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
发现 α-锂硫芳基甲基亚砜与有限量的手性羧酸盐 (R2-CO-O-R*) 的反应是对映异构体区分反应,提供相应的光学活性 β-酮亚砜 (3),一起具有相反构型的旋光芳基甲基亚砜。获得的 3 的光学纯度和主要构型通过极化分析和 NMR 的组合指定。该反应的对映选择性程度受酯部分 R2 的性质影响,表明光学产率从 1.3%(其中 R2 为乙基(3b))增加到 70.3%,其中 R2 为叔丁基(3f) . 通过考虑六元环过渡态讨论了反应的立体化学过程。此外,