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Structure elucidation and NMR assignments for curcuminoids from the rhizomes of Curcuma longa

✍ Scribed by Wei Li; Shisheng Wang; Jiatao Feng; Yuansheng Xiao; Xingya Xue; Hui Zhang; Yaqin Wang; Xinmiao Liang

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
275 KB
Volume
47
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Thirteen curcuminoids (1–13) were isolated from the rhizomes of Curcuma longa. Among them, 1,5‐dihydroxy‐1,7‐bis(4‐hydroxyphenyl)‐4,6‐heptadiene‐3‐one (1), 1,5‐dihydroxy‐1‐(4‐hydroxy‐3‐methoxyphenyl)‐7‐(4‐hydroxyphenyl)‐4,6‐heptadiene‐3‐one (2), 1,5‐dihydroxy‐1‐(4‐hydroxyphenyl)‐7‐(4‐hydroxy‐3‐methoxyphenyl)‐4,6‐heptadiene‐3‐one (3), and 3‐hydroxy‐1,7‐bis‐(4‐hydroxyphenyl)‐6‐heptene‐1,5‐dione (4) are new compounds, and 1‐(4‐hydroxyphenyl)‐7‐(3, 4‐dihydroxyphenyl)‐1, 6‐heptadiene‐3, 5‐dione (5) is isolated from natural sources for the first time. The structures of these compounds were elucidated by extensive spectroscopic analyses, especially 1D and 2D NMR spectroscopy. The ^13^C NMR data and complete ^1^H and ^13^C NMR assignments of some known compounds are reported for the first time. In addition, the errors of ^1^H and ^13^C assignments reported in the literature were corrected. Copyright © 2009 John Wiley & Sons, Ltd.

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