Comparative study on separation of diastereomers by HPLC |
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Authors: | J. Fekete M. Milen L. Hazai L. Poppe Cs. Szántay A. Kettrup I. Gebefügi |
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Affiliation: | 1. Institute of General and Analytical Chemistry, University of Technology and Economics, 1521, Budapest, Hungary 2. Department of Organic Chemistry, University of Technology and Economics, 1521, Budapest, Hungary 3. Research Group for Alkaloid Chemistry of the Hungarian Academy of Sciences, 1521, Budapest, Hungary 4. National Research Centrum, Institute of Ecological Chemistry, GSF, Ingolst?dter Landstrasse 1, 85764, Neuherberg, Germany
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Abstract: | Summary Reversed (RP-HPLC) and normal phase chromatographic (NP-HPLC) separations have been developed for diastereomers ofN-acyl-1-methyl-1,2,3,4-tetrahydo-β-carbolines which are acylated derivatives of simple natural β-carboline alkaloids. Separations of derivatives having different acyl moieties in theO,O-diacyl-tartaric acid ester subtituent differed remarkably. Little or no resolution in either NP-HPLC or RP-HPLC could be achieved with the diacetyl-tartrate derivative. Base-line separation by RP-HPLC but no separation by NP-HPLC was possible with the bulkier and more apolar dipivaloyl derivative. Retention order of the bis-benzoylated diastereomers was reversed and separation time increased dramatically by RP-HPLC. Good separation of the medium polarity, but rigid,N-camphanyl derivative by NP-HPLC has been achieved, whereas RP-HPLC could not be used for separation of these diastereomers. Separability of different diastereomers was highly dependent on polarity and rigidity of the derivatizingN-acyl moieties. Conformational analysis by molecular mechanics and comparison of the lowest energy conformational states of the diastereomers was applied to rationalise separation-retention behaviour of stereoisomers by RP-HPLC. Presented at Balaton Symposium '01 on High-Performance Separation Methods, Siófok, Hungary, September 2–4, 2001 |
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Keywords: | Column liquid chromatography Asymmetric induction β -Carbolines Diastereomeric derivatives Conformational analysis |
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