Ligand‐Enabled Chemo‐ and Regioselective Ir(I)‐Catalyzed Intermolecular Hydrocarbonation of Allenes: Access to Branched Products with All‐Carbon Quaternary Centers

An iridium complex featuring the perfluorinated bisphosphine ligand d F ppe can catalyze intermolecular hydrocarbonation reactions of allenes with precise control over the selectivity to yield highly valuable branched products instead of the more common linear derivatives. Using N ‐substituted 3‐carboxamide pyrroles as C─H donors, the reaction gives exclusively C‐4 substituted products, while furan analogues yield C‐2 substituted derivatives. β‐Unsubstituted acrylamides can also be used as C─H sources to give chiral skipped dienes. The additions are equally efficient using monosubstituted and 1,1‐disubstituted allenes, enabling the efficient formation of products bearing tertiary and all‐carbon quaternary stereocenters. Moreover, a preliminary analysis with chiral bisphosphinite ligands confirms the feasibility of an enantioselective variant. Computational (DFT) studies provide relevant insights into this remarkable ligand‐driven branched selectivity.