Terpenes from Otostegia integrifolia.
The essential oil and chloroform extract of air-dried leaves of Otostegia integrifolia Benth. were investigated for the first time using analytical and preparative gas chromatography (GC), GC-mass spectrometry (MS) and NMR techniques. A total of 40 constituents including monoterpenes, sesquiterpenes, diterpenes and their derivatives were identified. A prenylbisabolane type diterpene, 1-methyl-4-(5,9-dimethyl-1-methylene-deca-4,8-dienyl)cyclohexene was identified as a major component. The chloroform extract of the leaves yielded two labdane type diterpenoids, 15,16-epoxy-3alpha,9alpha-dihydroxy-labda-13(16),14-diene and 9(13),15(16)-diepoxy-3alpha-hydroxy-16-dihydrolabda-14-ene, a saturated hydrocarbon, pentatriacontane, and stigmasterol. The structures of the isolated compounds were established by spectroscopic methods.
Institut für Organische Chemie, Universität Hamburg, Martin-Luther-King-Platz-6, D-20146 Hamburg, Germany.
Hailemichael
H
Tesso
Wilfried A
WA
König
D002849:Chromatography, Gas; D019686:Lamiaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D015394:Molecular Structure; D009822:Oils, Volatile / Q000032:analysis / Q000737:chemistry; D018515:Plant Leaves / Q000737:chemistry; D013729:Terpenes / Q000737:chemistry / Q000302:isolation & purification*
D009822:Oils, Volatile; D013729:Terpenes