title: Ursane and tirucallane-type triterpenes of Boswellia rivae oleo-gum resin.
abstract: Two new ursane-type triterpenes characterized as 3-oxo-24-acetoxy-11α-hydroxy-urs-12-ene (1) and methyl 3α-acetoxy-11α-methoxy-urs-12-en-24-oate (2), together with known compounds 3-11, were isolated from Boswellia rivae oleo-gum resin exudate. Their structural elucidation was accomplished using physical, chemical, and spectroscopic methods. The compounds exhibited weak to moderate antibacterial activities against some Gram-positive and Gram-negative bacteria.
authors.affiliation: a Chemistry Department , Maseno University , Maseno , Kenya.
authors.forename: Lawrence Onyango Arot
authors.initials: LO
authors.lastname: Manguro
authors.affiliation: b Botany Department , Rongo University College , Rongo , Kenya.
authors.forename: Samuel Otieno
authors.initials: SO
authors.lastname: Wagai
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D029743:Boswellia / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D007630:Kenya; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D012116:Resins, Plant / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry*; D053978:Pentacyclic Triterpenes
chemical_list: D000900:Anti-Bacterial Agents; D012116:Resins, Plant; D014315:Triterpenes; C000613854:3-oxo-24-acetoxy-11alpha-hydroxy-urs-12-ene; C000613855:methyl 3alpha-acetoxy-11alpha-methoxy-urs-12-en-24-oate; C514393:tirucallane; C000606873:ursane; D053978:Pentacyclic Triterpenes
keywords: Boswellia rivae; Burseraceae; antibacterial activities; terpenoids