Cucurbitacins from Cayaponia racemosa: isolation and total assignment of 1H and 13C NMR spectra

Magn Reson Chem. 2007 May;45(5):389-92. doi: 10.1002/mrc.1970.

Abstract

Two new cucurbitane-type triterpenoids, 2beta,3beta,16alpha,20(R),25-pentahydroxy-9-methyl-19-norlanost-5-en-7,22-dione and 2beta,3beta,16alpha,20(R),25-pentahydroxy-9-methyl-19-norlanost-5-en-7,11,22-trione, were isolated from fruits of Cayaponia racemosa. The total (1)H and (13)C chemical shift assignment of these two closely related compounds is described, making use of one- and two-dimensional NMR techniques.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carbon Isotopes
  • Cucurbitaceae / chemistry*
  • Cucurbitacins
  • Fruit / chemistry*
  • Magnetic Resonance Spectroscopy
  • Molecular Structure
  • Protons
  • Triterpenes / chemistry*

Substances

  • 2,3,16,20,25-pentahydroxy-9-methyl-19-norlanost-5-en-7,11,22-trione
  • 2,3,16,20,25-pentahydroxy-9-methyl-19-norlanost-5-en-7,22-dione
  • Carbon Isotopes
  • Protons
  • Triterpenes
  • Cucurbitacins