Regioselective and Redox‐Neutral Cp*IrIII‐Catalyzed Allylic C–H Alkynylation
2021
Herein, we report a Cp*IrIII -catalyzed highly regioselective and redox-neutral protocol for the construction of 1,4-enynes from unactivated olefins and bromoalkynes via intermolecular allylic C-H alkynylation. The developed mild reaction conditions tolerate a broad range of common functional groups, even enabling selective alkynylation of allylic C-H bonds in the presence of other prominent directing groups. Mechanistic experiments including the isolation of a catalytically active IrIII -allyl species support an intermolecular allylic C-H activation followed by an electrophilic alkynylation.
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