title: Cycloartane type triterpenoids from the rhizomes of Polygonum bistorta.
abstract: Two new compounds, 24(E)-ethylidenecycloartanone (1) and 24(E)-ethylidenecycloartan-3alpha-ol (2) were isolated from the rhizomes of Polygonum bistorta, together with seven known compounds viz., cycloartane-3,24-dione (3), 24-methylenecycloartanone (4), gamma-sitosterol (5), beta-sitosterol (6), beta-sitosterone (7), friedelin (8) and 3beta-friedelinol (9). All the cycloartane type triterpenoids, compounds 7 and 8 are reported for the first time from this plant. A combination of 1D and 2D NMR spectroscopy and MS were mainly used to elucidate the structures of the new compounds 1 and 2.
authors.affiliation: Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore.
authors.forename: Karuppiah Pillai
authors.initials: KP
authors.lastname: Manoharan
authors.forename: Tan Kwong Huat
authors.initials: TK
authors.lastname: Benny
authors.forename: Daiwen
authors.initials: D
authors.lastname: Yang
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D028502:Polygonum / Q000737:chemistry*; D027343:Rhizome / Q000737:chemistry; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D014315:Triterpenes; C085352:cycloartane