Terpenes from Otostegia integrifolia |
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Authors: | Tesso Hailemichael König Wilfried A |
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Institution: | Institut für Organische Chemie, Universit?t Hamburg, Martin-Luther-King-Platz-6, D-20146 Hamburg, Germany. |
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Abstract: | 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. |
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Keywords: | Otostegia integrifolia Benth Lamiaceae Essential oil Furanolabdane diterpenes Otostegindiol Preotostegindiol (+)-Axinyssene Pentatriacontane Stigmasterol |
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