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  • Title: Two new 2'-oxygenated flavones from Andrographis elongata.
    Author: Jayakrishna G, Harikishore P, Rao CV, Gunasekar D, Blond A, Bodo B.
    Journal: Chem Pharm Bull (Tokyo); 2001 Dec; 49(12):1555-7. PubMed ID: 11767074.
    Abstract:
    Two new 2'-oxygenated flavones, 5,2',6'-trihydroxy-7-methoxyflavone (3) and skullcapflavone I 2'-O-beta-D-(4"-E-cinnamyl) glucopyranoside (5), together with three known flavones, 7-O-methylwogonin (1), skullcapflavone I (2) and skullcapflavone I 2'-O-beta-D-glucopyranoside (4) were isolated from the whole plant of Andrographis elongata, and the structures were elucidated by FAB-MS and one- and two-dimensional (1D- and 2D)-NMR spectral studies including 1H-1H correlation spectroscopy (COSY), heteronuclear single quantum coherence (HSQC), heteronuclear multiple bond connectivity (HMBC) and rotating frame Overhauser enhancement spectroscopy (ROESY) experiments, and chemical studies.
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