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Complete 1 H and 13 C NMR assignments of sesquiterpene glucosides from Ixeris sonchifolia
Author(s) -
Na ZeyEi,
Cho JeongYong,
Lee Hyoung Jae,
Chung Jin Ho,
Park Ki Deok,
Lee Young Ju,
Shin Soo Cheol,
Rim Yo Sup,
Park KeunHyung,
Moon JaeHak
Publication year - 2007
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1953
Subject(s) - chemistry , sesquiterpene , carbon 13 nmr , stereochemistry
Abstract Four sesquiterpene glucosides were isolated from Ixeris sonchifolia Hance. The structure of a new compound (1) was assigned as 9β‐monohydroxy‐2,12‐dioxo‐guaia‐3,11(13)‐dien‐1α,5α,6β,7α,9β,10αH‐12,6‐olide‐9‐ O ‐β‐ D ‐ glucopyranoside (ixerinoside). In addition, unambiguous and complete assignments of 1 H NMR chemical shifts for crepidiaside A (2), ixerin Z (3), and 11,13α‐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. Copyright © 2007 John Wiley & Sons, Ltd.