Annulation of α,β-Unsaturated Imines and Alkynes via Cobalt-Catalyzed Olefinic C–H Activation

Abstract

A cobalt-triarylphosphine catalyst promotes an annulation reaction of an α,β-unsaturated imine and an internal alkyne to afford a polysubstituted dihydropyridine derivative in good yield under mild conditions. The reaction likely involves alkenylation of the olefinic C-H bond via cobalt-mediated nitrogen-assisted C-H activation followed by facile 6π electrocyclization of the resulting azatriene intermediate.

Publication
Yamakawa, T.; Yoshikai, N. Org. Lett. 2013, 15, 196-199.