‘Click’ ligand for ‘click’ chemistry: (1-(4-methoxybenzyl)-1-H-1,2,3-triazol-4-yl)methanol (MBHTM) accelerated copper-catalyzed [3+2] azide–alkyne cycloaddition (CuAAC) at low catalyst loading
作者:Rajesh H. Tale、Venkatesh B. Gopula、Gopal K. Toradmal
DOI:10.1016/j.tetlet.2015.09.010
日期:2015.10
1,2,3-triazol-4-yl)methanol (MBHTM) synthesized itself by ‘click’ chemistry shown to promote the dramatic rate enhancement of copper catalyze azide–alkyne cycloaddition (CuAAC) at lowcatalystloading to give diverse 1,4-disustituted 1,2,3-triazoles in high to excellent yields under mild conditions. Using higher catalyst and ligand loading, excellent and 49% yield of the corresponding 1,2,3 triazole
易于获得,具有成本效益,非常稳定且易于调节的基于1,2,3-三唑的配体,(1-(4-甲氧基苄基)-1 - H -1,2,3-三唑-4-基)甲醇(MBHTM)通过“点击”化学反应自行合成的结果表明,在低催化剂负载量下,铜催化叠氮化物-炔烃环加成反应(CuAAC)的速率大大提高,在温和的条件下,可以高产率或优异产率得到各种1,4-废弃的1,2,3-三唑情况。使用较高的催化剂和配体负载量,分别在不到一个小时和几分钟的时间内即可获得相应的1,2,3三唑产物优异的收率和49%的收率,这表明该反应可用于开发快速“点击”反应协议。
A Class of Fe
<sup>III</sup>
Macrocyclic Complexes with Alcohol Donor Groups as Effective
<i>T</i>
<sub>1</sub>
MRI Contrast Agents
作者:Eric M. Snyder、Didar Asik、Samira M. Abozeid、Ariel Burgio、Gage Bateman、Steven G. Turowski、Joseph A. Spernyak、Janet R. Morrow
DOI:10.1002/anie.201912273
日期:2020.2.3
studies suggested that FeIII complexes cannot compete with GdIII complexes as T1 MRIcontrastagents. Now it is shown that one member of a class of high-spin macrocyclic FeIII complexes produces more intense contrast in mice kidneys and liver at 30 minutes post-injection than does a commercially used GdIII agent and also produces similar T1 relaxivity in serum phantoms at 4.7 T and 37 °C. Comparison of
早期研究表明,FeIII复合物不能作为T1 MRI造影剂与GdIII复合物竞争。现在表明,与商业使用的GdIII药剂相比,注射后30分钟时一类高旋转大环FeIII配合物在小鼠肾脏和肝脏中产生更强烈的对比度,并且在4.7的血清体模中产生类似的T1弛豫性。 T和37℃。四种不同的FeIII大环配合物的比较阐明了导致体内松弛性的因素,包括溶液形态。可变温度的17 O NMR研究表明,所有配合物都没有单个完整的内层水,该水在NMR时标上迅速交换。小鼠的MRI研究表明,三种FeIII配合物在体内的差异很大,部分与幻像中的r1弛豫性相对应。
[EN] COMPOUNDS FOR USE AS IRON(III) MRI CONTRAST AGENTS<br/>[FR] COMPOSÉS DESTINÉS À ÊTRE UTILISÉS EN TANT QU'AGENTS DE CONTRASTE EN IRM À BASE DE FER (III)
申请人:UNIV NEW YORK STATE RES FOUND
公开号:WO2018213853A1
公开(公告)日:2018-11-22
Provided are macrocyclic compounds and compounds with two or more macrocyclic groups, iron coordinated macrocyclic compounds, and iron coordinated compounds with two or more macrocyclic groups. The iron is high-spin iron(III). The iron coordinated compounds may exhibit a negative redox potential (e.g., relative to a normal hydrogen electrode at a biologically relevant pH, for example, a pH of 6.5-7.5). The compounds can be used as MRI contrast agents.
Synthesis of novel 1,4-disubstituted 1,2,3-triazoles bearing organosilicon-sulfur groups via the click reaction sonocatalyzed by LaCu<sub>x</sub>Mn<sub>1-x</sub>O<sub>3</sub> nanoparticles
作者:Kazem D. Safa、Hanieh Mousazadeh
DOI:10.1080/00397911.2016.1217339
日期:2016.10.1
ABSTRACT A highly efficient and environmentally friendly one-pot procedure for the synthesis of 1,2,3-triazoles by 1,3-dipolarcycloaddition of benzyl halides, terminal alkynes, and sodium azide over LaCuxMn1-xO3 perovskite oxides was developed. LaCu0.7Mn0.3O3 was found to be active with low catalyst loading under ultrasonic irradiation in aqueous media. The reaction was performed efficiently in the presence
Copper(<scp>ii</scp>) complexes of <i>N</i>-propargyl cyclam ligands reveal a range of coordination modes and colours, and unexpected reactivity
作者:Andrew J. Counsell、Mingfeng Yu、Mengying Shi、Angus T. Jones、James M. Batten、Peter Turner、Matthew H. Todd、Peter J. Rutledge
DOI:10.1039/d0dt03736b
日期:——
the coordination chemistry of copper(II) complexes of cyclam derivatives with between 1 and 4 pendant alkynes. The crystalstructures of these copper complexes unexpectedly reveal a range of coordination modes, and the surprising occurrence of five unique complexes within a single recrystallisation of the tetra-N-propargyl cyclam ligand. One of these species exhibits weak intramolecular copper-alkyne