A new bisabolene from Stevia tomentosa |
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Authors: | Valdez-Calderón Alejandro Torres-Valenci J Martín Manríquez-Torres J Jesús Velázquez-Jiménez René Gómez-Hurtado Mario A Román-Marín Luisa U Hernández-Hernández Juan D Cerda-García-Rojas Carlos M Joseph-Nathan Pedro |
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Affiliation: | Area Académica de Química, Universidad Autónoma del Estado de Hidalgo, Km 4.5 Carretera Pachuca-Tulancingo, Mineral de la Reforma, Hidalgo, 42184 Mexico. |
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Abstract: | The new sesquiterpene (1R,2R,3R,6R,7S)-1-acetoxy-2,3-dihydroxy-2,3-dihydrobisabolene (3) together with ten known terpenes and three known flavonoids were isolated from the aerial parts and from the roots of Stevia tomentosa. The structure of 3 follows from spectral studies, the relative chirality at C-3 follows from 1H NMR coupling constants comparison with the corresponding calculated values obtained by applying a generalized Karplus-type relationship to the dihedral angles of model compounds, and the absolute configuration is assumed in analogy to known (2R,3R,6R,7S)-2,3-epoxy-2,3-dihydrobisabolen-1-one (2). |
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