The new homoisoflavanone R(-)-3-(4-hydroxybenzyl)-5-hydroxy-6, 7,8-trimethoxychroman-4-one (1) was isolated from the petroleum ether and the diethyl ether extracts of the bulbs of Veltheimia viridifolia (Hyacinthaceae) together with the known homoisoflavanone muscomin (2). The structures of the compounds were elucidated by means of 1H-NMR, 2D 1H-1H-COSY, 13C-NMR, HMQC, HMBC, mass, and CD spectra. Pharmacological testings of the new homoisoflavanone are reported.
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A new spirocyclic nortriterpene, 22-acetoxy-15-deoxo-eucosterol, was isolated together with a corresponding pentaglycoside from the bulbs of Veltheimia viridifolia. The structures of the isolated compounds were elucidated by spectroscopic methods including 1D- and 2D-1H NMR, 13C NMR, 1D-INEPT, 1D- and 2D-TOCSY, HSQC, HMBC, ROESY experiments, FAB- and HRESI-mass spectrometry.
View Article and Find Full Text PDFConstituents of Veltheimia viridifolia; I. Homoisoflavanones of the bulbs.
Planta Med
December 1996
Lehrstuhl für Pharmazeutische Chemie, Universität Freiburg, Germany.
The new homoisoflavanone R(-)-3-(4-hydroxybenzyl)-5-hydroxy-6, 7,8-trimethoxychroman-4-one (1) was isolated from the petroleum ether and the diethyl ether extracts of the bulbs of Veltheimia viridifolia (Hyacinthaceae) together with the known homoisoflavanone muscomin (2). The structures of the compounds were elucidated by means of 1H-NMR, 2D 1H-1H-COSY, 13C-NMR, HMQC, HMBC, mass, and CD spectra. Pharmacological testings of the new homoisoflavanone are reported.
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