title: Bioactive 1,4-dihydroxy-5-phenyl-2-pyridinone alkaloids from Septoria pistaciarum.
abstract: Four new 1,4-dihydroxy-5-phenyl-2-pyridinone alkaloids (1-4) were isolated from an EtOAc extract of a culture medium of Septoria pistaciarum. The structures of these compounds were determined by spectroscopic methods, and the absolute configuration of the major compound (1) was determined by X-ray crystallographic analysis. Compound 1 exhibited moderate in vitro antiplasmodial (antimalarial) activity against chloroquine-sensitive (D6) and -resistant (W2) strains of Plasmodium falciparum and cytotoxic activity to Vero cells. Compound 2 was moderately active against both methicillin-sensitive and methicillin-resistant strains of Staphylococcus aureus.
authors.affiliation: National Center for Natural Products Research, Research Institute of Pharmaceutical Sciences, and Department of Pharmacognosy, School of Pharmacy, The University of Mississippi, University, MS 38677, USA.
authors.forename: Mallika
authors.initials: M
authors.lastname: Kumarihamy
authors.forename: Frank R
authors.initials: FR
authors.lastname: Fronczek
authors.forename: Daneel
authors.initials: D
authors.lastname: Ferreira
authors.forename: Melissa
authors.initials: M
authors.lastname: Jacob
authors.forename: Shabana I
authors.initials: SI
authors.lastname: Khan
authors.forename: N P Dhammika
authors.initials: NP
authors.lastname: Nanayakkara
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000818:Animals; D000962:Antimalarials / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D001203:Ascomycota / Q000737:chemistry*; D002522:Chlorocebus aethiops; D002738:Chloroquine / Q000494:pharmacology; D018360:Crystallography, X-Ray; D055624:Methicillin-Resistant Staphylococcus aureus / Q000187:drug effects; D008968:Molecular Conformation; D015394:Molecular Structure; D010963:Plasmodium falciparum / Q000187:drug effects; D011728:Pyridones / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*
chemical_list: D000470:Alkaloids; D000962:Antimalarials; D011728:Pyridones; D002738:Chloroquine