Carboxylate Switch between Hydro- and Carbopalladation Pathways in Regiodivergent Dimerization of Alkynes
作者:Olga V. Zatolochnaya、Evgeniy G. Gordeev、Claire Jahier、Valentine P. Ananikov、Vladimir Gevorgyan
DOI:10.1002/chem.201402809
日期:2014.7.28
regiodivergent palladium‐catalyzed dimerization of terminalalkynes is presented. Employment of N‐heterocyclic carbene‐based palladium catalyst in the presence of phosphine ligand allows for highly regio‐ and stereoselective head‐to‐head dimerization reaction. Alternatively, addition of carboxylate anion to the reaction mixture triggers selective head‐to‐tail coupling. Computational studies suggest that reaction