Structure elucidation of olasubscorpioside C, a new rotameric biflavonoid glycoside from the stem barks of Olax subscorpioidea (Oliv)

Magn Reson Chem. 2023 Aug;61(8):497-503. doi: 10.1002/mrc.5375. Epub 2023 Jun 21.

Abstract

From the n-butanol soluble fraction of the ethanol extract of the medicinal plant Olax subscorpioidea, a previously unreported rotameric biflavonoid glycoside constituted of 4'-O-methylgallocatechin-(4α → 8)-4'-O-methylgallocatechin as aglycone named olasubscorpioside C (1) along with the known 4'-O-methylgallocatechin (2) were isolated. Their structures were determined on the basis of spectrometric and spectroscopic techniques including HRFABMS, 1 H and 13 C NMR, DEPT 135o , HSQC, HMBC, ROESY, and CD followed by comparison with the reported data.

Keywords: 1D NMR; 2D NMR; Olax subscorpioidea; biflavonoid; gallocatechin; prodelphinidin; rotamer; structure elucidation.

Publication types

  • Letter
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Biflavonoids*
  • Ethanol
  • Glycosides* / chemistry
  • Magnetic Resonance Spectroscopy
  • Molecular Structure
  • Plant Extracts / chemistry

Substances

  • Glycosides
  • Biflavonoids
  • Plant Extracts
  • Ethanol