High-performance liquid chromatographic enantioseparation of unusual amino acid derivatives with axial chirality on polysaccharide-based chiral stationary phases

Journal of Chromatography. a
Pilar López-Ram-de-VíuMaría D Díaz-de-Villegas

Abstract

The successful enantioseparation of axially chiral amino acid derivatives containing a cyclohexylidene moiety on an analytical and semipreparative scale was achieved for the first time by HPLC using polysaccharide-based chiral stationary phases. Racemic methyl N-benzoylamino esters, easily obtained by methanolysis of the corresponding 5(4H)-oxazolones, were subjected to chiral HPLC resolution using chiral stationary phases based on immobilized 3,5-dimethylphenylcarbamate derivatives of amylose (Chiralpak(®) IA column) or cellulose (Chiralpak(®) IB column). The behaviour of both selectors under different elution conditions was evaluated and compared. The amylose column showed better performance than the cellulose column for all enantiomers tested. The semipreparative resolution of axially chiral amino acid derivatives with different side chains has been achieved on a 250mm×20mm ID Chiralpak(®) IA column using the appropriate mixture of n-hexane/chlorofom/ethanol as eluent by successive injections of a solution of the sample in chloroform. Using this protocol up to 120mg of each enantiomer of the corresponding axially chiral amino acid derivative were obtained from 300mg of racemate. [(Sa)-2a, 105mg; (Ra)-2a, 60mg, [(Sa)-2b, 105m...Continue Reading

References

Jun 1, 1997·Journal of Pharmaceutical and Biomedical Analysis·M Turowski, R Kaliszan
Oct 1, 1996·Chemical Reviews·F. Javier Sardina, Henry Rapoport
Sep 21, 2005·Organic & Biomolecular Chemistry·Jasper KaiserFloris P J T Rutjes
Nov 21, 2008·Chemical Society Reviews·Yoshio Okamoto, Tomoyuki Ikai
Apr 7, 2009·Angewandte Chemie·Joanna ParadowskaJacek Mlynarski
Feb 7, 2012·Mini Reviews in Medicinal Chemistry·R SaladinoM Crucianelli
Jul 28, 2012·Journal of Chromatography. a·István IliszAntal Péter
Jul 10, 2013·Current Opinion in Structural Biology·William H ZhangColin J Jackson

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