title: Antibacterial and cytotoxic activity of prenylated bicyclic acylphloroglucinol derivatives from Hypericum amblycalyx.
abstract: Two new bicyclic acylphloroglucinol derivatives, hypercalyxone A (1-[5,7-dihydroxy-2-methyl-3-(3-methyl-but-2-enyl)-2-(4-methyl-pent-3-enyl)-chroman-8-yl]-2-methyl-propan-1-one, 1) and B (1-[5,7-dihydroxy-2-methyl-3-(3-methyl-but-2-enyl)-2-(4-methyl-pent-3-enyl)-chroman-8-yl]-2-methyl-butan-1-one, 2), have been isolated from the petroleum ether extract of the aerial parts of Hypericum amblycalyx, together with two further compounds (1-[5,7-dihydroxy-2-methyl-2-(4-methyl-pent-3-enyl)-chroman-8-yl]-2-methyl-propan-1-one, 3 and 1-[5,7-dihydroxy-2-methyl-2-(4-methyl-pent-3-enyl)-chroman-8-yl]-2-methyl-butan-1-one, 4), which have been described only as semi-synthetic products. In addition, the known triterpene lup-20(29)-en-3-one was obtained. Structure elucidation was based on 1D and 2D NMR studies, as well as on data derived from mass spectrometry. The four acylphloroglucinol derivatives were evaluated for their cytotoxic and antibacterial activity. All compounds showed moderate cytotoxic activity against KB and Jurkat T cancer cells. Especially compounds 3 and 4 exhibited a strong antibacterial activity against different Gram-positive strains.
authors.affiliation: Institute of Pharmaceutical Sciences, Department of Chemistry and Applied BioSciences, Swiss Federal Institute of Technology (ETH) Zurich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
authors.forename: Karin
authors.initials: K
authors.lastname: Winkelmann
authors.forename: Metin
authors.initials: M
authors.lastname: San
authors.forename: Zacharias
authors.initials: Z
authors.lastname: Kypriotakis
authors.forename: Helen
authors.initials: H
authors.lastname: Skaltsa
authors.forename: Blazenka
authors.initials: B
authors.lastname: Bosilij
authors.forename: Jörg
authors.initials: J
authors.lastname: Heilmann
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D001578:Benzopyrans / Q000737:chemistry* / Q000302:isolation & purification / Q000633:toxicity*; D002470:Cell Survival / Q000187:drug effects*; D002478:Cells, Cultured; D003110:Colonic Neoplasms; D006367:HeLa Cells; D006801:Humans; D020902:Hypericum / Q000737:chemistry*; D019169:Jurkat Cells; D007624:KB Cells; D008826:Microbial Sensitivity Tests; D008958:Models, Molecular; D008968:Molecular Conformation; D035261:Plant Components, Aerial / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification / Q000633:toxicity; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D000890:Anti-Infective Agents; D001578:Benzopyrans; D010936:Plant Extracts