info:eu-repo/semantics/article
Neolignanas from an Embuia of Rio Grande do Sul, Brazil
Neolignanas de uma Embuia do Rio Grande do Sul, Brasil
Registro en:
10.5902/2179460X25486
Autor
Frick Neto, Francisco
Pagliosa, Frida Maciel
Vinadé, Maria Elizabeth do Canto
Institución
Resumen
The n-hexane of the bark of Ocotea porosa fractioned by chromatographic tecniques, afforded there neolignanas of benzofuranoid, type: porosin, (2R,3a,3aR,5R)-3a-allyl-3-methyl-5-methoxy- 2- (3' ,4', dimethoxyphenyl )-6-oxo-2 ,3 ,3a ,4,5,6 hexahydrobenzofuran; II, rel (2R,3S,3aR,5R,6S,7 a S)-3a-allyl-6-7a-dihydroxi-3-methyl-5-methoxy-2- (3' ,4', dimethoxyphenyl )-2-3-3a ,4,5,6,7 ,7a-octahidrobenzofuran, and Il, reI (2R,3S,3aR,5R,6R,7 a S)-3a-allyl-6,7a-dihidroxy-3.;methyl-5-methoxy-2-(3' ,4', dimethoxyphenyl )-2,3,3a,5,6,7,7a-octahydrobenzofuran. The structures of isolated neolignanas were identified using IR, 1H spectral analysis and by comparison with published data of similar compounds. O extrato hexânico do tronco de Ocotea porosa, fracionado por técnicas cromatográficas, forneceu três neolignanas do tipo benzofurânico, (2R, 3S, 3aR, 5R) -3a-alil-3 metil-5 metoxi-2(3’,4’, dimetoxifenil) -6-oxo-2,3,3a,4,5,6-hexahidrobenzofurano; II rel (2R, 3S, 3a, 3aR, 5R, 5R, 6S, 7 a S) -3a, alil-6, 7a, dihidroxi-3-metil-5 metoxi 2-(3’, 4’- dimetoxifenil)- 2-3-3a, 4,5,6,7,7a- octahidrobenzofurano e III, rel (2R, 3S, 3aR, 5R, 6S, 7 a S) – 3a-alil-6, 7a-dihidroxi-3 metil-5 metoxi-2-(3’,4’-dimetoxifenil)-2,3,3a,4,5,6,7,7a-octahidrobenzofurano. As estruturas das neolignanas isoladas foram identificadas por análise espectral no IR e de RMN de 1H e por comparação com dados espectrais de compostos idênticos.