申请人:Hoechst Aktiengesellschaft
公开号:US04668796A1
公开(公告)日:1987-05-26
The invention relates to a process for resolving racemic mixtures of bicyclic imino-.alpha.-carboxylic esters into the components by crystallization of diastereomeric salts, which comprises preparing the salts of the racemic esters with optically active N-acylated R- or S-aminocarboxylic acid which contain a phenyl nucleus, recrystallizing them from an organic solvent, decomposing the precipitated, optically homogeneous diastereomeric salts in a manner known per se, and isolating the enantiomers and, where appropriate, converting the latter into the free acids by hydrolysis in a manner known per se. The invention also relates to optically pure compounds of the formula ##STR1## and to diastereomeric salts of these compounds, in which two of the radicals A, B.sup.1, B.sup.2 and C form a carbon chain and the others denote hydrogen, and R is an esterifying group.
该发明涉及一种用于通过结晶二对映异构盐将二环亚胺-α-羧酸酯的混合物分解为组分的过程,其包括以下步骤:用具有苯核的光学活性N-酰化的R-或S-氨基羧酸制备混合物的盐,从有机溶剂中重新结晶它们,按照已知的方法分解沉淀的光学均一的二对映异构盐,并分离对映异构体,并在必要时按照已知的方法将其转化为自由酸。该发明还涉及公式##STR1##的光学纯化合物,以及这些化合物的二对映异构盐,其中A、B.sup.1、B.sup.2和C中的两个基团形成碳链,其他基团表示氢,R是酯化基团。