title: 5-methylcoumaranones from Mutisia friesiana and their bioactivity.
abstract: In addition to the known mutisicoumaranones A (1) and B (2), the methanolic extract of the aerial parts of the shrub Mutisia friesiana afforded two new 5-methylcoumaranones, mutisicoumaranones C (3) and D (4). Their structures were elucidated by spectroscopic methods. (13)C NMR data for mutisicoumaranones A and B are reported for the first time. All compounds showed antifungal activity against the phytopathogenic fungus Cladosporium cucumerinum and bactericidal activity against Staphylococcus aureus. The presence of 5-methylcoumaranones A-D is biosynthetically related to 5-methylcoumarins and phenolic derivatives previously isolated from M. friesiana.
authors.affiliation: Facultad de Ingeniería, Universidad Nacional de Jujuy, Gorriti 237, 4600 S. S. de Jujuy, Jujuy, Argentina.
authors.forename: Carmen I
authors.initials: CI
authors.lastname: Viturro
authors.forename: Juana R
authors.initials: JR
authors.lastname: de la Fuente
authors.forename: Marta S
authors.initials: MS
authors.lastname: Maier
mesh_terms: D000935:Antifungal Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D001118:Argentina; D019659:Asteraceae / Q000737:chemistry*; D001572:Benzofurans / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002963:Cladosporium / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010946:Plants, Medicinal / Q000737:chemistry*; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D000935:Antifungal Agents; D001572:Benzofurans