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Structure determination of ursene-type triterpenes by NMR techniques

✍ Scribed by Zaheer Ahmed; Dildar Ali; Abdul Malik

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
99 KB
Volume
44
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

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.

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