Enantio-, diastereo-, and regioselective iridium-catalyzed asymmetric allylic alkylation of acyclic ß-ketoesters.

The first regio-, diastereo-, and enantioselective allylic alkylation of acyclic ß-ketoesters to form vicinal tertiary and all-carbon quaternary stereocenters is reported. Critical to the successful development of this method was the employment of iridium catalysis in concert with N-aryl-phosphoramidite ligands. Broad functional group tolerance is observed at the keto-, ester-, and α-positions of the nucleophile. Various transformations demonstrating the utility of this method for rapidly accessing complex enantioenriched compounds are reported.