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Structure determination of ursene‐type triterpenes by NMR techniques
Author(s) -
Ahmed Zaheer,
Ali Dildar,
Malik Abdul
Publication year - 2006
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.1803
Subject(s) - chemistry , terpene , stereochemistry , computational chemistry
Two new ursene‐type triterpenes, nudicauline A and nudicauline B, have been isolated from Launaea nudicaulis . Their structures have been assigned as 3β‐hydroxy‐urs‐11‐ene (1) and 3β‐acetyl‐urs‐11‐ene (2), respectively, by extensive NMR studies. In addition, olean‐11,13(18)‐diene (3), 3β‐hydroxy‐13(28)‐epoxy‐urs‐11‐ene (4) and 3‐keto‐13(28)‐epoxy‐urs‐11‐ene (5) are also reported for the first time from this species. Copyright © 2006 John Wiley & Sons, Ltd.