title: Several chromones from the stems of Polygonum aubertii Henry.
abstract: Two new 2-alkylchromanones, 2-tricosyl-2,5,7-trihydroxy-chromanone (6) and 2-pentacosyl-2,5,7-trihydroxy-chromanone (7), together with five known 2-alkylated chromones and chromanones (1-5), were isolated from the stems of Polygonum aubertii Henry. The structures of these compounds were established by spectroscopic methods including extensive 1D, 2D NMR ((1)H-(1)H COSY, HSQC, and HMBC), and HR-ESI-MS techniques. In addition, a plausible biosynthetic pathway for these compounds is described.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, China.
authors.forename: Ya-Min
authors.initials: YM
authors.lastname: Zhao
authors.forename: Huan-Yang
authors.initials: HY
authors.lastname: Qi
authors.forename: Yan-Ping
authors.initials: YP
authors.lastname: Shi
mesh_terms: D002867:Chromones / Q000737:chemistry / Q000302:isolation & purification*; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018547:Plant Stems / Q000737:chemistry; D028502:Polygonum / Q000737:chemistry*
chemical_list: C551221:2-pentacosyl-2,5,7-trihydroxy-chromanone; C551220:2-tricosyl-2,5,7-trihydroxychromanone; D002867:Chromones; D004365:Drugs, Chinese Herbal