Diastereodivergent Construction of Bicyclic γ-Lactones via Enantioselective Ketone Hydroacylation.

We present a diastereodivergent strategy for constructing bicyclic γ-lactones bearing quaternary carbon centers via ketone hydroacylation. By applying a Rh catalyst and JoSPOphos ligand, either the anti or syn bicyclic γ-lactones can be accessed with high enantio- and diastereoselectivities, depending on the choice of solvent, temperature, and counterion. [ABSTRACT FROM AUTHOR]