title: Natural and synthetic 2,2-dimethylpyranocoumarins with antibacterial activity.
abstract: A new efficient synthetic approach to the natural coumarins 5-hydroxyseselin (5), 5-methoxyseselin (3), and (+/-) cis-grandmarin (9) is described as well as the synthesis of some new derivatives in the 5-methoxyseselin series (10-15). The natural coumarins 7-hydroxyalloxanthyletin (6), alloxanthoxyletin (8), and dipetalolactone (7) have also been obtained as secondary products. The type of fusion of the pyrano ring in all cases has been established by 2D NMR spectroscopy. The compounds have been studied for their in vitro antibacterial activity, which has been compared with that of some previously synthesized seselin derivatives. The most active compounds were 3, 7, 8, 11, and 14. Some structure-activity relationships are discussed.
authors.affiliation: Division of Pharmacognosy and Natural Products Chemistry, Department of Pharmacy, University of Athens, Panepistimiopolis, Zografou, GR-15771 Athens, Greece.
authors.forename: Eleni
authors.initials: E
authors.lastname: Melliou
authors.forename: Prokopios
authors.initials: P
authors.lastname: Magiatis
authors.forename: Sofia
authors.initials: S
authors.lastname: Mitaku
authors.forename: Alexios-Leandros
authors.initials: AL
authors.lastname: Skaltsounis
authors.forename: Efrosini
authors.initials: E
authors.lastname: Chinou
authors.forename: Ioanna
authors.initials: I
authors.lastname: Chinou
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002957:Citrus / Q000737:chemistry; D003374:Coumarins / Q000138:chemical synthesis / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010946:Plants, Medicinal / Q000737:chemistry*; D013329:Structure-Activity Relationship; D032106:Zanthoxylum / Q000737:chemistry
chemical_list: D000900:Anti-Bacterial Agents; D003374:Coumarins