Two new isoflavonoids from the roots of Dalbergia congesta (Grah)

Abstract

A systematic examination of the roots of Dalbergia congesta, yielded a new oligomeric isoflavonoid (1), a new tetramethoxy isoflavone (2) along with two known compounds, an isoflavone dalspinin (3) and a benzophenone, cearoin (4). On the basis of chemical and spectral evidences, compounds 1 and 2 were determined to be 5,7-dihydroxy-6,4′-dimethoxy-6′[2″-hydroxy-2″(2‴,5‴-dimethoxy neoflavonyl) ethenyl] isoflavone (dalcongestin) and 5,7-dihydroxy-2′,3′,5′,6′-tetramethoxy isoflavone, respectively.

Keywords:

• Dalbergia congesta
• Leguminosae
• Oligomeric isoflavonoids
• Flavonoids

Acknowledgements

The authors wish to thank Dr. V. Renuka, KFRI, Peechi for the identification of the plant, SIF, IISc, Bangalore for recording the NMR spectra and the LCRC, Bangalore for recording the mass spectra. One of the authors, Priya R. Rao wishes to thank the authorities of GRI for providing scholarship.