Copper/Photoredox dual Catalyzed Syntheses of Allenenitriles via 1,5‐HAT.

The first example of merging photoredox catalysis and copper catalysis for 1,4‐difunctionalization of 1,3‐enynes via 1,5‐HAT (hydrogen atom transfer) has been developed. The synthetic strategy exploits a radical translocation from an oxygen‐centered to a carbon‐centered radical with a subsequent radical addition to the 1,3‐enynes, affording tetrasubstituted allenenitriles in up to 90% yield. This strategy has mild reaction conditions, broad substrate scope and excellent functional group tolerance. [ABSTRACT FROM AUTHOR]