RESUMO
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.
Assuntos
Glicosídeos/química , Plantas/química , Triterpenos/química , Sequência de Carboidratos , Glicosídeos/isolamento & purificação , Espectrometria de Massas , Dados de Sequência Molecular , Estrutura Molecular , Ressonância Magnética Nuclear Biomolecular , Raízes de Plantas/química , Espectrometria de Massas de Bombardeamento Rápido de Átomos , Triterpenos/isolamento & purificaçãoRESUMO
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.
