Phytochemical and chemotaxonomic study on Ziziphus Jujuba Mill. (Rhamnaceae)

Fourteen compounds were isolated from fruits of Ziziphus jujuba Mill., including two flavonoids (1-2), one phenolic glycosides (3), one lignan (4), four phenols (5-8), three alkaloid (9-10, 14), three sesquiterpenoid (11-13). The structures of all the compounds were established by the NMR techniques, as well as by comparison with previously reported data in literature. Compounds 2 ''-glucosyl-8-C-glucosyl-4'-O-methylapigenin (1), 3', 4', 5'-trimethoxycinnamyl alcohol (5), 2-{4-[(1E)-3-Hydroxyprop-1-en-1-yl]-2, 6-dimethoxy-phenoxy}propane-1, 3-diol (6), 1-(4-Hydroxyphenyl)ethane-1, 2-diol (8), (1S, 3S)-1-Methyl-1, 2, 3, 4-tetrahydro-beta-carboline-3-carboxylic acid (9), (1R, 3S)-1-Methyl-1, 2, 3, 4-tetrahydro-beta-carboline-3-carboxylic acid (10), grasshopper ketone (12), methyl (3R, 5R)-5-methoxy-3-phenylisoxazolidine-5-carboxylate (14) were firstly reported from the genus Ziziphus and the family Rhamnaceae. Furthermore, the chemotaxonomic significance of the isolates was discussed.