Towards a rational design for resolving agents. Part V: Substituent effects in the resolution of ephedrine using a series of cyclic phosphoric acids
作者:Albertus D. van der Haest、Hans Wynberg、Frank J. J. Leusen、Alle Bruggink
DOI:10.1002/recl.19931120305
日期:——
aromatic substituents in both ephedrine and a cyclic phosphoric acid on the quality of resolution via diastereomeric salt formation are investigated. The diastereo-selective synthesis of a novel series of chloro-substituted ephedrines is described. These chloroephedrines can be resolved efficiently with some of the cyclic phosphoric acids. By studying the physical properties of nineteen pairs of diastereomeric