通过Barton-Kellogg反应成功合成了在苯基对位上具有吸电子和供电子取代基(H,MeO,Ph,NO 2,Br,F)的(N-苯基芴基)ac啶烷(Ph-FA)化合物的ñ -芳基thioacridones和diazofluorene。通过使用氮原子上的取代基改变电子性质,p- NO 2 -C 6 H 4的折叠和扭曲构象异构体-FA可以进行晶体学表征,从而可以使电荷从供电子a啶部分转移到受电子芴基部分。在构象体的折叠和扭曲构象之间证实了基态机械变色,热变色,气相变色和质子诱导的变色。Ph-FA的质子化和化学氧化产生了两个稳定的a啶化合物,即芴基rid啶鎓和a啶鎓自由基阳离子。本研究将有助于功能性染料和有机半导体的发展。
Copper‐catalyzed synthesis of
<i>N</i>
‐aryl acridones from 2‐amino benzophenones and aryl boronic acids via sequential double oxidative C–N coupling
作者:Yang He、Liang Xu、Jinli Zhang、Yu Wei
DOI:10.1002/aoc.5316
日期:2020.2
Pot‐economic synthesis of N‐aryl acridones was performed with 2‐aminobenzophenones and aryl boronic acids as starting materials. Cu‐catalyzed chelation‐assisted oxidative C–N cross‐coupling reactions were well merged with the following intra‐molecular oxidative dehydrogenative C–H amination reactions under an air atmosphere. The use of reagent capsules can further resolve the compatibility problem
Copper-catalyzed intramolecular direct amination of sp2 C–H bonds for the synthesis of N-aryl acridones
作者:Wang Zhou、Yong Liu、Youqing Yang、Guo-Jun Deng
DOI:10.1039/c2cc35425j
日期:——
A copper-catalyzed approach for the synthesis of N-arylacridones via sp(2) C-H bond amination using air as oxidant under neutral conditions is disclosed. This reaction not only provides a complementary method for synthesizing medicinally important acridones, but also offers a new strategy for sp(2) C-H bond amination.
Merging Two Functions in a Single Rh Catalyst System: Bimodular Conjugate for Light-Induced Oxidative Coupling
作者:Jinwoo Kim、Dongwook Kim、Sukbok Chang
DOI:10.1021/jacs.0c09982
日期:2020.11.11
A single molecular rhodium catalyst system (PC2-Cp#RhIII) bearing two functional domains for both photosensitization and C-H carbometalation was designed to enable an intramolecular redox process. The hypothesized charge-transfer species (PC2•--Cp#RhIV) was characterized by spectroscopic and electrochemical analyses. This photoinduced internal oxidation allows a facile access to the triplet state of the key post-transmetalation intermediate that readily undergoes C-C bond-forming reductive elimination with a lower activation barrier than in its singlet state, thus enabling catalytic C-H arylation and methylation processes.