Metal-Free Oxidative Coupling Reactions via σ-Iodonium Intermediates: The Efficient Synthesis of Bithiophenes Using Hypervalent Iodine Reagents
作者:Koji Morimoto、Tomofumi Nakae、Nobutaka Yamaoka、Toshifumi Dohi、Yasuyuki Kita
DOI:10.1002/ejoc.201100969
日期:2011.11
The direct oxidative biaryl couplingreaction is an attractive tool for environmentally benign green chemistry. A novel direct method for the synthesis of bithiophene using a hypervalentiodinereagent has been developed. The reaction mechanism has also been investigated, casting light on the reaction intermediate and revealing the reactivity with iodonium salts.
[EN] C(SP3)-C(SP2) CROSS-COUPLING REACTION OF ORGANOZINC REAGENTS AND HETEROCYCLIC (PSEUDO)HALIDES<br/>[FR] RÉACTION DE COUPLAGE CROISÉ C(SP3)-C(SP2) DE RÉACTIFS D'ORGANOZINC ET DE (PSEUDO)HALOGÉNURES HÉTÉROCYCLIQUES
申请人:UNIV HONG KONG SCI & TECH
公开号:WO2018019291A1
公开(公告)日:2018-02-01
Provided is a method of synthesizing a C(sp3)-C(sp2) cross-coupled compound comprising reacting a C(sp3) coupling partner with a C(sp2) coupling partner, a catalyst, and a solvent; wherein the C(sp3) coupling partner comprises an organic zinc reagent; and wherein the C(sp2) coupling partner comprises a heterocyclic halide or a heterocyclic pseudo halide. The method further comprises synthesis of the organic zinc reagent, wherein the synthesis comprises reacting a zinc powder with an acid, filtering, washing, and drying to obtain an activated zinc powder; and reacting the activated zinc powder with a metal iodide catalyst and a second solvent and heating for a predetermined time to obtain the organic zinc reagent.
Hypervalent iodine(III): selective and efficient single-electron-transfer (SET) oxidizing agent
作者:Toshifumi Dohi、Motoki Ito、Nobutaka Yamaoka、Koji Morimoto、Hiromichi Fujioka、Yasuyuki Kita
DOI:10.1016/j.tet.2009.10.040
日期:2009.12
ethers, affording the corresponding aromatic cation radicals. Since then, hypervalent iodine(III) has been utilized as a selective and efficient SET oxidizingagent that enables a variety of direct C–H functionalizations of aromatic rings in electron-rich arenes under mild conditions. We have now extended the original method to work in a series of heteroaromatic compounds such as thiophenes, pyrroles,
Discovery of Highly Potent Pinanamine-Based Inhibitors against Amantadine- and Oseltamivir-Resistant Influenza A Viruses
作者:Xin Zhao、Runfeng Li、Yang Zhou、Mengjie Xiao、Chunlong Ma、Zhongjin Yang、Shaogao Zeng、Qiuling Du、Chunguang Yang、Haiming Jiang、Yanmei Hu、Kefeng Wang、Chris Ka Pun Mok、Ping Sun、Jianghong Dong、Wei Cui、Jun Wang、Yaoquan Tu、Zifeng Yang、Wenhui Hu
DOI:10.1021/acs.jmedchem.8b00042
日期:2018.6.28
Influenza pandemic is a constant major threat to public health caused by influenza A viruses (IAVs). IAVs are subcategorized by the surface proteins hemagglutinin (HA) and neuraminidase (NA), in which they are both essential targets for drug discovery. While it is of great concern that NA inhibitor oseltamivir resistant strains are frequently identified from human or avian influenzavirus, structural
流行性感冒是由甲型流感病毒(IAV)引起的对公共健康的持续重大威胁。IAVs按表面蛋白血凝素(HA)和神经氨酸酶(NA)进行分类,它们都是药物发现的基本靶标。尽管人们经常从人或禽流感病毒中鉴定出NA抑制剂奥司他韦耐药株,这一点引起了极大的关注,但流感HA的结构和功能表征却为新的抗病毒治疗带来了希望。在这项研究中,我们探索了基于频胺的抗病毒药物的构效关系(SAR),并发现了强效抑制剂M090对抗耐金刚烷胺的病毒(包括2009 H1N1大流行毒株)和耐奥司他韦的病毒。作用机理的研究,特别是溶血抑制作用,表明M090靶向HA流感,它占据了HA 2结构域的高度保守的口袋,并通过在构象重排过程中“锁定” HA 2的弯曲状态来抑制病毒介导的膜融合。这项工作在HA蛋白中提供了新的结合位点,表明该口袋可能是广谱抗A型流感药物设计和开发的有希望的目标。
Direct Cyanation of Heteroaromatic Compounds Mediated by Hypervalent Iodine(III) Reagents: In Situ Generation of PhI(III)−CN Species and Their Cyano Transfer
作者:Toshifumi Dohi、Koji Morimoto、Naoko Takenaga、Akihiro Goto、Akinobu Maruyama、Yorito Kiyono、Hirofumi Tohma、Yasuyuki Kita
DOI:10.1021/jo061820i
日期:2007.1.1
in our laboratory provided insights into the real active iodine(III) species during the reaction; the reaction is induced by an active hypervalent iodine(III) species having a cyano ligand in situ generated by ligand exchange reaction at the iodine(III) center between trifluoroacetoxy group in PIFA and TMSCN, and effective cyanide introduction into heteroaromatic compounds is achieved by means of the