Triterpenoid Ketones from Lingnania chungii McClure: Arborinone, Friedelin and Glutinone
The powder coating of a bamboo, Lingnania chungii McClure (= Bambusa chungii) was found to be a rich source of the 3-oxo pentacyclic triterpenes (25percent on the recovery basis by chromatography on silica gel) which contained friedelin, arborinone and glutinone as the major components accompanied by minor amounts of α- and β-amyrenones.A simple procedure for isolation of the friedelin is described.All proton and carbon-13 nuclear magnetic resonance signals for arborinone, friedelin and glutinone were assigned.Keywords Lingnania chungii; Bambusa chungii; Gramineae; arborinone; friedelin; glutinone; 1H-NMR; 13C-NMR
Two new triterpenoids were isolated together with β-amyrin acetate, taraxeryl acetate, lupenyl acetate, 3β-acetoxy-30-norlupan-20-one- α-amyrenonol and sitosterol from the whole herb of Euphorbia maculata.The structures of the new compounds were characterized as gult-5-en-3β-yl acetate, and ursa-9(11):12-dien-3β-ol on the basis of chemical and spectral evidence.Key Word Index-Euphorbia maculata; Euphorbiaceae; β-amyrin acetate; taraxeryl acetate; lupenyl acetate; 3β-acetoxy-30-norlupan-20-one; α-amyrenonol; gult-5-en-3β-yl acetate; ursa-9 (11):12-dien-3β-ol; sitosterol.
Matsunaga, Shunyo,Tanaka, Reiko,Akagi, Masao
p. 535 - 538
(2007/10/02)
D:B-FRIEDOOLEAN-5-ENE-3β,29-DIOL, AN ANGULAR METHYL OXYGENATED D:B-FRIEDOOLEANENE FROM ELAEODENDRON BALAE
Key Word Index - Elaeodendron balae; Celastraceae; D:B-friedoolean-5-ene-3β,29-diol. - A new dioxygenated D:B-friedooleanene from Elaeodendron balae root bark was shown to be D:B-friedoolean-5-ene-3β,29-diol by relating it to 29-oxygenated D:A-friedooleanane.This is the first report of angular methyl oxygenation in the D:B-friedooleananes.