Asymmetric Aldol-type Reaction between Both Achiral Ketene Silyl Acetals and Aldehydes by the Use of a Chiral Promoter

Abstract
Highly enantioselective aldol-type reaction of achiral ketene silyl acetals with achiral aldehydes is carried out by the use of a chiral promoter, a combined use of chiral diamine coordinated tin(II) triflate and tributyltin fluoride.