title: Two new butenolide derivatives from Saussurea katochaete.
abstract: Two new butenolide derivatives, (4R,7R*/S*)-2, 4-dimethyl-4- (1'-acetyl-3'-oxobutyl)-2- butenolide and its epimer, (4R,7S*/R*)-2, 4-dimethyl-4- (1'-acetyl-3'-oxobutyl)-2- butenolide were isolated from the acetone extract of the whole plant of Saussurea katochaete. Their structures were established by various spectral methods including IR, 1D-, 2D-NMR and HR-ESIMS. Four known compounds were also isolated and identified as 2, 4-dimethyl-4-hydroxy-2- butenolide, 3-hexene-2, 5-dione, 3-hydroxyhexane-2, 5-dione, 1-hydroxy-(Z)-3-hexene-2, 5-dione.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, P. R. China.
authors.forename: Ya
authors.initials: Y
authors.lastname: Li
authors.forename: Yan-Ping
authors.initials: YP
authors.lastname: Shi
mesh_terms: D002855:Chromatography, Thin Layer; D007783:Lactones / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D030441:Saussurea / Q000737:chemistry*; D012997:Solvents; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: C524120:(4R,7R*-S*)-2, 4-dimethyl-4-(1'-acetyl-3'-oxobutyl)-2- butenolide; D007783:Lactones; D012997:Solvents