Acceptorless Dehydrogenation of <i>N</i>‑Heterocycles and Secondary Alcohols by Ru(II)-NNC Complexes Bearing a Pyrazoyl-indolyl-pyridine Ligand

Ruthenium­(II)
hydride complexes bearing a pyrazolyl-(2-indol-1-yl)-pyridine
ligand were synthesized and structurally characterized by NMR analysis
and X-ray single crystal crystallographic determinations. These complexes
efficiently catalyzed acceptorless dehydrogenation of N-heterocycles and secondary alcohols, respectively, exhibiting highly
catalytic activity with a broad substrate scope. The present work
has established a strategy to construct highly active transition metal
complex catalysts and provides an atom-economical and environmentally
benign protocol for the synthesis of aromatic N-heterocyclic
compounds and ketones.