title: Two new 11alpha,12alpha-epoxy-ursan-28,13beta-olides and other triterpenes from Cecropia catharinensis.
abstract: Three new triterpenes, 2alpha-acetoxy-3beta,19alpha-dihydroxy-11alpha,12alpha-epoxy-ursan-28,13beta-olide, 3beta-acetoxy-2alpha,19alpha-dihydroxy-11alpha,12alpha-epoxy-ursan-28,13beta-olide and 2-O-acetyl-euscaphic acid together eight known triterpenes were isolated from the roots and stems of Cecropia catharinensis. Their structures were determined by detailed analysis of NMR spectra and the relative configurations established by difference nOe experiments. In addition, four flavonoid glucosides (vitexin, isovitexin, orientin and isoorientin) were found in the leaves.
authors.affiliation: Departamento de Quimica, Universidade Federal de Santa Catarina, Florianopolis-SC, Brazil.
authors.forename: E C
authors.initials: EC
authors.lastname: Machado
authors.forename: R A
authors.initials: RA
authors.lastname: Yunes
authors.forename: A
authors.initials: A
authors.lastname: Malheiros
authors.forename: E C
authors.initials: EC
authors.lastname: Gomez
authors.forename: F
authors.initials: F
authors.lastname: Delle Monache
mesh_terms: D001938:Brazil; D035702:Cecropia Plant / Q000737:chemistry*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018515:Plant Leaves / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: C533514:2-O-acetyl-euscaphic acid; C533512:2-acetoxy-3beta,19-dihydroxy-11,12-epoxy-ursan-28,13beta-olide; C533513:3beta-acetoxy-2,19-dihydroxy-11,12-epoxy-ursan-28,13beta-olide; D014315:Triterpenes