Dihydroflavonols from Lannea coromandelica
The dihydroflavonols, (2 R,3 S)-(+)-3′,5-dihydroxy-4′,7-dimethoxydihydroflavonol and (2 R,3 R)-(+)-4′,5,7-trimethoxydihydroflavonol were isolated from the stem bark of Lannea coromandelica, along with the known (2 R,3 R)-(+)-4′,7-di- O-methyldihydroquercetin, (2 R,3 R)-(+)-4′,7-di- O-methyldihydroka...
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Published in | Phytochemistry (Oxford) Vol. 54; no. 8; pp. 901 - 907 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
OXFORD
Elsevier Ltd
01.08.2000
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | The dihydroflavonols, (2
R,3
S)-(+)-3′,5-dihydroxy-4′,7-dimethoxydihydroflavonol and (2
R,3
R)-(+)-4′,5,7-trimethoxydihydroflavonol were isolated from the stem bark of
Lannea coromandelica, along with the known (2
R,3
R)-(+)-4′,7-di-
O-methyldihydroquercetin, (2
R,3
R)-(+)-4′,7-di-
O-methyldihydrokaempferol and (2
R,3
R)-(+)-4′-
O-methyldihydroquercetin. All five compounds were isolated for the first time from the genus
Lannea; furthermore, (2
R,3
S)-(+)-3′,5-dihydroxy-4′,7-dimethoxydihydroflavonol, was a rare
cis-type isomer. The structures of all compounds were elucidated by spectroscopic methods including 2D NMR and CD analysis. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0031-9422 1873-3700 |
DOI: | 10.1016/S0031-9422(00)00048-0 |