Antisweet natural products. XI. Structures of sitakisosides VI-X from Stephanotis lutchuensis Koidz. var. japonica

Article abstract of DOI:10.1248/cpb.42.2455

From the fresh stem of Stephanotis lutchuensis var. japonica, five new oleanane-type triterpenoid glycosides named sitakisosides VI-X (1-5) were isolated. Their structures were determined on the basis of spectroscopic data and chemical evidence. Sitakisosides VI and VII are 3-O-β-D-xylopyranosyl(1 → 6)-β-D-glucopyranosyl(1 → 6)-β-D-glucopyranosido-21-O-(6-N-methylanthranilyl)-β-D-glucopyranos yl and 3-O-β-D-xylopyranosyl(1 → 6)-β-D-glucopyranosyl(1 → 6)-β-D-glucopyranosido-21-O-(4-N-methylanthranilyl)-β-D-glucopyranos yl sitakisogenin, respectively. Sitakisoside VIII is 3-O-β-D-xylopyranosyl(1 → 6)-β-D-glucopyranosyl(1 → 6)-β-D-glucopyranosido-21-O-N-methylanthranilyl-3β,16β,21β,28-tetr ahydroxyolean-12-ene-22-one. Sitakisoside IX is 3-O-β-D-xylopyranosyl(1 → 6)-β-D-glucopyranosyl(1 → 6)-β-D-glucopyranosido-21-O-(6-N-methylanthranilyl)-β-D-glucopyranos yl gymnestrogenin. Sitakisoside X is 3-O-β-D-xylopyranosyl(1 → 6)-β-D-glucopyranosyl(1 → 6)-β-D-glucopyranosyl longispinogenin.

Full text of DOI:10.1248/cpb.42.2455

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