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Two new 5-deoxyflavones from Albizia odoratissima
Yerra Koteswara Rao1, Mopur Vijaya Bhaskar Reddy, Chunduri Venkata Rao
1Natural Products Division, Department of Chemistry, Sri Venkateswara University, India.
Chemical & Pharmaceutical Bulletin
|September 19, 2002
Abstract:
Two new 5-deoxyflavones, 7,8-dimethoxy-3',4'-methylenedioxyflavone (1) and 7,2',4'-trimethoxyflavone (2) together with a known flavone, 7,4'-dimethoxy-3'-hydroxyflavone (3) were isolated from the rootbark of Albizia odoratissima. The structures of these new compounds were elucidated by electrospray ionization mass spectrometry (ESI-MS) and 1D and 2D-NMR spectral studies including (1)H-(1)H correlation spectroscopy (COSY), heteronuclear single quantum coherence (HSQC), heteronuclear multiple bond connectivity (HMBC) and nuclear Overhauser enhancement spectroscopy (NOESY).