The asymmetric Povarov reaction with α‐alkyl styrenes as dienophiles was catalyzed by an N,N′‐dioxide L4–Sc(OTf)3 complex. Enantiopure tetrahydroquinoline derivatives with a quaternary stereocenter at the C4 position were synthesized for the first time. A wide variety of α‐alkyl styrenes and N‐aryl aldimines were tolerated in the reaction, to give excellent diastereo‐ (up to 99:1 d.r.) and enantioselectivities
An enantioselective bisvinylogous Mannich reaction of silyl ketene acetal with aldimines has been realized by using a chiral N,N′‐dioxide/Tm(OTf)3 complex as catalyst, providing an effective method to synthesize chiral ζ‐amino‐α,β,γ,δ‐unsaturated carbonyl compounds.