Enantioselective Cross-Exchange between C?I and C?C σ Bonds

Article abstract of DOI:10.1002/anie.201902029

A palladium-catalyzed enantioselective intramolecular σ-bond cross-exchange between C?I and C?C bonds is realized, providing chiral indanones bearing an alkyl iodide group and an all-carbon quaternary stereocenter. Pd/TADDOL-derived phosphoramidite is found to be an efficient catalytic system for both C?C bond cleavage and alkyl iodide reductive elimination. In addition to aryl iodides, aryl bromides can also be used for this transformation in the presence of KI. Density-functional theory (DFT) calculation studies support the ring-opening of cyclobutanones occuring through an oxidative addition/reductive elimination process involving Pd^IV species.