New Stable Cu(I) Catalyst Supported on Weakly Acidic Polyacrylate Resin for Green C-N Coupling: Synthesis of N-(Pyridin-4-yl)benzene Amines and N,N-Bis(pyridine-4-yl)benzene Amines
作者:Nitin Kore、Pavel Pazdera
DOI:10.3390/molecules22010002
日期:——
A method for preparation of a new stable Cu(I) catalyst supported on weakly acidic polyacrylate resin without additional stabilizing ligands is described. A simple and efficient methodology for Ullmann Cu(I) catalyzed C-N cross coupling reactions using this original catalyst is reported. Coupling reactions of 4-chloropyridinium chloride with anilines containing electron donating (EDG) or electron withdrawing
描述了一种在没有额外稳定配体的情况下制备负载在弱酸性聚丙烯酸酯树脂上的新型稳定 Cu (I) 催化剂的方法。报道了使用这种原始催化剂的 Ullmann Cu (I) 催化 CN 交叉偶联反应的简单有效方法。4-氯吡啶鎓与分别含有给电子 (EDG) 或吸电子 (EWG) 基团、萘-2-胺和哌嗪的苯胺的偶联反应得到了成功证明。
Studies on Synthetic Approaches to 1<i>H</i>- and 2<i>H</i>-Indazolyl Derivatives
作者:Emre M. Isin、Milly de Jonge、Neal Castagnoli
DOI:10.1021/jo005786y
日期:2001.6.1
2H-indazolyl derivatives of potential biological interest are reported. Special emphasis has been placed on the characterization of indazolylpyridinium products generated from reactions between indazole and 4-chloro-1-methylpyridinium iodide under various conditions. A stable mixture consisting of 3 parts of the 1H-isomer 9 to 1 part of the 2H-isomer 10 was obtained at roomtemperature in the presence
Bis‐Cyclometallated Iridium(III) Complexes with Bidentate Ligands Containing One or Two Pyridylideneamine (PYE) Donors: Influence of PYE Substitution (
<i>para</i>
or
<i>ortho</i>
) on Complexation
作者:Noreldin S. Y. Abdolla、David L. Davies、Kuldip Singh
DOI:10.1002/ejic.202001054
日期:2021.3.12
bidentate ligands and their bis‐cyclometallated Ir(III) complexes have been synthesised and fully characterised. The PYE groups show a contribution from a neutral imine resonance form and a zwitterionic pyridinium form. NMR spectroscopy of the para‐substituted ligands and complexes show those with a C6H4 bridging group have the fastest PYE rotation. X‐ray crystallography of p‐1 and p‐3 shows the PYE N‐donor
已合成并充分表征了六个含有亚吡啶基亚胺(PYE)的双齿配体及其双环金属化Ir(III)配合物。PYE基团显示出来自中性亚胺共振形式和两性离子吡啶鎓形式的贡献。对位取代的配体和络合物的NMR光谱显示,具有C 6 H 4桥基的化合物的PYE旋转最快。p -1和p ‐ 3的X射线晶体学分析显示,PYE N-给体为三角形平面,而对于正离子络合物,它更呈锥体状,这意味着两性离子共振形式对正离子络合物的贡献增加。
Deuterium Kinetic Isotope Effect Studies of a Potential <i>in Vivo</i> Metabolic Trapping Agent for Monoamine Oxidase B
作者:Lindsey R. Drake、Allen F. Brooks、Anthony J. Mufarreh、Jonathan M. Pham、Robert A. Koeppe、Xia Shao、Peter J. H. Scott、Michael R. Kilbourn
DOI:10.1021/acschemneuro.8b00219
日期:2018.12.19
improve on the in vivo pharmacokinetics of [11C]Cou by using the deuterium kinetic isotopeeffect (KIE) to slow the MAO-B-mediated oxidation step and thus reduce the rate of trapping in brain tissues. However, in vitro assays of enzyme kinetics and in vivo PET imaging of pharmacokinetics in primate brain showed no effects of deuterium substitution on the tetrahydropyridine ring of [11C]Cou. The results
A cephalosporin derivative of the formula I:
in which X is S, 0, CH2 or SO. R1 is (optionally- substituted)imidazol-2-yl or one of the C-7 acyl groups known in the cephalosporin art, R2 is hydrogen or methoxy, R3 is carboxy or a biodegradiable ester thereof and -R4 is of the formula XII, XIII or XIV: R35
in which R32-R40 inclusive are as defined in the specification; and the salts thereof. Pharmaceutical compositions methods of manufacture and intermediates are also described.