Antibacterial activity of quinoxalines, quinazolines, and 1,5-naphthyridines
作者:Ajit K. Parhi、Yongzheng Zhang、Kurt W. Saionz、Padmanava Pradhan、Malvika Kaul、Kalkal Trivedi、Daniel S. Pilch、Edmond J. LaVoie
DOI:10.1016/j.bmcl.2013.06.048
日期:2013.9
Several phenylsubstituted naphthalenes and isoquinolines have been identified as antibacterial agents that inhibit FtsZ-Zing formation. In the present study we evaluated the antibacterial of several phenylsubstituted quinoxalines, quinazolines and 1,5-naphthyridines against methicillin-sensitive and methicillin-resistant Staphylococcus aureus and vancomycin-sensitive and vancomycin-resistant Enterococcus
Aerobic oxidative C–H/C–H coupling of azaaromatics with indoles and pyrroles in the presence of TiO<sub>2</sub>as a photocatalyst
作者:I. A. Utepova、M. A. Trestsova、O. N. Chupakhin、V. N. Charushin、A. A. Rempel
DOI:10.1039/c5gc00753d
日期:——
In this paper we wish to report a highly selective and benign method for the double C-H/C-H coupling of azaaromatics with indoles or pyrrole in the presence of air oxygen/TiO2,...
Identification of N‐ or O‐Alkylation of Aromatic Nitrogen Heterocycles and
<i>N</i>
‐Oxides Using
<sup>1</sup>
H–
<sup>15</sup>
N HMBC NMR Spectroscopy
作者:Kevin J. Sheehy、Lorraine M. Bateman、Niko T. Flosbach、Martin Breugst、Peter A. Byrne
DOI:10.1002/ejoc.202000329
日期:2020.6.16
1H–13C HMBC and 13C1H} NMRspectroscopy has been developed that allows unambiguous diagnosis of the occurrence of N‐ or O‐alkylation of aromatic N‐heterocycles and N ‐oxides. A systematic large upfield shift inthe 15N NMR chemical shift is shown to be characteristic of N‐alkylation of aromatic N‐heterocycles (Δ(δN) ≈ –100 ppm). A much smaller systematic change in δN is indicative of N ‐oxide O‐alkylation
已经开发了一种基于1 H- 15 N,1 H- 13 C HMBC和13 C 1 H} NMR光谱的分析方法,可以明确诊断芳族N-杂环和N的N-或O-烷基化的发生氧化物。一个系统的大高磁场位移在矿井15 ÑNMR化学位移被示出为芳族的N-杂环的N-烷基化的特性(Δ(δ Ñ)≈-100 ppm)表示。在δ甲小得多系统性变化Ñ指示Ñ氧化物O-烷基化(约-40 ppm)表示。
An alternative method to access diverse N,N′-diquaternised-3,3′-biquinoxalinium “biquinoxen” dications
作者:Nicolas Leblanc、Stephen Sproules、Annie K. Powell
DOI:10.1039/c7nj00531h
日期:——
An alternative synthetic route for the design of N,N′-diquaternised-3,3′-biquinoxalinium “biquinoxen” dications is reported, involving oxidative radical coupling of dithionite reduced quinoxaline quaternary salts. Although the reaction is not regioselective, leading to relatively modest yields (up to 32%), the advantages of this new synthetic protocol lie in a simple potentially gram scale synthesis
Approaching the limit of Cu<sup>II</sup>/Cu<sup>I</sup> mixed valency in a Cu<sup>I</sup>Br<sub>2</sub>–N-methylquinoxalinium hybrid compound
作者:Nicolas Leblanc、Stephen Sproules、Claude Pasquier、Pascale Auban-Senzier、Helene Raffy、Annie K. Powell
DOI:10.1039/c5cc04142b
日期:——
We present a novel 1D hybrid salt (MQ)[CuBr2]∞ (MQ = N-methylquinoxalinium) containing less than 0.1% CuII and yet shows properties consistent with a mixed valent structure.