Metal‐Free Radical 2+2+1 Carbocyclization of Benzene‐Linked 1,n‐Enynes: Dual C(sp3)H Functionalization Adjacent to a Heteroatom

A new metal-free oxidative radical 2+2+1 carbocyclization of benzene-linked 1,n-enynes with two C(sp(3))-H bonds adjacent to the same heteroatom is described. This method achieves two C(sp(3))-H oxidative functionalizations and an annulation, thus providing efficient and general access to a variety of fused five-membered carbocyclic hydrocarbons.