Chemical constituents from plant of Stelleropsis tianschanica / 中草药

Objective: To study the chemical constituents from the arerial parts of Stelleropsis tianschanica. Methods: The constituents were isolated and purified by silica gel chromatography repeatedly, and the structures were identified by spectra analysis and chemical methods. Results: Thirteen compounds were isolated from S. tianschanica and the structures were identified as (+)-pinoresinol (1), (-)-pinoresinol (2), 3'-desmethylarctigenin (3), arctigenin (4), pluviatolide (5), umbelliferone (6), 4-(3,4- dimethoxybenzyl)-3-(4-hydroxy-3-methoxybenzyl)-tetrahydrofuran-2-ol (7), daphnogitin (8), daphnetone (9), blumenol B (10), loliolide (11), 4'-hydroxyacetophenone (12), and 4'-hydroxybenzoic acid (13). Conclusion: Compounds 1-13 were all obtained for the first time from the plant of S. tianschanica and the genus Stelleropsis Pobed.

Chemical constituents from flowers of Rhaponticum uniflorum / 中草药

Objective: To investigate the chemical constituents from the flowers of Rhaponticum uniflorum. Methods: The chemical constituents were separated and purified by macroporous resin, silica gel, Sephadex LH-20, and MCI column chromatographies. Their structures were determined by physicochemical properties and spectral data. Results: Seventeen compounds were isolated from the ethanol extract in the flowers of R. uniflorum. Among them, eleven flavones were identified as 5,7,4'-trihydroxy-3'-methoxyflavone (1), quercetin-3'-O-methyl ether (2), apigenin (3), kaempferol (4), luteolin (5), quercetin (6), apigenin-7-O-β-D-glycuronate ethyl ester (7), kaempferol-3-O-α-L-rhamnoside (8), quercetin-3-O-α-L-rhamnoside (9), apigenin-7-O-β-D-glucopyranoside (10), and apigenin-6,8-di-C-β-D-glucoside (11); Two liganans were hemislin B glucoside (12) and hemislin B (13); Two phytoecdysones were ecdysterone (14) and turkesterone (15); Others were ursolic acid (16) and 3,5-O-dicaffeoyl quinic acid (17). Conclusion: Compounds 1, 2, 7-10, 12 and 13 are isolated from the plants of Rhaponticum Cass. for the first time, and the compounds 1, 2, and 7-17 are found from the flowers of R. uniflorum for the first time.