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Complete 1H and 13C NMR assignments of two phytosterols from roots of Piper nigrum

✍ Scribed by Kun Wei; Wei Li; Kazuo Koike; Yuping Pei; Yingjie Chen; Tamotsu Nikaido

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
155 KB
Volume
42
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Using modern NMR techniques, including DQF‐COSY, NOESY, HETCOR and HMBC, the full assignments of all ^1^H and ^13^C chemical shifts were made for stigmastane‐3,6‐dione and stigmast‐4‐ene‐3,6‐dione, isolated from the roots of Piper nigrum (Piperaceae). Their stereochemistry was resolved by a combination of 2D NOESY data and analysis of coupling constants. The two compounds were isolated from the genus Piper for the first time. Copyright © 2004 John Wiley & Sons, Ltd.

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