title: Oleanane triterpenes from Junellia tridens.
abstract: Three novel triterpenes, 3,4-seco-olean-12-ene-3,28-dioic acid (4), 3alpha-hydroxyolean-11-en-28,13beta-olide (5), and 3alpha-hydroxyoleane-11:13(18)-dien-28-oic acid (6), were isolated from the aerial parts of the Argentinean shrub, Junellia tridens. Another five compounds-oleanolic (1), oleanonic (2), and epioleanolic acids (3), all biosynthetically related to the three new oleananes, and epibetulinic acid (7) and sitosterol (8)-were also isolated. Structures were elucidated primarily by 1D and 2D NMR and mass spectrometry, and all protons and carbons of the three novel compounds were fully assigned by NMR. We report the minimum inhibitory concentrations of these compounds against Mycobacterium tuberculosis and conclude that they are responsible for antitubercular activity originally observed in the crude plant extract. LC-MS data is provided on the occurrence of triterpenes 1-6 in six other species of Junellia.
authors.affiliation: Department of Pharmaceutical Sciences and Department of Pharmacology and Toxicology, Division of Medicinal Chemistry, College of Pharmacy, The University of Arizona, Tucson, Arizona 85721, USA.
authors.forename: C G
authors.initials: CG
authors.lastname: Caldwell
authors.forename: S G
authors.initials: SG
authors.lastname: Franzblau
authors.forename: E
authors.initials: E
authors.lastname: Suarez
authors.forename: B N
authors.initials: BN
authors.lastname: Timmermann
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D019684:Magnoliopsida / Q000737:chemistry*; D013058:Mass Spectrometry; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D009169:Mycobacterium tuberculosis / Q000187:drug effects; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D014315:Triterpenes