(NHC)CuH-Catalyzed Entry to Allenes via Propargylic Carbonate SN2′-Reductions

The copper hydride-catatyzed S(N)2'-reduction of propargylic carbonates provides an efficient mute to functionalized allenes. The method takes advantage of the stabilizing effect of NHC ligands on CuH and combines high reactivity and stereoselectivity with excellent tolerance toward reactive functionalities.