title: New dibenz[b, f]oxepins from Cercis chinensis Bunge.
abstract: Three new dibenz[b,f]oxepins: 6-methoxy-7-methyl-8-hydroxydibenz[b, f]oxepin (1), 1,8-dimethoxy-6-hydroxy-7-methyldibenz[b, f]oxepin (2), and 1-hydroxy-6,8-dimethoxy-7-methyldibenz[b,f]oxepin (3), along with two known dibenz[b,f]oxepins pacharin (4) and bauhiniastatin 4 (5), were isolated from Cercis chinensis Bunge (Leguminosae). Their structures were elucidated on the basis of spectroscopic evidence (EI-MS, UV, IR, (1)H, (13)C and 2D NMR). Compounds 1-5 were isolated from the Cercis genus for the first time.
authors.affiliation: Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Materia Medica, Chinese Academy of Medical Sciences, Beijing, China.
authors.forename: Li-Hua
authors.initials: LH
authors.lastname: Mu
authors.forename: Jian-Bei
authors.initials: JB
authors.lastname: Li
authors.forename: Jing-Zhi
authors.initials: JZ
authors.lastname: Yang
authors.forename: Dong-Ming
authors.initials: DM
authors.lastname: Zhang
mesh_terms: D007887:Fabaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010082:Oxepins / Q000737:chemistry / Q000302:isolation & purification*; D021241:Spectrometry, Mass, Electrospray Ionization; D013056:Spectrophotometry, Ultraviolet
chemical_list: D010082:Oxepins