6‐azido‐6‐deoxy‐α‐D‐mannopyranoside template was used as a core structure for binding to the angiogenic growth factors FGF‐1, FGF‐2, and VEGF. The core structure was diversified in a rapid, parallel manner by employing the CuI‐catalyzed Huisgen azide–alkyne cycloaddition (“click”) reaction. The diversity was further extended by incorporating a Swern oxidation–Wittig reaction sequence on a click adduct of propargyl
使用脱硫的甲基6-叠氮基-6-脱氧-α- D-甘露吡喃糖苷模板作为与血管生成生长因子FGF-1,FGF-2和VEGF结合的核心结构。通过使用Cu I,以快速,平行的方式使核心结构多样化催化的Huisgen叠氮化物-炔烃环加成(“点击”)反应。通过在炔丙醇的点击加合物上结合Swern氧化-Wittig反应序列进一步扩展了多样性。因此,硫酸化核心通过各种间隔基连接到选定的疏水或极性基序,这些基序设计用于探测生长因子阳离子硫酸乙酰肝素结合位点周围的蛋白质表面,以提高亲和力和选择性。通过表面等离振子共振溶液亲和力测定法测量化合物对生长因子的亲和力。铅化合物与朝向FGF-1都和VEGF(微摩尔的结合亲和力识别ķ d = 84和49μ中号超过FGF-2,分别地)和良好的选择性(29-和51倍,分别地)。
Multifunctional multivalency: a focused library of polymeric cholera toxin antagonists
作者:Huu-Anh Tran、Pavel I. Kitov、Eugenia Paszkiewicz、Joanna M. Sadowska、David R. Bundle
DOI:10.1039/c0ob01089h
日期:——
the multivalent ligands is important for successful interaction with multimeric proteins. Polymer-based heterobifunctionalligands that contain pendant groups prearranged into heterodimers can be used to probe the active site and surrounding area of the receptor. Here we describe the synthesis and activities of a series of galactose conjugates on polyacrylamide and dextran. Conjugation of a second fragment
Sequential Au/Cu Catalysis: A Two Catalyst One-Pot Protocol for the Enantioselective Synthesis of Oxazole α-Hydroxy Esters <i>via</i>
Intramolecular Cyclization/Intermolecular Alder-Ene Reaction
作者:Kumara Swamy Nalivela、Matthias Rudolph、Elham S. Baeissa、Basma G. Alhogbi、Ibraheem A. I. Mkhalid、A. Stephen K. Hashmi
DOI:10.1002/adsc.201800246
日期:2018.6.5
alkylglyoxylates 3 was developed. The first step of the one‐pot procedure is the selective intramolecular in situ formation of an alkylideneoxazoline 2, which then in an intermolecular reaction is enantioselectively transformed to the oxazole α‐hydroxy ester derivatives 4 in quantitative yield and good to excellent enantioselectivity via an asymmetric copper(II)‐catalyzed Alder‐enereaction.
From Propargylic Amides to Functionalized Oxazoles: Domino Gold Catalysis/Oxidation by Dioxygen
作者:A. Stephen K. Hashmi、Maria Camila Blanco Jaimes、Andreas M. Schuster、Frank Rominger
DOI:10.1021/jo301288w
日期:2012.8.3
5-disubstituted oxazoles from propargylic amides is reported. A series of propargylic amides were transformed to the corresponding alkylideneoxazolines by a gold(I) catalyst. The next step was an autoxidation to hydroperoxides bearing the heteroaromatic oxazoles. Experiments addressing the reaction mechanism reveal a radical pathway for this autoxidation process. The hydroperoxides could conveniently be converted
Synthesis of Gallic Acid Analogs as Histamine and Pro-Inflammatory Cytokine Inhibitors for Treatment of Mast Cell-Mediated Allergic Inflammation
作者:Xiang Fei、In-Gyu Je、Tae-Yong Shin、Sang-Hyun Kim、Seung-Yong Seo
DOI:10.3390/molecules22060898
日期:——
inflammatory allergic reactions by blocking histamine release and pro-inflammatory cytokine expression. In this report, various amide analogs of gallic acid have been synthesized by introducing different amines through carbodiimide-mediated amide coupling and Pd/C-catalyzed hydrogenation. These compounds showed a modest to high inhibitory effect on histamine release and pro-inflammatory cytokine expression
没食子酸(3,4,5-三羟基苯甲酸)是一种天然产物,存在于各种食物和草药中,是众所周知的强效抗氧化剂。我们之前的报告表明,它通过阻断组胺释放和促炎细胞因子表达来抑制肥大细胞衍生的炎症过敏反应。在本报告中,通过碳二亚胺介导的酰胺偶联和 Pd/C 催化的氢化引入不同的胺,合成了各种没食子酸的酰胺类似物。这些化合物对组胺释放和促炎细胞因子表达表现出中等至高度的抑制作用。其中,带有酰胺的 (S)-苯基甘氨酸甲酯 3d 被发现比天然没食子酸更具活性。进一步优化产生了几种在体外抑制组胺释放的 (S)-和 (R)-苯基甘氨酸类似物。