Pd-Catalyzed Oxidative CH/CH Direct Coupling of Heterocyclic N-Oxides
摘要:
A highly efficient protocol for C-H/C-H cross-coupling has been found to occur between 2-aryl-1,2,3-triazole N-oxides and pyridine N-oxide derivatives. In addition, two homocoupling reactions of 2-substituted 1,2,3-triazole N-oxides and some pyridine N-oxide derivatives were developed. A possible pathway of C-H/C-H direct coupling is discussed.
Room-temperature oxidative Suzuki coupling reaction of 1,2,3-triazole N -oxides
作者:Wei Liu、Yanyan Yu、Boyi Fan、Chunxiang Kuang
DOI:10.1016/j.tetlet.2017.06.051
日期:2017.7
4-disubstituted 1,2,3-triazoles through regioselective direct arylation between 2-aryl-1,2,3-triazole N-oxides and Ar-B(OH)2. The reaction proceeds smoothly at room temperature and exhibits good yield and high C5 position selectivity. The possible pathway of oxidative Suzukicoupling is also discussed. This simple methodology can be used to construct 2,4-disubstituted 1,2,3-triazole moiety.
Site-Selective Direct Arylation of 1,2,3-Triazole<i>N</i>-Oxides
作者:Wei Liu、Yahui Li、Yue Wang、Chunxiang Kuang
DOI:10.1002/ejoc.201300747
日期:2013.8
An efficient route for the synthesis of 2,4-disubstituted 1,2,3-triazoles by the regioselective direct arylation of 2-aryl-1,2,3-triazole N-oxides with Ar–X [X = Br, I and B(OH)2] is demonstrated. The reaction proceeds through Pd-catalyzed C–H bond activation, and the influence of the aryl halides on the reactivity is investigated.