title: Structure elucidation and NMR assignments for curcuminoids from the rhizomes of Curcuma longa.
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.
authors: Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
authors: Wei
authors: W
authors: Li
authors: Shisheng
authors: S
authors: Wang
authors: Jiatao
authors: J
authors: Feng
authors: Yuansheng
authors: Y
authors: Xiao
authors: Xingya
authors: X
authors: Xue
authors: Hui
authors: H
authors: Zhang
authors: Yaqin
authors: Y
authors: Wang
authors: Xinmiao
authors: X
authors: Liang
mesh_terms: D030024:Curcuma / Q000737:chemistry*; D003474:Curcumin / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D012015:Reference Standards; D027343:Rhizome / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D003474:Curcumin