Complete 1H and 13C NMR assignments of two phytosterols from roots of Piper nigrum |
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| Authors: | Wei Kun Li Wei Koike Kazuo Pei Yuping Chen Yingjie Nikaido Tamotsu |
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| Institution: | School of Chinese Traditional Medicine, Shenyang Pharmaceutical University, Shenyang 110016, China. |
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| Abstract: | Using modern NMR techniques, including DQF-COSY, NOESY, HETCOR and HMBC, the full assignments of all 1H and 13C 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. |
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| Keywords: | NMR 1H NMR 13C NMR stereochemistry stigmastane‐3 6‐dione stigmast‐4‐ene‐3 6‐dione Piper nigrum Piperaceae |
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