Simple and Efficient Asymmetric α‐Alkylation and α,α‐Bisalkylation of Acyclic Ketones by Using Chiral N‐Amino Cyclic Carbamate Hydrazones

Distinguishing left from right: In the title reactions, chiral N-amino cyclic carbamates (ACCs) substantially diminish the drawbacks associated with the use of chiral dialkyl hydrazines, yet provide excellent stereoselectivity and high yields. In addition, ACCs exhibit a unique directing effect that overrides the inherent selectivity of lithium diisopropylamide (LDA) and enables the asymmetric α,α-bisalkylation of ketones (see scheme).