Antimicrobial Isopropenyl-dihydrofuranoisoflavones from Crotalaria lachnophora

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• 作者：Maurice Ducret Awouafack ; Peter Spiteller ; Marc Lamsho虉ft ; Souvik Kusari ; Bojidarka Ivanova ; Pierre Tane ; Michael Spiteller
• 刊名：Journal of Natural Products
• 出版年：2011
• 出版时间：February 25, 2011
• 年：2011
• 卷：74
• 期：2
• 页码：272-278
• 全文大小：798K
• 年卷期：v.74,no.2(February 25, 2011)
• ISSN：1520-6025

文摘

Two new isopropenyl-dihydrofuranoisoflavones exhibiting antimicrobial properties have been isolated along with eight known compounds from the Cameroonian medicinal plant Crotalaria lachnophora. The structures of the new compounds were elucidated by 1D and 2D NMR spectroscopy and high-resolution mass spectrometry as 7,2鈥?4鈥?trihydroxy-5鈥测€?isopropenyl-4鈥测€?5鈥测€?dihydrofurano[2鈥测€?3鈥测€?5,6]isoflavone (1) and 4,8-dihydroxy-2-isopropenyl-2,3-dihydro-5H-[1]benzofuro[2,3-b]furo[3,2-g]chromen-5-one (2). The CH₂Cl₂/MeOH (1:1) extract and the compounds isolated were subjected to in vitro antimicrobial assays against a panel of pathogenic microorganisms, including Gram-positive and Gram-negative bacteria and fungi. The new compounds, named lachnoisoflavones A (1) and B (2), showed moderate inhibitory activities against Escherichia coli and Klebsiella pneumoniae.