Three minor novel triterpenoids from the leaves of Diospyros kaki.
Two novel 18, 19-secoursane triterpenoids, kakisaponin B (1) and kakisaponin C (2), an ursane type 28-nortriterpene, kakidiol (3) and one known triterpenoid rosamultin (4), were isolated from the leaves of Diospyros kaki. The structures of compounds 1 and 2 were determined as 28-O-beta-D-glucopyranosyl-3alpha,19,24-trihydoxy-18,19-secours-11,13(18)-dien-28-oic acid (1) and 28-O-beta-D-glucopyranosyl-2alpha,3alpha,19-trihydoxy-18,19-secours-11,13(18)-dien-28-oic acid (2) by chemical methods and spectra experiments. Kakidiol (3) was characterized as a C(29)-triterpene with an aromatic E-ring in structure. This is the first report of 18,19-secoursane triterpenoids and 28-nortriterpene from family Ebenaceae.
Chen
Guang
G
College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China. chenguang@mail.buct.edu.cn
Wang
Zong-Quan
ZQ
Jia
Ji-Ming
JM
D029788:Diospyros / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008516:Medicine, Chinese Traditional; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification
C540963:28-O-beta-D-glucopyranosyl-2alpha,3alpha,19-trihydoxy-18,19-secours-11,13(18)-dien-28-oic acid; C540964:28-O-beta-D-glucopyranosyl-3alpha,19,24-trihydoxy-18,19-secours-11,13(18)-dien-28-oic acid; D010936:Plant Extracts; D014315:Triterpenes; C540962:kakidiol; C051431:rosamultin