Isoflavonoids and triterpenoids isolated from Pterodon polygalaeflorus

Autor: Raimundo Braz-Filho, Mário Geraldo de Carvalho, Luiz Augusto da C. Meleira, Maria Iracema L. Machado, Délcio D. Marques
Jazyk: angličtina
Rok vydání: 1998
Předmět:
Zdroj: Journal of the Brazilian Chemical Society, Vol 9, Iss 3, Pp 295-301 (1998)
ResearcherID
Journal of the Brazilian Chemical Society v.9 n.3 1998
Journal of the Brazilian Chemical Society
Sociedade Brasileira de Química (SBQ)
instacron:SBQ
Journal of the Brazilian Chemical Society, Volume: 9, Issue: 3, Pages: 295-301, Published: MAY 1998
ISSN: 0103-5053
Popis: The isoflavonoids 6,7-dimethoxy-3’,4’-methylenodioxy-, 4’-hydroxy-3’,6,7-trimethoxy-, 3,4,6,7-tetramethoxy-, 7-hydroxy-6-methoxy-3,4-methylenodioxy-, 2’,6,7-trimethoxy-3’,4’-methylenedioxy-, 2’,3’,4’,6,7-pentamethoxy- and 2’,4’,5,6,7-pentamethoxyisoflavone, together with the triterpenoids lupeol and betulin and 4-methoxybenzoic acid, were isolated from acetone extracts of the sapwood and heartwood of Pterodon polygalaeflorus. The structures of these natural products have been characterized by spectrometric methods, mainly extensive 1D and 2D NMR experiments, which were also used for complete assignments of the chemical shifts of the hydrogen and carbon-13 atoms of isoflavonoids. Os isoflavonóides 6,7-dimetoxi-3’,4’-metilenodioxi-, 4’-hidroxi-3’,6,7-trimetoxi-, 3,4,6,7-tetrametoxi-, 7-hidroxi-6-metoxi-3,4-metilenodioxi-, 2’,6,7-trimetoxi-3’,4’-metilenodioxi-, 2’,3’,4’,7,7-pentametoxi- e 2’,4’,5,6,7-pentametoxiisoflavona, os triterpenóides lupeol e betulina e o ácido 4-metoxibenzóico foram isolados dos extratos acetônicos do alburno e do cerne de Pterodon polygalaeflorus. As estruturas destes produtos naturais foram caracterizadas por métodos espectrométricos, principalmente experiências de RMN 1D e 2D de hidrogênio e carbono-13, que foram também utilizados para a atribuição inequívoca dos deslocamentos químicos dos átomos de hidrogênio e carbono-13 dos isoflavonóides.
Databáze: OpenAIRE
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