Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1984-01-30
1987-05-26
Hollrah, Glennon H.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
548492, C07D20902, C07D20918
Patent
active
046687963
ABSTRACT:
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.
Geiger Rolf
Langner Dietrich
Teetz Volker
Hoechst Aktiengesellschaft
Hollrah Glennon H.
Springer D. B.
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