bridged aromatic azo compounds (AAzos) from aromatic amines was developed by using red copper as catalyst. Despite numerous efforts towards the catalytic synthesis of symmetric and asymmetric AAzos derivatives, most reactions present certain drawbacks inhibiting their industrial applications, such as laborious multi-step processes, harsh reaction conditions and expensive reagents. And the synthesis
Electrosynthesis of Azobenzenes Directly from Nitrobenzenes
作者:Yanfeng Ma、Shanghui Wu、Shuxin Jiang、Fuhong Xiao、Guo‐Jun Deng
DOI:10.1002/cjoc.202100470
日期:2021.12
The electrochemical reduction strategy of nitrobenzenes is developed. The chemistry occurs under ambient conditions. The protocol uses inert electrodes and the solvent, DMSO, plays a dual role as a reducing agent. Its synthetic value has been demonstrated by the highly efficient synthesis of symmetric, unsymmetric and cyclic azo compounds.
Oxidative Approach Enables Efficient Access to Cyclic Azobenzenes
作者:Martin S. Maier、Katharina Hüll、Martin Reynders、Bryan S. Matsuura、Philipp Leippe、Tongil Ko、Lukas Schäffer、Dirk Trauner
DOI:10.1021/jacs.9b08794
日期:2019.10.30
high-yielding protocol that relies on the oxidative cyclization of diani-lines. In combination with a modular substrate synthesis, it allows for rapid access to diversely functionalized diazocines on gram scales. Our work systematically explores substituent effects on the photoisomerization and thermal relaxation of diazocines. It will enable their incorporation into a wide variety of functional molecules
Photoisomerization-enhanced 1,3-dipolar cycloaddition of carbon-bridged octocyclic azobenzene with photo-released nitrile imine for peptide stapling and imaging in live cells
ring-strained NN double bond as a dipolarophile was discovered. The photo-isomerization of carbon-bridged octocyclic azobenzene (CBOA) into its trans-configuration accelerates the ligation reaction at a very rapid rate (28 400 M−1 s−1). The CBOA-based photo-click reaction was proved to be bioorthogonal. In addition, the NoxaB peptide was successfully cross-linked by a CBOA stapler which plays a dual role: photo-control
发现在腈亚胺和高度环应变的N N双键之间以光诱导的1,3-偶极环加成形式形成了亲极性。碳桥键合的八环偶氮苯(CBOA)的光异构化使其反式构型以非常快的速率(28 400 M -1 s -1)加速了连接反应。基于CBOA的光点击反应被证明是生物正交的。此外,NoxaB肽已被CBOA装订器成功交联,该装订器起着双重作用:光控制肽的构象和探针在活细胞中的光缀合。
Cross-Coupling Strategy for the Synthesis of Diazocines
作者:Shuo Li、Nadi Eleya、Anne Staubitz
DOI:10.1021/acs.orglett.0c00122
日期:2020.2.21
Ethylene bridged azobenzenes are novel, promising molecular switches that are thermodynamically more stable in the (Z) than in the (E) configuration, contrary to the linear azobenzene. However, their previous synthetic routes were often not general, and yields were poorly reproducible, and sometimes very low. Here we present a new synthetic strategy that is both versatile and reliable. Starting from