Isolation of Ruthenium–Indolizine Complexes: Insight into the Metal-Induced Cycloisomerization of Propargylic Pyridines
摘要:
A class of ruthenium-indolizine complexes was isolated and structurally characterized, and they represent the first examples of metalated indolizine species. Both experimental and theoretical investigations on the formation of these complexes support a 5-endo-dig cyclization mechanism and discount a vinylidene-5-exo-dig cyclization pathway.