title: New cucurbitane triterpenoids and steroidal glycoside from Momordica charantia.
abstract: Three new cucurbitane triterpenoids 1-3 and one new steroidal glycoside 4, were isolated together with ten known compounds from Momordica charantia. The structures of new compounds were determined to be 19(R)-n-butanoxy-5 beta,19-epoxycucurbita-6,23-diene-3beta,25-diol 3-O-beta-glucopyranoside (1), 23-O-beta-allopyranosylecucurbita-5,24-dien-7 alpha,3beta,22(R),23(S)-tetraol 3-O-beta-allopyranoside. (2), 23(R),24(S),25-trihydroxycucurbit-5-ene 3-O-{[beta-glucopyranosyl(1-->6)]-O-beta-glucopyranosyl}-25-O-beta-glucopyranoside (3), and 24(R)-stigmastan-3beta,5 alpha,6 beta-triol-25-ene 3-O-beta-glucopyranoside (4), respectively. Their structures were elucidated by the combination of mass spectrometry (MS), one and two-dimensional NMR experiments and chemical reactions.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Science, Kunming 650204 Yunnan, China. jqliu18@163.com
authors.forename: Jie-Qing
authors.initials: JQ
authors.lastname: Liu
authors.forename: Jian-Chao
authors.initials: JC
authors.lastname: Chen
authors.forename: Cui-Fang
authors.initials: CF
authors.lastname: Wang
authors.forename: Ming-Hua
authors.initials: MH
authors.lastname: Qiu
mesh_terms: D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D029777:Momordica charantia / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013256:Steroids / Q000737:chemistry / Q000302:isolation & purification*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D006027:Glycosides; D013256:Steroids; D014315:Triterpenes