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.
NiSO<sub>4</sub>-catalyzed C–H activation/C–S cross-coupling of 1,2,3-triazole N-oxides with thiols
作者:Jiayi Zhu、Yu Chen、Feng Lin、Baoshuang Wang、Zhengwang Chen、Liangxian Liu
DOI:10.1039/c4ob02586e
日期:——
An efficient nickel-catalyzed protocol for C–S cross-coupling through the direct functionalization of 2-aryl-1,2,3-triazole N-oxide C–H bonds with aryl or alkyl thiols, or diphenyl disulfide has been developed. The targeted N+–O− bondcleavage can be observed during the reaction, and thus obviates the need to use an additional deoxygenation step. This new protocol for the preparation of thiolated 2-aryl-1
A novel strategy for rhodium‐catalyzed direct C‐H ortho‐alkylation of 2‐aryl‐1,2,3‐triazole N‐oxides with maleimides was reported. It proceeds with high atom efficiency, free external oxidant, excellent regioselectivity, and convenient on a gram‐scale.
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.