Microtropiosides A-F: ent-Labdane diterpenoid glucosides from the leaves of Microtropis japonica (Celastraceae).
From a 1-BuOH-soluble fraction of a MeOH extract of the leaves of Microtropis japonica, collected in the Okinawa islands, six ent-labdane glucosides, named microtropiosides A-F, were isolated together with one known acyclic sesquiterpene glucoside. Their structures were elucidated by a combination of spectroscopic analyses, and their absolute configurations determined by application of the beta-D-glucopyranosylation-induced shift-trend rule in (13)C NMR spectroscopy and the modified Mosher's method.
Department of Pharmacognosy, Graduate School of Biomedical Sciences, Hiroshima University, Minami-ku, Hiroshima, Japan.
Yuka
Y
Koyama
Katsuyoshi
K
Matsunami
Hideaki
H
Otsuka
Takakazu
T
Shinzato
Yoshio
Y
Takeda
D029753:Celastraceae / Q000737:chemistry*; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification; D006027:Glycosides / Q000737:chemistry*; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry; D018515:Plant Leaves
D004224:Diterpenes; D006027:Glycosides; D010936:Plant Extracts; C433017:labdane