Biflavonoid toxicarine, rotenoids and a flavanone from the roots of Tephrosia toxicaria

Abstract

For the first time the structural determination of the biflavonoid, 4-H-2,3-dihydro-1-benzopyran-4-one-6-[2-phenyl-8-(3-methyl-2-butenyl)-5,7-dimethoxy-2-H-3,4-dihydro-1-benzopiran-4-yl)-5,7-dihydroxy-8-(3-methyl-2-butenyl)-2-phenyl, named toxicarine (1) is presented, joined the isolation of the flavanone 7-O-methylglabranine (2) and a mixture of the rotenoids tephrosin (3) and rotenolone (4) from the roots of Tephrosia toxicaria (Sw.) Pers. Their structures were established by spectroscopic methods, meanly spectral data obtained by analysis of 1H and 13C NMR (1D and 2D) spectra.

Keywords

• tephrosia toxicaria
• fabaceae
• flavonoids
• roots.