Isoflavonoids and a cinnamyl phenol from root extracts of Erythrina variegata

Estudo preliminar da atividade antibacteriana das cascas de Erythrina velutina Willd., Fabaceae (Leguminosae)

“…Além disto, este gênero tem provado ser uma fonte farta de espécies contendo agentes antimicrobianos que pertencem a várias classes estruturais de fl avonóides, como por exemplo, a E. variegata cuja atividade do extrato bruto das raízes foi demonstrada para Staphyloccus aureus e Mycobacterium smegmatis (Telikepalli et al, 1990).…”

Studies on the constituents of bulbs of the orchid Prosthechea michuacana and antioxidant activity

“…The two methylene groups at G 2.86 are typical of the ethane bridge in bibenzylic compounds [12]. According to the 1 H and 13 C data, a bibenzyl skeleton with one hydroxyl, one acetyl, one prenyl, and three O-methyl groups was deduced [13]. The signal at G C 112.4 is assigned to the nonprotonated carbon atom C-4c, based on correlations to the two-proton singlet at G H 6.43 (H-2c, H-6c) as well as due to the correlation of C-4c to the two-proton doublet at G H 3.31 (H-7c); C-4c was identified as the site of attachment of the prenyl group.…”

Erythrina variegata

“…The following compounds were isolated from the roots: warangalone (scandenone), 5,7,4′-trihydroxy-6,8-diprenylisofl avone, erycristagallin, erythrabys-sin-II, phaseollin, phaseollidin, isobavachin and a cinnamylphenol, eryvariestyrene ( E -1-[2, 4-dihydroxy-5-(3-m e t h y l bu t -2 -e ny l ) ] -2 -p h e ny l e t h y l e n e ) (Telikepalli et al 1990 ); pterocarpans, dihydrofolinin and erythrabyssin II, and the alkyl ester of ferulic acid, octacosyl ferulate (Ahmad et al 2002 ); orientanol B (9-hydroxy3-methoxy-2γ, (Sato et al 2002 ); two diphenylpropan-1,2-diols, eryvarinols A (1) and B (2) and their structures were elucidated as 1-(4-hydroxy-2-methoxyphenyl)-2-(4-hydroxy-3, 5-dimethoxybenzoyloxy)-3-(4-hydroxyphenyl) propan-1-ol (1) and its 3″-prenyl derivative (2) (Tanaka et al 2002a ); 3,9-dihydroxy-2,10-di(γ,γ-dimethylallyl)-6α,11α-dehydropterocarpan (erycristagallin) and 9-hydroxy-3-methoxy-2-γ,γ-dimethylallylpterocarpan (orientanol B) (Tanaka et al 2002b ); two 3-phenoxychromones, eryvarins F and G, and their structures were elucidated as 3-(2,4-dihydroxyphenoxy)-7-hydroxy-6,8-di (3,3-dimethylallyl)chromen-4-one and 3-(2,4-dihydroxyphenoxy)-8-(3,3-dimethylallyl)-2, 2-dimethylpyrano [5,6:6,7] chromen-4-one, respectively (Tanaka et al 2003 ); three isofl avonoids, eryvarins M-O, two 2-arylbenzofurans, eryvarins P and Q, and a 3-aryl-2,3-dihydrobenzofuran, eryvarin R ; two isofl avonoids, eryvarins S and T, and a new 2-arylbenzofuran, eryvarin U (Tanaka et al 2005 ); a biisofl avonoid, biseryvarin A, was isolated from the roots (Tanaka et al 2010 ); and two isofl avonoids, eryvarins V and W, and a chromen-4-one derivative, eryvarin X (Tanaka et al 2011 ).…”