A new echinocystic acid saponin, asteryunnanoside H (1), has been isolated from the roots of Astsr yunnanensis (Compositae). The structure and the unambiguous assignments of the 1H- and 13C NMR data of 1 were obtained...A new echinocystic acid saponin, asteryunnanoside H (1), has been isolated from the roots of Astsr yunnanensis (Compositae). The structure and the unambiguous assignments of the 1H- and 13C NMR data of 1 were obtained based on extensive use of 1D and 2D NMR techniques (COSY. TOCSY, ROESY, HMQC and HMBC), and chemical transformations.展开更多
Two new triterpenoid saponins named asterbatanoside D and E have been isolated from Aster batgngensis and their structures elucidated as 3-O-β-D-glucopyranosyl-bayogenin-28-O- β-D-glucopyranosyl-(1→6)-β-D-glucopyr...Two new triterpenoid saponins named asterbatanoside D and E have been isolated from Aster batgngensis and their structures elucidated as 3-O-β-D-glucopyranosyl-bayogenin-28-O- β-D-glucopyranosyl-(1→6)-β-D-glucopyranoside and 3-O-6'-acetyl-β-D-glucopyranosyl-bayogenin-28-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosyl. based on MS, 1D and 2D NMR techniques (COSY,TOCSY,ROESY, HMQC and HMBC), and Chemical reactions.展开更多
文摘A new echinocystic acid saponin, asteryunnanoside H (1), has been isolated from the roots of Astsr yunnanensis (Compositae). The structure and the unambiguous assignments of the 1H- and 13C NMR data of 1 were obtained based on extensive use of 1D and 2D NMR techniques (COSY. TOCSY, ROESY, HMQC and HMBC), and chemical transformations.
文摘Two new triterpenoid saponins named asterbatanoside D and E have been isolated from Aster batgngensis and their structures elucidated as 3-O-β-D-glucopyranosyl-bayogenin-28-O- β-D-glucopyranosyl-(1→6)-β-D-glucopyranoside and 3-O-6'-acetyl-β-D-glucopyranosyl-bayogenin-28-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosyl. based on MS, 1D and 2D NMR techniques (COSY,TOCSY,ROESY, HMQC and HMBC), and Chemical reactions.
