Tricalysiosides H-O: Ent-kaurane glucosides from the leaves of Tricalysia dubia
2005
He, D.H. | Matsunami, K. | Otsuka, H. | Shinzato, T. | Aramoto, M. | Bando, M. | Takeda, Y.
Eight ent-kaurane glucosides, named tricalysiosides H-O (1-8), were isolated from Tricalysia dubia. Tricalysioside H (1) 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 (2-8) were mainly elucidated from analysis of spectroscopic evidence.
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