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
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.
Weeratunga, Gamini,Kumar, Vijaya
p. 2369 - 2372
(2007/10/02)
Terpenoids and Related Compounds: Part XXXI - Stereospecific Reduction of Triterpenoid Ketones with Lithium and Ethylenediamine
Hindered triterpenoid ketones are reduced in excellent yields to the corresponding thermodynamically more stable alcohols on stereospecific reduction with lithium and ethylenediamine.
Sengupta, Pasupati,Das, Saktipada,Das, Kanchan
p. 1113 - 1114
(2007/10/02)
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