We have developed a method for the direct sulfonamidation of 2‐aryl‐1,2,3‐triazole N‐oxides using sulfonyl azides as the amino source to release molecular nitrogen as the sole by‐product. This protocol exhibits excellent functional group tolerance and proceeds efficiently underexternaloxidant‐freeconditions. Various 2‐(2‐sulfonamidoaryl)‐1,2,3‐triazoles were prepared in up to 97% yields for 25 examples
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.
The thermolysis of polyazapentadienes. Part 1. 1,5-Diaryl-1,2,5-triazaderivatives
作者:Hamish McNab
DOI:10.1039/p19800002200
日期:——
Flash vacuum pyrolysis of the title compounds at 600 °C gives quinoxalines and arylamines, together with small quantities of nitrites, diarylamines, azobenzenes, and formamidines. The mechanism involves homolytic cleavage of the N–N bond to generate a conjugated iminyl radical, which can either cyclise to a quinoxaline, or fragment to simpler radicals which lead to the minor products by coupling reactions