Enhancing Ligand‐Free Fe‐Catalyzed Aminocarbonylation of Alkynes by ZrF
<sub>4</sub>
作者:Zijun Huang、Yanan Dong、Yudong Li、Mohamed Makha、Yuehui Li
DOI:10.1002/cctc.201900995
日期:2019.11.7
Zirconium fluoride was utilized to promote efficiently iron‐catalyzed aminocarbonylation between alkynes and amines without the use of extra ligands. In particular, this new system is applicable to a wide range of amine and alkyne substrates affording α,β‐unsaturated amides in good to excellent yields. Preliminary mechanistic studies reveal the activation model involving interactions of ZF4 with both
and excellent yields. Mechanistic studies have disclosed that the reaction takes place via a palladium hydride pathway. CPP adopts a hybridbidentateligand conformation with a carbene–phosphine coordination mode, wherein one phosphorus atom remains externally accessible, potentially serving as a stabilizing auxiliary during catalytic cycles.