A New Prenylated Isoflavone from Tephrosia tinctoria. -The title compound (I) is isolated from the roots of Tephrosia tinctoria and represents the rare occurrence of an O-geranylated isoflavone from a natural source. -(REDDY, B. A. K.; KHALIVULLA, S. I.; GUNASEKAR*, D.; Indian J.

Two new geranyl flavanones, (2S)-5,4'-dihydroxy-7-O-[(E)-3,7-dimethyl-2,6-octadienyl]flavanone and (2S)-5,4'-dihydroxy-7-O-[(E)-3,7-dimethyl-2,6-octa-dienyl]-8-C-[(E)-3,7-dimethyl-2,6-octadienyl]flavanone, together with three known compounds, 7-O-methylglabranin, tephcalostan and 12a-dehydro-6-hydroxysumatrol, were isolated from the roots of Tephrosia villosa. The structures of these compounds were determined by extensive spectral studies.

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Two new flavanones, (2S)-5-hydroxy-7,4′-di-O-(γ,γ-dimethylallyl)flavanone (1) and 6-hydroxy-E-3-(2,5-dimethoxybenzylidine)-2′,5′-dimethoxyflavanone (2), together with three known compounds, tephrowatsin C, afrormosin and kaempferol 3-O-β-D-glucopyranoside were isolated from the roots of Tephrosia calophylla. The structures of 1 and 2 were established by extensive 2D NMR spectral studies.