Tributyltin hydride when reacted with a series of substituted azoarenes afforded hydrazo compounds with high chemoselectivity and good to high yields. With ortho-substituted azoarenes, mixtures of hydrazo derivatives and N-heterocycles or cyclic products only were obtained. The kinetic law of the process was determined in the presence and in the absence of AIBN; with the radical initiator the reaction proceeds via a radical chain mechanism, whereas without AIBN the presence of stannyl free radicals could be discarded. The mechanism of the noninitiated reaction is discussed. EPR characterization of spin adducts obtained by reacting group IVB organometallic radicals with azo compounds is reported.
Transition Metal-Free Oxidative Coupling of Primary Amines in Polyethylene Glycol at Room Temperature: Synthesis of Imines, Azobenzenes, Benzothiazoles, and Disulfides
作者:Abhinandan D. Hudwekar、Praveen K. Verma、Jaspreet Kour、Shilpi Balgotra、Sanghapal D. Sawant
DOI:10.1002/ejoc.201801610
日期:2019.2.14
A transition metal‐free protocol has been developed for the oxidativecoupling of primary amines to imines and azobenzenes, thiols to disulfides, and 2‐aminothiophenols to benzothiazoles, offering excellent yields. The advantageous features of the present environmentally benign methodology include the usage of biocompatable and green reaction conditions such as solvent, room temperature reactions,
A General Method to Diverse Cinnolines and Cinnolinium Salts
作者:Dongbing Zhao、Qian Wu、Xiaolei Huang、Feijie Song、Taiyong Lv、Jingsong You
DOI:10.1002/chem.201300155
日期:2013.5.10
Rhodium catalysis: A highly efficient and general method has been established to prepare cinnolines, cinnolinium salts, and polycyclic cinnolinium salts through the rhodium(III)‐catalyzed oxidative CHactivation/cyclization of azo compounds with alkynes (see scheme). Key features of this methodology include the unprecedented capacity to create both cinnoline and cinnolinium frameworks.
Study on the Isomerization of Amphiphilic Azobenzene Cored Dendrimer and Its Molecular Environment
作者:Michitaka Mamiya、Shun Fukushima、Tatsuo Arai
DOI:10.1246/bcsj.20180089
日期:2018.9.15
3,3′,5,5′-tetramethoxy azobenzene (TMAB) and amphiphilic azobenzene dendrimers (AGn-azo) bearing triethylene glycol were synthesized and their isomerization behavior investigated. The solvation str...
Rh(III)-Catalyzed Synthesis of Indazolo[2,3-<i>a</i>]quinolines: Vinylene Carbonate as C1 and C2 Building Blocks
作者:Wei Hu、Chao Pi、Di Hu、Xiliang Han、Yangjie Wu、Xiuling Cui
DOI:10.1021/acs.orglett.2c00580
日期:2022.4.15
rhodium-catalyzed cyclization of azobenzenes and vinylene carbonate via C–H bond activation to construct indazolo[2,3-a]quinolines has been developed. This protocol offers an efficient method for synthesis of the titled products in good yields with broad functional group tolerance. In this reaction, three C–C bonds and C–N bond are formed in one pot, and vinylene carbonate (VC) acts as C1 and C2 synthons as well as
铑催化偶氮苯和碳酸亚乙烯酯通过C-H键活化环化制备吲唑并[2,3- a ]喹啉。该协议提供了一种有效的方法来合成具有广泛功能组耐受性的高产量的标题产品。在这个反应中,三个C-C键和C-N键在一锅中形成,并且碳酸亚乙烯酯(VC)作为C1和C2合成子以及“亚乙烯基转移”剂和酰化剂构建目标融合杂环。此外,这些产品表现出良好的荧光特性,表明它们具有作为荧光材料和生物传感器的潜在应用。
Tributyltin hydride when reacted with a series of substituted azoarenes afforded hydrazo compounds with high chemoselectivity and good to high yields. With ortho-substituted azoarenes, mixtures of hydrazo derivatives and N-heterocycles or cyclic products only were obtained. The kinetic law of the process was determined in the presence and in the absence of AIBN; with the radical initiator the reaction proceeds via a radical chain mechanism, whereas without AIBN the presence of stannyl free radicals could be discarded. The mechanism of the noninitiated reaction is discussed. EPR characterization of spin adducts obtained by reacting group IVB organometallic radicals with azo compounds is reported.