Highly Efficient and Simple Catalytic System for the N-Arylation of Some Hindered Aza-Heterocycles in Water
作者:Chhanda Mukhopadhyay、Pradip Kumar Tapaswi
DOI:10.1080/00397911.2011.555219
日期:2012.8.1
Abstract A highly efficient and simple protocol for the N-arylation of some hindered aza-heterocycles in water has been developed with readily available basic copper carbonate as the catalyst using bis(3,5-dimethyl-1H-pyrazol-1-yl)methane as ligand. This mild catalyticsystem possesses excellent tolerance for a large variety of functional groups. A total of 11 previously unknown coupling products have
Nucleophilic Aromatic Substitution of Unactivated Fluoroarenes Enabled by Organic Photoredox Catalysis
作者:Vincent A. Pistritto、Megan E. Schutzbach-Horton、David A. Nicewicz
DOI:10.1021/jacs.0c09296
日期:2020.10.7
use of organic photoredox catalysis renders this method operationally simple under mild conditions and is amenable to various nucleophile classes, including azoles, amines, and carboxylic acids. Select fluorinated heterocycles can be functionalized using this method. In addition, the late-stage functionalization of pharmaceuticals is also presented. Computational studies demonstrate that the site selectivity
Rhodium-catalyzed intermolecular hydroarylation of internal alkynes with N-1-phenylbenzotriazoles
作者:Wang Zhou、Youqing Yang、Zhiwei Wang、Guo-Jun Deng
DOI:10.1039/c3ob42007h
日期:——
A rhodium-catalyzed intermolecular hydroarylation of internal alkynes with N-1-phenylbenzotriazoles via C–H bond activation is described. This transformation offers an alternative method for the hydroarylation of internal alkynes with high stereoselectivity. The reaction mechanism was discussed according to the deuterium-labeling experiments.
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。
Mechanistic investigations on C–H activated dealkylating cyclo-amination reactions of substituted triazenes, formamidines and amidines
作者:Silvio Preusser、Diana Kalden、Felix Wendler、Paul R. W. Schönherr、Helmar Görls、Matthias Westerhausen、Wolfgang Imhof
DOI:10.1515/znb-2020-0067
日期:2020.8.27
varied to introduce potentially competing reaction sites and to investigate the reaction mechanism of the catalytic cyclization reactions. Yields of the benzotriazole synthesis strongly depend on the electronic and steric properties of the directing phosphane ligands, the nature of the dealkylating bases and the substitution pattern in 2- and 4-position of the aryl groups of the starting triazenes. In order
摘要 N 1-甲基化-N 1,N 3-二芳基化三氮烯的催化脱烷基化环胺化反应通过两个随后的氧化加成反应进行,区域选择性通过C-H和C-Br活化步骤产生苯并三唑。虽然在脱烷基试剂和导向磷烷配体存在下的钯基催化导致高产率,但同系金属镍和铂以及其他 3d 过渡金属在类似程序中仅表现出较差的催化活性。起始化合物已广泛变化以引入潜在的竞争反应位点并研究催化环化反应的反应机理。苯并三唑合成的产率很大程度上取决于导向磷烷配体的电子和空间特性,脱烷基碱的性质和起始三氮烯芳基的 2 位和 4 位取代模式。为了阐明催化剂的作用,鉴定了钯基中间体。最后,在相关的 C-H 活化脱烷基环胺化反应中测试了甲脒和大脒。图形概要