Results 61 to 70 of about 129 (81)

Neuroprotective effects of naturally occurring biflavonoids

Bioorganic & Medicinal Chemistry Letters, 2005
We examined neuroprotective effects of naturally occurring biflavonoids on oxidative stress-induced and amyloid beta peptide-induced cell death in neuronal cells. Among the nine biflavonoids tested, amentoflavone, ginkgetin, and isoginkgetin exhibited strong neuroprotection against cytotoxic insults induced by oxidative stress and amyloid beta ...
Sam Sik, Kang, Ji Yeon, Lee, Yoo Keum, Choi, Sun Sook, Song, Ju Sun, Kim, Su Jin, Jeon, Yong Nam, Han, Kun Ho, Son, Byung Hee, Han   +8 more
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A new biflavonoid fromOchna Beddomei

Journal of Asian Natural Products Research, 2003
A new biflavonoid, 2,3-dihydroochnaflavone 7,4',7"-tri-O-methyl ether (1) together with two known biflavonoids namely, 2,3-dihydroochnaflavone (2) and ochnaflavone (3) were isolated from the stem bark of Ochna beddomei. The structures were determined by means of spectral and chemical studies.
Jayakrishna, G., Reddy, M.K., Jayaprakasam, B., Gunasekar, D., Blond, A., Bodo, B.   +5 more
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Biflavonoids and Proanthocyanidins

1989
The biflavonoids and proanthocyanidins constitute the two major classes of oligomeric flavonoids found in plants (126, 136). The biflavonoids are oxidative coupling products leading to biflavones, flavanone-flavones, and biflavanones. These compounds always carry carbonyl functions at the C-4 positions (126).
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Biflavonoids from Daphne odora

Phytochemistry, 1995
Abstract Two new biflavonoids, daphnodorins E and F, were isolated from the roots of Daphne odora and their structures established from spectral and chemical evidence.
Kimiye Baba, Michi Yoshikawa, Masahiko Taniguchi, Mitsugi Kozawa   +3 more
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Abiesin, a biflavonoid of abies webbiana

Phytochemistry, 1984
Abstract Abiesin, a new biflavonoid, has been isolated from the leaves of Abies webbiana and identified as 5,3″,7″- trihydroxy-7,4′,4‴-trimethoxy-(3′,6″)-biflavone.
A. Chatterjee, J. Kotoky, K.K. Das, J. Banerji, T. Chakraborty   +4 more
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Biflavonoid constituents of Campylospermum mannii

Biochemical Systematics and Ecology, 2009
Abstract Air dried leaves and stem bark of Campylospermum mannii used in the south of Cameroon by the Baka pigmies to remedy heart and stomach disorders have been examined for their photochemical content. Three biflavonoid, amentoflavone, robustaflavone and chamaejasmin were characterized alongside with two new biflavonoids, campylospermones A and ...
S.S. Elo Manga, A.E. Tih, R.T. Ghogomu, A. Blond, B. Bodo   +4 more
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Biflavonoids from Ochna lanceolata

Phytochemistry Letters, 2008
Abstract Two new biflavonoids, 7,4′,7″,4‴-tetramethylisochamaejasmin ( 1 ) and 2,3-dihydroochnaflavone 7″- O - methyl ether ( 2 ), together with six known flavonoids ( 3 – 8 ) were isolated from the stem bark of Ochna lanceolata . Their structures were established on the basis of spectral studies.
Bandi A.K. Reddy, Nimmanapalli P. Reddy, Duvvuru Gunasekar, Alain Blond, Bernard Bodo   +4 more
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Biflavonoids. Part 4. Structure and stereochemistry of novel flavanone- and the first isoflavanone-benzofuranone biflavonoids

Tetrahedron, 1999
Abstract The structure and stereochemistry of (2 R ,3 S )-naringenin-(3 α →5)-(2 R )-maesopsin, its isoflavanone analogue, (2 S ,3 R )-dihydrogenistein-(2 α →7)-(2 R )-maesopsin, and the 2S (F-ring) diastereomers of both compounds from the heartwood of Berchemia zeyheri were established by 1 H NMR and CD data.
Riaan Bekker, E.Vincent Brandt, Daneel Ferreira   +2 more
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A biflavonoid from Cycas beddomei

Phytochemistry, 1998
A new biflavanone, tetrahydrohinokiflavone, together with amentoflavone has been isolated from the leaves of Cycas beddomei. The structures were established on the basis of spectral and chemical evidence.
M. Sobha Rani, C. Venkata Rao, D. Gunasekar, A. Blond, B. Bodo   +4 more
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Aryllead triacetates as synthons for the synthesis of biflavonoids. Part 2. Synthesis of a Garcinia-type biflavonoid

Journal of the Chemical Society, Perkin Transactions 1, 1994
Arylation of 3-(phenylsulfonyl)chroman-4-one 1 with simple aryllead triacetates affords the corresponding 3-aryl-3-(phenylsulfonyl)chroman-4-one in 64–74% yield. However, no reaction took place with the hindered 2,4,6-trimethoxyphenyllead triacetate 9. Reaction of the 8-triacetoxyplumbylflavane derivative 10 with 4′-methoxy-3-(phenylsulfanyl)flavanone ...
Dervilla M. X. Donnelly, Brendan M. Fitzpatrick, Sarah M. Ryan, Jean-Pierre Finet   +3 more
openaire   +1 more source