Luddin type anthraquinone glycosides from Putoria calabrica

Two new lucidin type anthraquinone glycosides, putorinoside A (1) and putorinoside B (2) were isolated from Putoria calabrica, in addition to two known anthraquinone glycosides, lucidin 3-O-β-glucopyranoside (3) and lucidin 3-O-primeveroside (4). Based on spectroscopic data, putorinosides A and B were identified as 2-hydroxymethyl-1-methoxy-3,5,6-trihydroxyanthraquinone 3-O-β-glucopyranoside and 2-hydroxymethyl-1-methoxy-3,6-dihydroxyanthraquinone 3-O-β-glucopyranoside, respectively

Cycloartane Triterpene Glycosides from the Roots of Astragalus brachypterus and Astragalus microcephalus

Abstract: Three new cycloartane-type triterpene glycosides, brachyosides A (1), B (3), and C (2), from the roots of Astragalus brachypterus and one new glycoside, cyclocephaloside II (4), from the roots of Astragalus microcephalus have been isolated together with five known saponins, astragalosides I, II, and IV, cyclocanthoside E, and cycloastragenol. The structures of the new compounds were established as 3-O-[β-d-xylopyranosyl(1→3)-β-d-xylopyranosyl-6-O-β-d-glucopyranosyl-3β,6α,16β,24(S),25-pentahydroxycycloartane (1), 3-O-β-d-xylopyranosyl-6-O-β-d-glucopyranosyl-24-O-β-d-glucopyranosyl-3β,6α,16β,24(S),25-pentahydroxycycloartane (2), 20(R),24(S)-epoxy-6-O-β-d-glucopyranosyl-3β,6α,16β,25-tetrahydroxycycloartane (3), and 20(R),24(S)-epoxy-3-O-(4‘-O-acetyl)-β-d-xylopyranosyl-6-O-β-d-glucopyranosyl-3β,6α,16β,25-tetrahydroxycycloartane (4). For the structure elucidations, 1D- and 2D-NMR experiments and FABMS were used

Secondary Metabolites from the Roots of Astragalus trojanus

Abstract: Six novel cycloartane-type glycosides were isolated from the roots of Astragalus trojanus. Two of these, compounds 1 and 2, have (20R,24S)-epoxy-3β,6α,16β,25-tetrahydroxycycloartane as the aglycon, while compounds 3−6 possess 3β,6α,16β,(24S),25-pentahydroxycycloartane as the aglycon. The saccharide moieties linked to the C-3, C-6, and C-24 or C-25 positions of the aglycons in 1−6 contained either xylopyranose, glucopyranose, rhamnopyranose, or arabinopyranose units. Structure elucidation of compounds 1−6 was accomplished through the extensive use of 1D and 2D NMR techniques. In addition, a new oleanene glycoside (7) and a new tryptophan derivative (8) were also isolated and characterized