SAPONINS IN CYCLAMEN SPECIES: CONFIGURATION OF CYCLAMIRETIN C AND STRUCTURE OF ISOCYCLAMIN
Five sapogenins and three saponins were identified in bulbs of 14 cytologically defined Cyclamen species and their structures were determined by means of mass, 1H and 13C NMR spectroscopy.In addition to the known products of hydrolysis, primulagenin A was found, and cyclamiretin C was shown to be identical with cyclamigenin C.The new saponin isocyclamin was identified as 3β--O-β-D-glucopyranosyl-(1-4)--α-L-arabinopyranosyl>-16α-hydroxy-13β,28-epoxy-olean-30-al. - Key Word Index - Cyclamen; Primulaceae; saponin; sapogenin; chemotaxonomy.
Reznicek, Gottfried,Jurenitsch, Johann,Robien, Wolfgang,Kubelka, Wolfgang
p. 825 - 828
(2007/10/02)
SAPONINS FROM PRIMULA DENTICULATA
A new triterpenoid saponin, primulanin, isolated from the whole plant of Primula denticulata was characterized as 3-O2)-β-D-glucopyranosyl-(1->4)-α-L-arabinopyranosyloxy>-16α-hydroxy-13β,28-epoxy-olean-30-al.Key Word Index - Primula denticulata; Primulaceae; triterpenoid saponins; primulanin; saxifragifolin B.
Structure Elucidation of Two Triterpenoid Tetrasaccharides from Androsace saxifragifolia
Saxifragifolins A and B, two new triterpenoid tetrasaccharides isolated from the aerial part of Androsace saxifragifolia, were respectively shown to be androsacenol-3-O-2)-β-D-glucopyranosyl-(1-->4)-(β-D-glucopyranosyl-(1-->2))-α-L-arabinopyranoside> (1) and cyclamiretin A 3-O-2)-β-D-glucopyranosyl-(1-->4)-(β-D-glucopyranosyl-(1-->2))-α-L-arabinopyranoside> (2).The structural details were elucidated by a combination of fast atom-bombardment mass spectrometry, chemical degradation, and one- and two-dimensional n.m.r. spectroscopy.
Waltho, Jonathan P.,Williams, Dudley H.,Mahato, Shashi B.,Pal, Bikas C.,Barna, Jennifer C. J.
p. 1527 - 1532
(2007/10/02)
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