A novel phenanthrenolide and C-benzyl dihydrochalcones from Uvaria puguensis |
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Authors: | Makangara John J Jonker Stephan A Nkunya Mayunga H H |
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Institution: | Department of Chemistry, University of Dar es Salaam, Tanzania. |
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Abstract: | Two new natural products, the phenanthrenoid puguenolide (6-hydroxy-3-methoxy-4-oxapyren-5-one) and isoangoletin were isolated from the stem bark of the newly described Uvaria species, U. puguensis D.M. Johnson, together with the sesquiterpene guaiol and the usual C-benzyldihydrochalcones previously found in the genus Uvaria, viz. uvaretin, diuvaretin, chamuvaritin and a mixture of triuvaretin and isotriuvaretin. Structural elucidation was achieved through a combination of spectroscopic methods. |
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