Synthesis of Cyclic Dienamide Using Ruthenium-Catalyzed Ring-Closing Metathesis of Ene-Ynamide

Abstract
Ring-closing metathesis of ene-ynamide using the second-generation Grubbs’ catalyst produced nitrogen-containing heterocycles, which have dienamide moieties, in high yields. Diels−Alder reaction of the cyclized product and dienophile proceeded smoothly to afford a bi- or tricyclic compound.