Three ent-secoaromadendrane-type sesquiterpene hemiacetals and a bicyclogermacrene from Plagiochila ovalifolia and Plagiochila yokogurensis |
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Authors: | Yoshinori Asakawa Masao Toyota Tsunematsu Takemoto |
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Institution: | Institute of Pharmacognosy, Tokushima-Bunri University, Yamashirocho, 770 Tokushima, Japan |
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Abstract: | A new ent-secoaromadendrane-type sesquiterpene hemiacetal, plagiochiline G, was isolated from Plagiochila ovalifolia. Four new ent-sesquiterpene hemiacetals, plagiochiline H and I, and two pungent methoxyplagiochilines A1, A2 and non-pungent methoxyplagiochiline C were also isolated from P. yokogurensis. The methoxylated plagiochilines A1, A2 and C were derived from the plagiochilines A and C during the extraction procedure. A new germacrene, ent-3α-acetoxybicyclogermacrene, ent-maaliol and the previously known ent- aromadendrane-type sesquiterpenes have been obtained from P. yokogurensis. The structures of the new compounds were elucidated by 1H NMR spectral data and by chemical correlation. |
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Keywords: | Hepaticae plagiochilines G H and I |
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