Tricalysiosides P-U: Ent-kaurane glucosides and a labdane glucoside from leaves of Tricalysia dubia OHWI |
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Authors: | Otsuka Hideaki Shitamoto Junko He Dong-Hui Matsunami Katsuyoshi Shinzato Takakazu Aramoto Mitsunori Takeda Yoshio Kanchanapoom Tripetch |
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Institution: | Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima 734-8553, Japan. hotsuka@hiroshima-u.ac.jp |
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Abstract: | Further extensive isolation work on the 1-BuOH-soluble fraction of a MeOH extract of Tricalysia dubia afforded five new ent-kaurane glucosides (4-8) and one new labdane glucoside (9), together with a known megastigmane glucoside, sammangaoside B (1), and monoterpene glucosides (2, 3). The structures of the new compounds were elucidated by analyses of one- and two-dimensional NMR spectroscopic data. The absolute configuration of the 9-position of sammangaoside B was revised to S and its total stereochemistry was established by the modified Mosher's method. |
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