An asymmetric multicomponent, interrupted Kinugasa allylic alkylation (IKAA) reaction has been developed with a synergistic Cu‐catalyzed Kinugasa system and a Pd‐catalyzed allylic alkylation reaction. This unprecedented reaction provides in high yields and with high stereoselectivity a synthesis of α‐quaternary chiral β‐lactams, which cannot be produced with existing synthetic methods. Stereoselective coupling of two catalytic amounts of transient organometallic intermediates formed in situ is an important feature of this reaction. An asymmetric multicomponent interrupted Kinugasa allylic alkylation (IKAA) reaction has been developed with a synergistic Cu‐catalyzed Kinugasa and Pd‐catalyzed allylic alkylation system. This strategy provides a high yield and highly selective synthesis of α‐quaternary chiral β‐lactams, which are not easily produced by other methods. Stereoselective coupling of two transient organometallic intermediates formed in situ is the most important feature of this reaction.