title: Dibenzyl bromophenols with diverse dimerization patterns from the brown alga Leathesia nana.
abstract: Six novel dibenzyl bromophenols (1-6) with different dimerization patterns and two propyl bromophenol derivatives (7 and 8), together with 11 known bromophenol derivatives, were isolated from the ethanolic extract of the brown alga Leathesia nana. On the basis of spectroscopic methods the structures of the new compounds were determined as 5,6'-diethyloxymethyl-3,4,2'-tribromo-2,3',4'-trihydroxydiphenyl ether (1), 2-(2,3-dibromo-4,5-dihydroxybenzyl)-3,5-dihydroxy-4-methoxybenzyl alcohol (2), 6-(2,3-dibromo-4,5-dihydroxybenzyl)-2,3-dibromo-4,5-dihydroxy benzyl methyl ether (3), 9,10-dihydro-9,10-dimethoxy-3,4,7,8-tetrabromo-1,2,5,6-tetrahydroxyanthracene (4), (+)-3-(2,3-dibromo-4,5-dihydroxyphenyl)-4-bromo-5,6-dihydroxy-1,3-dihydroisobenzofuran (5), rel-(4aS,10aR)-(+/-)-6,7-dibromo-4a-hydroxy-3,8-dihydroxymethyl-10a-methoxy-1,4,4a,10a-tetrahydrodibenzo[b,e][1,4]dioxin-1-one (6), (E)-2-methyl-3-(2,3-dibromo-4,5-dihydroxyphenyl)propenal (7), and 2-methyl-3-(2,3-dibromo-4,5-dihydroxyphenyl)-1-propanol (8). Some compounds including 3 showed in vitro selective cytotoxicity against several human cancer cell lines. This is the first brown alga to be reported containing bromophenols.
authors.affiliation: Institute of Materia Medica, Chinese Academy of Medical Sciences, Beijing 100050, People's Republic of China.
authors.forename: Xiuli
authors.initials: X
authors.lastname: Xu
authors.forename: Fuhang
authors.initials: F
authors.lastname: Song
authors.forename: Sujuan
authors.initials: S
authors.lastname: Wang
authors.forename: Shuai
authors.initials: S
authors.lastname: Li
authors.forename: Fan
authors.initials: F
authors.lastname: Xiao
authors.forename: Jielu
authors.initials: J
authors.lastname: Zhao
authors.forename: Yongchun
authors.initials: Y
authors.lastname: Yang
authors.forename: Suqing
authors.initials: S
authors.lastname: Shang
authors.forename: Lü
authors.initials: L
authors.lastname: Yang
authors.forename: Jiangong
authors.initials: J
authors.lastname: Shi
mesh_terms: D002681:China; D018360:Crystallography, X-Ray; D019281:Dimerization; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D006842:Hydrocarbons, Brominated / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D000459:Phaeophyceae / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D013237:Stereoisomerism; D014407:Tumor Cells, Cultured
chemical_list: D006842:Hydrocarbons, Brominated; D010636:Phenols