Kinetic Resolution of Racemic Carboxylic Acids through Asymmetric Protolactonization Promoted by Chiral Phosphonous Acid Diester
作者:Masayuki Sakuma、Akira Sakakura、Kazuaki Ishihara
DOI:10.1021/ol401313d
日期:2013.6.7
salts induce the kinetic resolution of racemic α-substituted unsaturated carboxylic acids through asymmetric protolactonization. Both the lactones and the recovered carboxylic acids are obtained with high enantioselectivities and high S (= kfast/kslow) values. Asymmetric protolactonization also leads to the desymmetrization of achiral carboxylic acids. Notably, chiral phosphonous acid diester not only
手性phospho盐通过不对称的原内酯化诱导外消旋α-取代的不饱和羧酸的动力学拆分。内酯和回收的羧酸均具有高对映选择性和高S(= k fast / k slow)值。不对称的原内酯化也导致非手性羧酸的去对称化。值得注意的是,手性亚膦酸二酯不仅诱导了对映选择性,而且还促进了原内酰胺化。