Synthesis of 9-arylalkynyl- and 9-aryl-substituted benzo[<i>b</i>]quinolizinium derivatives by Palladium-mediated cross-coupling reactions
作者:Siva Sankar Murthy Bandaru、Darinka Dzubiel、Heiko Ihmels、Mohebodin Karbasiyoun、Mohamed M A Mahmoud、Carola Schulzke
DOI:10.3762/bjoc.14.161
日期:——
9-Arylbenzo[b]quinolizinium derivatives were prepared with base-free Suzuki-Miyaura coupling reactions between benzo[b]quinolizinium-9-trifluoroborate and selected benzenediazonium salts. In addition, the Sonogashira coupling reaction between 9-iodobenzo[b]quinolizinium and the arylalkyne derivatives yielded four novel 9-(arylethynyl)benzo[b]quinolizinium derivatives under relatively mild reaction
Fluorimetric detection of Mg2+ and DNA with 9-(alkoxyphenyl)benzo[b]quinolizinium derivatives
作者:Maoqun Tian、Heiko Ihmels、Shite Ye
DOI:10.1039/c2ob06948b
日期:——
solutions. In contrast, the viscosity of the medium does not influence the emission properties of the parent phenyl-substituted benzo[b]quinolizinium 2e and of the p-methoxyphenyl-substituted derivative 2d. Based on these observations it is concluded that the excited-state deactivation in 2a–c is mainly due to the rotation of the m-alkoxy group about the Car–O bond. The interaction of 2a–c with DNA or Mg2+
提出了一种苯并[ b ]喹啉鎓-苯并-15-冠-5醚共轭物2a,它能够通过显着的光效应进行荧光检测Mg 2+和DNA,并且随着不同分析物的发射波长的变化( Mg 2+:495nm; DNA:550nm。在不同粘度的介质中,通过稳态荧光光谱研究了2a的激发态失活机理,并与甲氧基苯基取代的苯并[ b ]喹啉鎓2b(m,p -diOMe),2c(m -OMe)和2d(p -OMe)作为参考化合物。化合物2a-c中,它们共享的米-烷氧基苯基取代基作为共同的特点,具有低的发射量子产率(Φ ˚F <10 -2,在水中),但表现出它们的荧光强度的粘性甘油溶液一个显著增加。相反,介质的粘度不影响母体苯基取代的苯并[ b ]喹啉鎓2e和对甲氧基苯基取代的衍生物2d的发射性质。基于这些观察,得出的结论是2a–c中的激发态失活主要是由于所述的旋转米关于C -烷氧基芳-O键。分光光度滴定法和CD光谱法研究了2a–c与DNA或Mg
9-Nitrobenzo[<i>b</i>]quinolizinium as a fluorogenic probe for the detection of nitroreductase <i>in vitro</i> and in <i>Escherichia coli</i>
作者:Peter Jonas Wickhorst、Heiko Ihmels、Melanie Marianne Lammert-Baumgartner、Mareike Müller、Holger Schönherr
DOI:10.1039/d1nj05230f
日期:——
The non-fluorescent 9-nitrobenzo[b]quinolizinium is readily reduced by nitroreductase to a fluorescent reaction product. The resulting light-up effect enables the selective detection of nitroreductase activity in vitro and in Escherichia coli bacterial cultures.
无荧光的 9-硝基苯并[ b ]喹啉鎓很容易被硝基还原酶还原成荧光反应产物。由此产生的点亮效应能够在体外和大肠杆菌细菌培养物中选择性检测硝基还原酶活性。
Synthesis of fluorosolvatochromic phenanthrenyl-substituted benzoquinolizinium derivatives