Rhodium(III)-Catalyzed Oxidative Coupling of 5-Aryl-1<i>H</i>-pyrazoles with Alkynes and Acrylates
作者:Xingwei Li、Miao Zhao
DOI:10.1021/jo201530r
日期:2011.10.21
[RhCp*Cl2]2-catalyzed oxidative coupling of 5-aryl-1H-pyrazoles with alkynes and acrylates has been achieved using Cu(OAc)2 as an oxidant. Coupling with alkynes afforded six-membered azacycles as a result of C–C and C–N coupling. Coupling with acrylates followed a process of diolefination and a subsequent aza-Michael cyclization.
Ruthenium-Catalyzed Alkyne Annulations with Substituted 1<i>H</i>-Pyrazoles by C–H/N–H Bond Functionalizations
作者:Wenbo Ma、Karolina Graczyk、Lutz Ackermann
DOI:10.1021/ol303083n
日期:2012.12.21
Cationic ruthenium(II) complexes allowed for highly efficient oxidative annulations of aryl- and alkyl-substituted alkynes by 5-aryl-1H-pyrazoles. The C-H/N-H bond functionalization strategy furthermore proved applicable to the high-yielding activation of heteroaryl as well as alkenyl C-H bonds.