Facile route for N1-aryl benzotriazoles from diazoamino arynes via CuI-mediated intramolecular N-arylation
摘要:
A facile and high-yielding protocol for diverse benzotriazoles through intramolecular N-arylation of different o-chloro-1,2,3-benzotriazenes using Cul/Cs2CO3 has been developed. (C) 2010 Elsevier Ltd. All rights reserved.
Electrophotocatalysis with a Trisaminocyclopropenium Radical Dication
作者:He Huang、Zack M. Strater、Michael Rauch、James Shee、Thomas J. Sisto、Colin Nuckolls、Tristan H. Lambert
DOI:10.1002/anie.201906381
日期:2019.9.16
electrophotocatalytic oxidation platform. This chemistry employs a trisaminocyclopropenium (TAC) ion catalyst, which is electrochemically oxidized to form a cyclopropenium radical dication intermediate. The radical dication undergoes photoexcitation with visible light to produce an excited-state species with oxidizing power (3.33 V vs. SCE) sufficient to oxidize benzene and halogenated benzenes via single-electron
可见光光催化和电催化是促进化学反应的两种强大策略。在这里,这两种模式结合在电光催化氧化平台中。该化学过程采用三氨基环丙烯 (TAC) 离子催化剂,通过电化学氧化形成环丙烯自由基阳离子中间体。自由基阳离子在可见光下进行光激发,产生具有氧化能力(3.33 V vs. SCE)的激发态物质,足以通过单电子转移(SET)氧化苯和卤代苯,从而导致 CH/NH 与唑类偶联。提供了光激发物质的强氧化行为的基本原理,同时通过顺式2,6-二甲基哌啶部分的特定构象合理化了催化剂的稳定性。
Cu-catalyzed arylation of 1-acyl-1H-1,2,3-Benzotriazoles via C–N activation
作者:Wenying Zhang、Yangyang Wang、Xiangru Jia、Zhengyin Du、Ying Fu
DOI:10.1016/j.jorganchem.2019.05.013
日期:2019.9
An efficient copper-catalyzed arylationreaction of 1-acyl-1H-1,2,3-benzotriazoles with diaryliodonium salts via C–N activation is explored. The reaction is conducted regioselectively to form 1-aryl-1H-1,2,3-benzotriazoles in MeCN at 80 °C in the presence of cesium carbonate. 29 examples are given with the product yield of up to 84%. The probable reaction mechanism is proposed.
通过CN活化研究了1-酰基-1 H -1,2,3-苯并三唑与二芳基碘鎓盐的有效铜催化芳基化反应。在碳酸铯存在下,于80℃在MeCN中区域选择性地进行反应以形成1-芳基-1 H -1,2,3-苯并三唑。给出了29个实例,产品收率高达84%。提出了可能的反应机理。
Synthesis of functionized N-arylbenzotriazoles via palladium catalyzed intramolecular amination
The functionalized benzotriazoles are prepared by palladium catalyzed intramolecularamination of 2-bromodiaryltriazene. By screening the reaction conditions, such as ligand, solvent, base and reaction concentration, the optimal reaction conditions were obtained, and 28 functionalized benzotriazole derivatives were successfully prepared up to 99% yield. The method is easy to operate and has good tolerance