摘要
This paper describes the first case of a reductive coupling reaction with indene,a non-heteroatom olefin used as a reducing agent.The scope of the substrate is wide.The homo-coupling,cross-coupling,and synthesis of 12 and 14-membered rings were realized.The control experiment,indene-product curve and density functional theory calculations showed that the η^(3)-palladium indene intermediate was formed by C-H activation in the presence of cesium carbonate.We speculate that the final product was obtained through a Pd(IV)intermediate or aryl ligand exchange.In addition,we excluded the formation of palladium anion(Pd(0)^(-))intermediates.
基金
the National Natural Science Foundation of China(Nos.NSF22061038,NSF22067018)
the Long Yuan Youth Innovative Project of Gansu Province(No.2019-39)
the Northwest Normal University Young Scholars Research Capacity Improvement Program(No.NWNU-LKQN-2020-04)
Computations reported in this paper were performed on the computer clusters at the Centre for Scientific Modeling and Computation,CUHK.
