wide range of N‐heteroaromatic N‐oxides. The products of the electrosynthesis are switched to the deoxygenated N‐heteroaromatics by employing a Pb cathode through sequential anode‐promoted
In this paper, we describe a novel N–O photolysis of o-nitrobenzyl oxime ethers that enables the synthesis of phenanthridines via intramolecular cyclizationreactions. Without the use of additional photocatalysts or photosensitizers, the process proceeds with an efficiency of ≤96% upon exposure of the sample to near-visible light (405 nm) under aqueous conditions. Through the photoinduced production
在本文中,我们描述了一种新型的邻硝基苄基肟醚的 N-O 光解,它能够通过分子内环化反应合成菲啶。在不使用额外的光催化剂或光敏剂的情况下,在水性条件下将样品暴露于近可见光 (405 nm) 时,该过程的效率≤96%。通过在 HeLa 细胞中光诱导产生荧光菲啶衍生物,证明了生物条件下反应的进展。这种光诱导环化反应可用作不同的光化学仪器,通过诱导生物活性分子的产生来控制生物过程。