Copper-Catalyzed Direct Amination of 1,2,3-Triazole<i>N</i>-Oxides by C-H Activation and C-N Coupling
作者:Jiayi Zhu、Yubo Kong、Feng Lin、Baoshuang Wang、Zhengwang Chen、Liangxian Liu
DOI:10.1002/ejoc.201403583
日期:2015.3
An efficient approach for the synthesis of 4-amino-2-aryl-1,2,3-triazole derivatives has been developed through the copper-catalyzed direct C–H amination of 2-aryl-1,2,3-triazole N-oxides under mild reaction conditions. Various amines, including primary and secondary aliphatic and aromatic amines, can be employed as effective coupling partners. The general performance of our method was also demonstrated
Palladium-catalyzed oxidative CH/CH cross-coupling of pyridine <i>N</i>-oxides with five-membered heterocycles
作者:Wei Liu、Xin Yu、Yahui Li、Chunxiang Kuang
DOI:10.1039/c4cc04129a
日期:——
Using Ag2CO3 as an additive, we developed the Pd-catalyzed intermolecular C-H/C-H cross-coupling of pyridine N-oxides with five-membered heterocycles such as 1-benzyl-1,2,3-triazoles, thiophens and furans. This protocol provides an efficient and regioselective approach for the synthesis of unsymmetrical biheteroaryl molecules.
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
Palladium-Catalyzed Olefination and Arylation of 2-Substituted 1,2,3-Triazole <i>N</i>-Oxides
作者:Wei Liu、Yahui Li、Bo Xu、Chunxiang Kuang
DOI:10.1021/ol401002w
日期:2013.5.17
Two highly efficient protocols for the regioselective synthesis of 2-substituted 4-alkenyl- and 4-aryl-1,2,3-triazoles by the palladium-catalyzed C–H functionalization of 1,2,3-triazoleN-oxides are reported. A possible pathway of direct alkenylation with 1-octene and vinyl acetate is discussed.
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.