Unimolecular tetrakis-piperidine-4-ol: an efficient ligand for copper and amine free Sonogashira coupling†
Abstract
A unimolecular tetrakis-piperidine-4-ol has been developed as an efficient ligand in combination with Pd/C for copper and amine free Sonogashira coupling. Various aryl and heteroaryl iodides were successfully coupled with aliphatic and aromatic alkynes to give internal alkynes in good to excellent yields.