Xanthones and coumarins from Kielmeyera lathrophyton
نویسندگان
چکیده
منابع مشابه
Antibacterial xanthones from Kielmeyera variabilis mart. (Clusiaceae).
The bioassay-guided fractionation of stems from Kielmeyera variabilis, traditionally used in Brazilian folk medicine, yielded assiguxanthone-B (1), kielcorin (4), 2,5-dihydroxybenzoic acid (3), and a mixture of xanthones containing assiguxanthone-B (1) and 1,3,5,6-tetrahydroxy-2-prenylxanthone (2) (1:1 w/w). The xanthone mixture inhibited Staphylococcus aureus and Bacillus subtilis at a concent...
متن کاملCoumarins, Xanthones and Related Compounds.
It has long been known that coumarins (α-pyrones) and xanthones (γ-pyrones) together form a large class of naturally occurring compounds exhibiting a wide range of biological activities. However, the interest of the scientific community for these secondary metabolites, as well as for their structural analogues, has never decreased since these “old compounds” are constantly generating promising—...
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Uma cumarina inédita, mammea E/BB ciclo D (1), juntamente com cinco compostos conhecidos, mammea E/BA ciclo D (2), suragina C (3), terapina B (4), 1,7-dihidroxixantona (5) e 1-hidróxi-5-metoxyxantona (6), foram isolados de sementes de Mammea siamensis. Suas estruturas foram caracterizadas usando dados de RMN 1D e 2D. Suragina C e terapina B mostraram atividade citotóxica contra adenocarcinoma d...
متن کاملCoumarins from Edgeworthia chrysantha.
A new coumarin, edgeworic acid (1), was isolated from the flower buds of Edgeworthia chrysantha, together with the five known coumarins umbelliferone (2), 5,7-dimethoxycoumarin (3), daphnoretin (4), edgeworoside C (5), and edgeworoside A (6). Their structures were established on the basis of spectral data, particularly by the use of 1D NMR and several 2D shift-correlated NMR pulse sequences (1H...
متن کاملSecoiridoids and xanthones from Tylophora secamonoides Tsiang.
A new secoiridoid, secamonoide A (1), and a new xanthone glycoside, secamonoide B (2), together with nine known compounds, were isolated from the aerial parts of Tylophora secamonoides Tsiang. Their structures were elucidated on the basis of spectroscopic methods. An antimicrobial bioassay showed that secamonoides A and B exhibited weak activities (MIC values greater than 100 mg/ml) against som...
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ژورنال
عنوان ژورنال: Journal of the Brazilian Chemical Society
سال: 2001
ISSN: 0103-5053
DOI: 10.1590/s0103-50532001000100016