A New Triterpene Saponin from Heteropappus biennis with an Unusual Carbohydrate Chain |
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| Authors: | Gerd Bader Tuja Danzandarjaa Karl Hiller Gottfried Reznicek Johann Jurenitsch Monika Golly Harald Schrder Manfred Schubert-Zsilavecz Ernst Haslinger |
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| Institution: | Gerd Bader,Tuja Danzandarjaa,Karl Hiller,Gottfried Reznicek,Johann Jurenitsch,Monika Golly,Harald Schröder,Manfred Schubert-Zsilavecz,Ernst Haslinger |
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| Abstract: | A new saponin, O-α-D -arabinopyranosyl-(1→6)-O-α-L -rhamnopyranosyl-(1→2)]-O-β-D -xylopyranosyl-(1→3)]-β-D -glucopyranosyl arjunolate ( 1 ) was isolated from the flowers of Heteropappus biennis (LDB .) TAMAMSCH . The structure was established mainly by a combination of 1D selective and 2D NMR techniques like COSY, TOCSY, ROESY, HMQC, and HMBC. Molecular-modelling calculations showed that the oligosaccharide chain is rather rigid. Six minimum structures are discussed. |
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