title: Eremophilenolides and other constituents from the roots of Ligularia sagitta.
abstract: Chemical investigation of the roots of Ligularia sagitta has resulted in the characterization of six eremophilenolides 6beta,8beta-dimethoxy-10beta-hydroxyeremophil-7(11)-en-12,8alpha-olide (1), 6beta-angeloyloxy-10beta-hydroxy-8beta-methoxyeremophil-7(11)-en-12,8alpha-olide (2), 6beta-(2'-methylbutanoyloxy)-10beta-hydroxy-8beta-methoxyeremophil-7(11)-en-12,8alpha-olide (3), 6beta-angeloyloxy-10beta-hydroxy-8alpha-methoxyeremophil-7(11)-en-12,8beta-olide (4), 6beta-(2'-methylbutanoyloxy)-10beta-hydroxy-8alpha-methoxyeremophil-7(11)-en-12,8beta-olide (5) and 8beta,10beta-dihydroxy-6beta-methoxyeremophil-7(11)-en-12,8alpha-olide (6), together with one monoterpene (3 R,4 R,6 S)-3,6-dihydroxy-1-menthene (7), two triterpenes lupeol (8) and ursolic acid (9), and beta-sitosterol (10). The structures of five new constituents (1-5) were elucidated by spectroscopic methods including 2D-NMR experiments. The compounds 1, 5 and 7 showed antibacterial activity by being assayed against Staphylococcus aureus, Bacillus subtilis and Escherichia coli.
authors.affiliation: College of Chemistry and Chemical Engineering, National Laboratory of Applied Organic Chemistry, Lanzhou University, People's Republic of China.
authors.forename: Xu-Qin
authors.initials: XQ
authors.lastname: Li
authors.forename: Kun
authors.initials: K
authors.lastname: Gao
authors.forename: Zhong-Jian
authors.initials: ZJ
authors.lastname: Jia
mesh_terms: D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000494:pharmacology*; D019659:Asteraceae; D001412:Bacillus subtilis / Q000187:drug effects; D001419:Bacteria / Q000187:drug effects*; D004926:Escherichia coli / Q000187:drug effects; D006801:Humans; D008826:Microbial Sensitivity Tests; D009281:Naphthalenes / Q000008:administration & dosage / Q000494:pharmacology; D008517:Phytotherapy; D010936:Plant Extracts / Q000008:administration & dosage / Q000494:pharmacology*; D018517:Plant Roots; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D009281:Naphthalenes; D010936:Plant Extracts; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes; C018286:eremophilane compounds