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Complete 1 H and 13 C NMR assignments of two phytosterols from roots of Piper nigrum
Author(s) -
Wei Kun,
Li Wei,
Koike Kazuo,
Pei Yuping,
Chen Yingjie,
Nikaido Tamotsu
Publication year - 2004
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.1347
Subject(s) - piperaceae , chemistry , piper , two dimensional nuclear magnetic resonance spectroscopy , stereochemistry , proton nmr , dept , carbon 13 nmr , botany , biology
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.