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Novel Triterpene Saponins from Zizyphus joazeiro

✍ Scribed by Wolfgang Schühly; Jörg Heilmann; Ihsan Çalis; Otto Sticher

Publisher
John Wiley and Sons
Year
2000
Tongue
German
Weight
128 KB
Volume
83
Category
Article
ISSN
0018-019X

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✦ Synopsis

Two dammarane-type saponins with a novel aglycone derived from the parent 16,22-epoxy-24methylidenedammarane and lotoside A, a new lotogenin derivative, were isolated from the MeOH extract of the stem bark of the Brazilian medicinal plant Zizyphus joazeiro, in addition to the known saponin 3b-{{O-

The structures of the new compounds were determined as 16,22-epoxy-3b-[(b-d-glucopyranosyl) 4) by means of 1D-and 2D-NMR spectroscopy, as well as FAB mass spectrometry. For the novel aglycone, we propose the name joazeirogenin and, for the new saponins, joazeiroside A (2) and B (3). Joazeirogenin was found to be 16,22-epoxy-24-methylidenedammarane-3b,15a,16a,20b-tetrol. a ) Arap Arabinopyranose, Araf arabinofuranose, Glcp glucopyranose, Apif apiofuranose. b ) Coupling constants not assignable due to overlapping signals.

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