title: Eremophilane sesquiterpenes from Cacalia ainsliaeflora.
abstract: Chemical investigation of Cacalia ainsliaeflora afforded four new eremophilane sesquiterpenes (1 - 3, 5) and a known sesquiterpene (4), which were identified as 3 beta-angeloyloxy-8 alpha-hydroxy-6 beta-methoxyeremophil-7(11),9(10)-dien-8,12-olide (1), 3 beta-angeloyloxy-6 beta,8 alpha-dihydroxyeremophil-7(11),9(10)-dien-8,12-olide (2), 3 beta-angeloyloxy-8 alpha-hydroxy-6 beta-ethoxyeremophil-7(11),9(10)-dien-8,12-olide (3), 3 beta-angeloyloxy-8-oxo-eremphila-6,9-dien-12-oic acid (4), and 3,8-oxo-eremophila-6,9-dien-12-oic acid (5) respectively. These compounds were assayed against Escherichia coli, Staphylococcus aureus and Bacillus subtilis, and compounds 1, 2, 4 and 5 showed weak antibacterial activity. The structures of the compounds were established by 1D and 2D NMR experiments.
authors.affiliation: Department of Chemistry, National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, People's Republic of China.
authors.forename: Manjun
authors.initials: M
authors.lastname: Mao
authors.forename: Zhongjian
authors.initials: Z
authors.lastname: Jia
mesh_terms: D019659:Asteraceae; D001412:Bacillus subtilis / Q000187:drug effects; D001419:Bacteria / Q000187:drug effects; D004926:Escherichia coli / Q000187:drug effects; D008516:Medicine, Chinese Traditional; D008826:Microbial Sensitivity Tests; D009281:Naphthalenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology; D018517:Plant Roots / Q000737:chemistry; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D009281:Naphthalenes; D010936:Plant Extracts; D000081223:Polycyclic Sesquiterpenes; D012717:Sesquiterpenes; C018286:eremophilane compounds