ChemInform Abstract: Stereocontrolled Construction of 3,4‐Dihydrocoumarin Scaffolds with a Quaternary Amino Acid Moiety via Chiral Squaramide‐Catalyzed Cascade Michael Addition/Lactonization Reaction.

Abstract The asymmetric tandem Michael addition‐lactamization reaction between ortho‐nitro vinylphenols and azalactones affords dihydrocoumarin derivatives with excellent diastereo‐ and enantioselectivities.