Navegando por Autor "CONSERVA, Lucia Maria"

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Two Dibenzylbutyrolactol derivatives and other chemical constituents from Aristolochia peltato-deltoidea
(1999-04) SILVA, Ana Paula Freitas da; PALMEIRA JUNIOR, Sebastião Ferreira; CONSERVA, Lucia Maria; GUILHON, Giselle Maria Skelding Pinheiro
The hexane extract from the aerial parts of Aristolochia peltato-deltoidea Hoehne (Aristolochiaceae) afforded two new epimeric lignans of the type dibenzylbutyrolactol, rel-(8R, 8 S, 9S)-3,4-dimethoxy-3 ,4 -methylenedioxy-9b-ethoxy- and rel-(8R, 8 S, 9R)-3,4-dimethoxy-3 ,4 -methylenedioxy-9a-ethoxy-lignans-8.8 ,9.O.9 , besides a benzofuran neolignan, known as eupomatenoid-7, a-tocopherylquinone, b-sitosterol and stigmasterol. From the chloroform extract were isolated two diastereomeric dibenzylbutyrolactone lignans: rel-(8R, 8 R)- and rel-(8R, 8 S)-3,4-dimethoxy-3 ,4 -methylenedioxy-9-oxo-lignans-8.8 ,9.O.9 . Chemical composition analysis by GC/MS of the non polar fractions from the hexane extract was also carried out and ten components were identified. The structures of the isolated compounds were elucidated utilizing spectrometric methods.