Stereoselective Sc(OTf)3‐Catalyzed Aldol Reactions of Disubstituted Silyl Enol Ethers of Aldehydes with Acetals

Facile and modular access to stereodefined disubstituted aldehyde‐derived silyl enol ethers allowed their successful application in a stereoselective aldol reaction affording the products with excellent yields and diastereomeric ratios. The counter‐intuitive stereochemical behavior of this Mukaiyama‐aldol reaction is accounted for by a non‐classical open transition state. Facile and modular access to stereodefined disubstituted aldehyde‐derived silyl enol ethers allowed their successful application in a stereoselective aldol reaction affording the products with excellent yields and diastereomeric ratios. The counter‐intuitive stereochemical behavior of this Mukaiyama‐aldol reaction is accounted for by a non‐classical open transition state.