Tricalysiosides H-O: Ent-kaurane glucosides from the leaves of Tricalysia dubia |
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Authors: | He Dong-Hui Matsunami Katsuyoshi Otsuka Hideaki Shinzato Takakazu Aramoto Mitsunori Bando Masahiko Takeda Yoshio |
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Institution: | Department of Pharmacognosy, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8551, Japan. |
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Abstract: | Eight ent-kaurane glucosides, named tricalysiosides H-O, were isolated from Tricalysia dubia. Tricalysioside H possessed a hydroxyl group at the 1-position, to which the glucose moiety was attached. The structure was first elucidated by means of spectroscopic data analysis and finally confirmed by X-ray crystallography. Since acid hydrolysis of 1 gave D-glucose, the aglycone was proved to have an enantio-kaurane type skeleton. The structures of tricalysiosides I-O were mainly elucidated from analysis of spectroscopic evidence. |
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Keywords: | Tricalysia dubia Rubiaceae Ent-kaurane glucoside Tricalysiosides H-O X-ray analysis |
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