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Complete assignments of 1H and 13C NMR spectral data for three polyhydroxylated 12-ursen-type triterpenoids from Dischidia esquirolii

✍ Scribed by Xiaoxia Ma; Chongren Yang; Yingjun Zhang

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
119 KB
Volume
46
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The complete assignments of all the ^1^H and ^13^C NMR signals of three polyhydroxylated 12‐ursen‐type triterpenes, 6β,19α,22α‐trihydroxyurs‐12‐en‐3‐oxo‐28‐oic acid (1), 3β,6α,19α,23‐tetrahydroxyurs‐12‐en‐28‐ oic acid (2) and 3β,6β,19α,23‐tetrahydroxyurs‐12‐en‐28‐oic acid (3), were carried out by means of homo‐ and hetero‐nuclear two‐dimensional NMR experiments. Compounds 1–3 were isolated from the aerial parts of Dischidia esquirolii. Of them, 1 and 2 were identified as new polyhydroxylated ursolic acid derivatives. Compound 2 is the C‐6 hydroxyl epimer of 3, which was isolated first from Adina rubella, and its structure is revised in this paper. Copyright © 2008 John Wiley & Sons, Ltd.

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