Dihydroflavonols from Lannea coromandelica
Dihydroflavonols from Lannea coromandelica
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DOI：
10.1016/s0031-9422(00)00048-0
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发表时间：
2000-08-01
期刊：
影响因子：
3.8
通讯作者：
Tahara, S
中科院分区：
文献类型：
--
作者：
Islam, MT;Tahara, S
从山榄（Lannea coromandelica）茎皮中分离得到两个黄酮醇类化合物：（2 R，3S）-（+）-3 '，5-二羟基-4'，7-二甲氧基二氢黄酮醇和（2 R，3R）-（+）-4 '，5，7-三甲氧基二氢黄酮醇。与已知的（2 R，3R）-（+）-4 ′，7-二-O-甲基二氢槲皮素、（2 R，3R）-（+）-4 ′，7-二-O-甲基二氢山奈酚和（2 R，3R）-（+）-4 ′-O-甲基二氢槲皮素一起沿着。其中（2 R，3S）-（+）-3 '，5-二羟基-4'，7-二甲氧基二氢黄酮醇为罕见的顺式异构体。所有化合物的结构均经2D NMR和CD分析确证。(C)2000爱思唯尔科技有限公司版权所有。
The dihydroflavonols, (2R,3S)-(+)-3',5-dihydroxy-4',7-dimethoxydihydroflavonol and (2R,3R)-(+)-4',5,7-trimethoxydihydroflavonol were isolated from the stem bark of Lannea coromandelica. along with the known (2R,3R)-(+)-4',7-di-O-methyldihydroquercetin, (2R,3R)-(+)-4',7-di-O-methyldihydrokaempferol and (2R,3R)-(+)-4'-O-methyldihydroquercetin. All five compounds were isolated for the first time from the genus Lannea; furthermore, (2R,3S)-(+)-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. (C) 2000 Elsevier Science Ltd. All rights reserved.