The Preparation of Optically Active β-Keto Sulfoxides by Means of an Enantiomer-differentiating Reaction of α-Lithio Aryl Methyl Sulfoxides with Chiral Carboxylates
作者:Norio Kunieda、Akira Suzuki、Masayoshi Kinoshita
DOI:10.1246/bcsj.54.1143
日期:1981.4
The reaction of α-lithio aryl methyl sulfoxides with a limited amount of chiral carboxylates (R2–CO–O–R*) was found to be an enantiomer-differentiating reaction, affording the corresponding optically active β-keto sulfoxides (3), together with optically active aryl methyl sulfoxides which have the opposite configuration. The optical purity and the predominant configuration of 3 obtained were assigned
Treatment of (−)-menthyl carboxylates(2) with 2 equiv of p-tolylsulfinylcarbanion(1) afforded the corresponding opticallyactive β-keto sulfoxides(3) together with opticallyactivemethyl p-tolyl sulfoxide. The enantiomeric purity and the predominant configuration of the products were discussed.