Triterpenoid Ketones from Lingnania chungii MCCLURE: Arborinone, Friedelin and Glutinone.

Abstract

The powder coating of a bamboo, Lingnania chungii MCCLURE (=Bambusa chungii) was found to be a rich source of the 3-oxo pentacyclic triterpenes (25% 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 friedelin is described. All proton and carbon-13 nuclear magnetic resonance signals for arborinone, friedelin and glutinone were assigned.