New lignans from leaves of Macropiper excelsum |
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| Authors: | Graeme B. Russell Peter G. Fenemore |
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| Affiliation: | Applied Biochemistry Division, D.S.I.R., Palmerston North, New Zealand;Entomology Division, D.S.I.R., Nelson, New Zealand |
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| Abstract: | Four new lignans, (+)-diayangambin; (+)-excelsin; (+)-epiexcelsin and (+)-demethoxyexcelsin, were isolated from leaves of Macropiper excelsum and their structures and configurations have been determined by spectroscopic studies. Diayangambin is only the second naturally occurring diaxially substituted 3,7-dioxabicyclo-[3,3,0]-octane to have been isolated. |
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| Keywords: | Piperaceae lignans (+)-diayangambin (+)-excelsin (+)-epiexcelsin (+)-demethoxyexcelsin. |
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