Catalytic Cycloisomerization of Enynes by Using a Nickel-Zinc-Acid System

Copper-catalyzed cascade cyclization of 1,7-enynes with aromatic sulfonyl chlorides toward selective assembly of benzo[j]phenanthridin-6(5H)-ones

A new Cu-catalyzed cascade cyclization reaction of 1,n-enynes with aromatic sulfonyl chlorides using an alkenyl–Cu intermediate strategy is described.

Nickel-Catalyzed Cycloisomerization of Enynes: Catalyst Generation via C-H Activation of Carbene Ligands

The combination of Ni(0) and an N-heterocyclic carbene act as a precatalyst for the cycloisomerization of enynes to afford 1,3-dienes. During the course of the reaction, a nickel hydride is formed from oxidative addition of the ortho C-H on the carbene ligand. Deuteriumn labeling studies are presented.

Nickel-catalyzed coupling of allyl chlorides and enynes

The Ni-catalyzed coupling of allyl chlorides and enynes has been developed; the cyclization of enynes was triggered by the addition of pi-allylnickel species to the alkyne part, followed by the incorporation of the alkene part.