From the roots of Ligularia cymbulifera collected in Yunnan Province, China, two new eremophilane-type sesquiterpenoids (1 and 2) together with ten known compounds (3–12) were obtained through the precise chemical component elucidation. The structure determination was mainly carried out with 1D and 2D NMR data.
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4.
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9.
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11.
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17.
(a) IidaK., MitaniM., KurodaC. (2007) Fixation of natural furanoeremophilane by Diels-Alder reaction. Bulletin of the Chemical Society of Japan, 80, 966–971; (b) Torihata A, Kuroda C. (2008) Reaction of furanoeremophilans with pyridoxal. Natural Product Communications, 3, 1659–1662.
