title: Sesquiterpenes from Warburgia ugandensis and their antimycobacterial activity.
abstract: The dichloromethane extract of the stem bark of Warburgia ugandensis afforded three new coloratane sesquiterpenes, namely: 6alpha,9alpha-dihydroxy-4(13),7-coloratadien-11,12-dial (1), 4(13),7-coloratadien-12,11-olide (2), and 7beta-hydroxy-4(13),8-coloratadien-11,12-olide (3), together with nine known sesquiterpenes, i.e., cinnamolide-3beta-acetate (4), muzigadial (5), muzigadiolide (6), 11alpha-hydroxymuzigadiolide (7), cinnamolide (8), 7alpha-hydroxy-8-drimen-11,12-olide (9), ugandensolide (10), mukaadial (11), ugandensidial (12), and linoleic acid (13). Their structures were assigned on the basis of 1D and 2D-NMR spectroscopic and GC-MS analysis. The compounds were examined for their antimycobacterial activity against Mycobacterium aurum, M. fortuitum, M. phlei and M. smegmatis; and the active constituents showed MIC values ranged from 4 to 128 microg/ml compared to the antibiotic drugs ethambutol (MIC ranged from 0.5 to 8 microg/ml) and isoniazid (MIC ranged from 1 to 4 microg/ml).
authors.affiliation: Department of Pharmacognosy, Institute of Pharmaceutical Sciences, Karl-Franzens University Graz, Universitaetsplatz 4/1, A-8010 Graz, Austria.
authors.forename: Abraham Abebe
authors.initials: AA
authors.lastname: Wube
authors.forename: Franz
authors.initials: F
authors.lastname: Bucar
authors.forename: Simon
authors.initials: S
authors.lastname: Gibbons
authors.forename: Kaleab
authors.initials: K
authors.lastname: Asres
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D008401:Gas Chromatography-Mass Spectrometry; D009682:Magnetic Resonance Spectroscopy; D019684:Magnoliopsida / Q000737:chemistry*; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D009161:Mycobacterium / Q000187:drug effects*; D012717:Sesquiterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D012717:Sesquiterpenes