Dalsympathetin – a new isoflavone gentiobioside from Dalbergia sympathetica (Dennst.)

Abstract

Two isoflavonoids isolated from Dalbergia sympathetica were identified as 5,4′-dihydroxy-7-methoxyisoflavone (1) (Prunetin) and Prunetin-4′-O-β-D-gentiobioside (2) (Dalsympathetin). The natural occurrence of Dalsympathetin is reported for the first time. The position of glycosylation in Dalsympathetin at 4′-position has been confirmed by 2D-NMR spectral studies.

Keywords:

• Dalbergia sympathetica
• Dalsympathetin
• Prunetin diglycoside

Acknowledgements

The authors thank SIF, IISc, Bangalore, India for the NMR spectra, KFRI, Peechi, Trichur, India for identifying the plant material and Mr. K. Muralidharan, IdI, India for his help. One of the authors (CNM) thank R.D. Birla Smarak Kosh, Mumbai for the financial assistance during his Ph.D programme.