BI- and tricyclic diterpenoids from Halimium viscosum |
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Authors: | Rodilla J M De Mendonça D I Ismael M I Figueiredo J A Silva M L Lopes E |
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Institution: | Departmento de Química, Universidade da Beira Interior, Covilh?, Portugal. |
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Abstract: | The study of the acid and neutral parts of the n-hexane extract of Halimium viscosum (S. Jo?o da Pesqueira, Portugal) has led to the isolation of various known diterpenoids with the ent-halimane skeleton. Five new compounds have now been isolated, one with the ent-halimane skeleton, and four with the valparane skeleton, two of them with the valparane skeleton degraded. The structures of these compounds, determined by spectroscopic methods using 2D experiments (1H-13C, HMQC and HMBC), were dimethyl 1(10)-halimen-15,18-dioate, dimethyl 3,19-dinor-15-valparen-2,4-dioate, methyl 16-nor-2,3-secovalpara-3,15-dioxo-2-oate, 1,3,5,1 5-valparatetraene and 3R-4alpha-methoxy-15-valparen-2-one. |
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