Rhodium-catalysed conjugate addition of arylboronic acids to enantiopure dehydroamino acid derivatives

The rhodium-catalysed conjugate addition of arylboronic acids to an enantiopure acceptor derived from (R)-S-methylcysteine proceeds under substrate control to provide a range of functionalised phenylalanine derivatives with excellent stereocontrol via a highly diastereoselective protonation.