Complete 1H and 13C NMR assignments of sesquiterpene glucosides from Ixeris sonchifolia.

Magnetic resonance in chemistry : MRC

PubMedID: 17221918

Na Z, Cho JY, Lee HJ, Chung JH, Park KD, Lee YJ, Shin SC, Rim YS, Park KH, Moon JH. Complete 1H and 13C NMR assignments of sesquiterpene glucosides from Ixeris sonchifolia. Magn Reson Chem. 2007;45(3):275-8.
Four sesquiterpene glucosides were isolated from Ixeris sonchifolia Hance. The structure of a new compound (1) was assigned as 9beta-monohydroxy-2,12-dioxo-guaia-3,11(13)-dien-1alpha,5alpha,6beta,7alpha,9beta,10alphaH-12,6-olide-9-O-beta-D- glucopyranoside (ixerinoside). In addition, unambiguous and complete assignments of (1)H NMR chemical shifts for crepidiaside A (2), ixerin Z (3), and 11,13alpha-dihydroixerin Z (4) are presented. The assignments were achieved by two-dimensional NMR (gCOSY, gHSQC, gHMBC, NOESY) and one-dimensional nuclear Overhauser effect (NOE) experiments.