Well-defined dinuclear silver phosphine complexes based on nitrogen donor ligand and their high efficient catalysis for A3-coupling reaction

摘要

Graphical abstract A set of dinuclear silver(I) phosphine complexes containing substituted bispyridylpyrrole N^N^N ligand are prepared and fully characterized. Complex 1·OTf shows excellent catalytic efficiency for A3-coupling reaction under mild conditions, which is one of the most efficient catalysts reported for A3-coupling reaction. Display Omitted Highlights ? Novel bispyridylpyrrole nitrogen donor ligands are designed and synthesized. ? Novel dinuclear silver(I) complexes with substituted bispyridylpyrrole N^N^N ligand are presented. ? Complex 1·OTf shows excellent catalytic efficiency and cyclability for A3-coupling reaction under mild conditions. Abstract Nitrogen donor ligands HL1, HL3, HL4 and their silver complexes 1·OTf–4·OTf are prepared and fully characterized. Treatment of HL1-HL4 with AgOTf (OTf? =triflato) in presence of base Et3N and co-ligand PPh3 affords dinuclear Ag(I) complexes [Ag2(L)(PPh3)2]·OTf (L=L1 ?, 1·OTf; L=L2 ?, 2·OTf; L=L3 ?, 3·OTf; L=L4 ?, 4·OTf), respectively. The solid structure displays L acts as bis(bidentate) ligand, bridging between two Ag(I) centres. The Ag?Ag interaction as well as other weak interactions, such as Ag?Br