Resolution of racemic carboxylic acid derivatives by Ti-TADDOLate mediated esterification reactions—A general method for the preparation of enantiopure compounds
作者:Dieter Seebach、Georg Jaeschke、Konstanze Gottwald、Keiji Matsuda、Roberto Formisano、David A Chaplin、Matthias Breuning、Gerhard Bringmann
DOI:10.1016/s0040-4020(97)00456-0
日期:1997.6
transfer of an alkoxide ligand from the chiral ligand sphere of Ti-TADDOLates 1 to cyclic carboxylic acid derivatives is described. The kinetic resolution of dioxolanones, azlactones and biaryl lactones by the Ti-TADDOLates affords, after recrystallization, ester products in highly enantioenriched form (er ≥ 97:3). The enantiomer-differentiating ring-opening of a chiral cyclic anhydride by a Ti-TADDOLate
描述了路易斯酸介导的醇盐配体从Ti-TADDOLates 1的手性配体球到环状羧酸衍生物的转移。Ti-TADDOLates可以动力学拆分二恶唑酮,氮杂内酯和联芳基内酯,重结晶后可得到高度对映体富集形式的酯产物(er≥97:3)。Ti-TADDOLate可以使手性环酐的对映异构体开环反应高度对映选择性地产生两个结构异构体。