Route to Benzo- and Pyrido-Fused 1,2,4-Triazinyl Radicals via <i>N</i>′-(Het)aryl-<i>N</i>′-[2-nitro(het)aryl]hydrazides
作者:Andrey A. Berezin、Georgia Zissimou、Christos P. Constantinides、Yassine Beldjoudi、Jeremy M. Rawson、Panayiotis A. Koutentis
DOI:10.1021/jo402481t
日期:2014.1.3
involves the N′-(2-nitroarylation) of easily prepared N′-(het)arylhydrazides via nucleophilic aromatic substitution of 1-halo-2-nitroarenes, which in most cases gives N′-(het)aryl-N′-[2-nitro(het)aryl]hydrazides in good yields. Mild reduction of the nitro group followed by an acid-mediated cyclodehydration gives the fused triazines, which upon alkali treatment afford the desired radicals. Fifteen examples
A series of 3-substituted 1-phenyl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yls 1 was prepared by addition of PhLi to 3-substitutedbenzo[e][1,2,4]triazines 2 followed by aerial oxidation. The scope of the C(3) substituents in the reaction was investigated, and 10 structurally diverse radicals 1 were isolated, their stability was assessed and properties were investigated with spectroscopic and electrochemical
Preparation of Blatter Radicals via Aza-Wittig Chemistry: The Reaction of <i>N</i>-Aryliminophosphoranes with 1-(Het)aroyl-2-aryldiazenes
作者:Anastasia C. Savva、Styliana I. Mirallai、Georgia A. Zissimou、Andrey A. Berezin、Marina Demetriades、Andreas Kourtellaris、Christos P. Constantinides、Constantinos Nicolaides、Theodossis Trypiniotis、Panayiotis A. Koutentis
DOI:10.1021/acs.joc.7b01297
日期:2017.7.21
preheated diphenyl ether at ca. 150–250 °C for 5–25 min affords in most cases the 1,3-diaryl-1,4-dihydrobenzo[e][1,2,4]triazin-4-yls (aka Blatter radicals) in moderate to good yields. All new compounds are fully characterized, including EPR and CV studies for the radicals. Single-crystal X-ray structures of 1-benzoyl-2-(perfluorophenyl)diazene and 1-(perfluorophenyl)-3-phenyl-1,4-dihydrobenzo[e][1,2,4]triazinyl
反应Ñ -aryliminophosphoranes与1-(杂)中在约预热二苯醚芳酰基-2- aryldiazenes 在大多数情况下,在150–250°C下进行5–25分钟,可以得到中等至良好的1,3-二芳基-1,4-二氢苯并[ e ] [1,2,4]三嗪4基(又名Blatter自由基)产量。所有新化合物均经过充分表征,包括对基团的EPR和CV研究。还提出了1-苯甲酰基-2-(全氟苯基)二氮杂和1-(全氟苯基)-3-苯基-1,4-二氢苯并[ e ] [1,2,4]三嗪基的单晶X射线结构。
Electronic effects in profluorescent benzotriazinyl radicals: a combined experimental and theoretical study
作者:Jessica Exner、Iván Maisuls、Anja Massolle、Sina Klabunde、Michael R. Hansen、Cristian A. Strassert、Johannes Neugebauer、Hellmut Eckert、Armido Studer
DOI:10.1039/d0cp05732k
日期:——
benzotriazinyl radicals and their styryl radical trapping products are presented. The benzotriazinyl radicals are non-luminescent but surprisingly the corresponding styryl radical trapping products exhibit high fluorescence quantum yields (up to 60% in some cases), making them highly valuable probes or labels. Additionally, the influence of the substitution pattern on the optical properties of the radical trapping
Catalytic Oxidation of N-Phenylamidrazones to 1,3-Diphenyl-1,4-dihydro-1,2,4-benzotriazin-4-yls: An Improved Synthesis of Blatter’s Radical
作者:Panayiotis Koutentis、Daniele Lo Re
DOI:10.1055/s-0029-1218782
日期:2010.6
Blatter’s radical, 1,3-diphenyl-1,4-dihydro-1,2,4-benzotriazin-4-yl (1a, R = H), and several of its C-7 substituted analogues (R = CF3, Cl, Br, I, Me, OMe) were prepared in good-to-excellent yields through catalytic oxidation of the corresponding amidrazones by using palladium-on-carbon (1.6 mol%) and 1,8-diazabicyclo[5.4.0]undec-7-ene (0.1-1.0 equiv) in air. The reaction conditions were suitable for the preparation of Blatter’s radical on a one-gram scale in up to 87% yield.