Stereoselective Copper‐Catalyzed Direct Aldol Reaction of β, γ‐Unsaturated α‐Ketoesters with Coumaran‐3‐Ones.

An efficient direct aldol reaction between coumaran‐3‐ones and β, γ‐unsaturated α‐ketoesters by virtue of a chiral copper complex is developed. A series of coumaran‐3‐one derivatives containing chiral tertiary alcohol structures are obtained in excellent yields and stereoselectivities. [ABSTRACT FROM AUTHOR]