title: In vitro antiviral activity of the 6-substituted 2-(3',4'-dichlorophenoxy)-2H-pyrano[2,3-b]pyridines MDL 20,610, MDL 20,646, and MDL 20,957.
abstract: The 6-substituted 2-(3',4'-dichlorophenoxy)-2H-pyrano[2,3-b]pyridines MDL 20,610 (6-SO2CH3), MDL 20,646 (6-Br), and MDL 20,957 (6-Cl) are potent antirhinovirus compounds with median plaque 50% inhibitory concentrations (IC1/2s) of 0.03, 0.006, and 0.006 micrograms/ml, respectively, against the 32 serotypes evaluated. The 6-halogenated analogs produced 99% reductions in progeny virion yields at concentrations as low as 0.004 micrograms/ml. However, these analogs perturbated HeLa cell metabolism at lower concentrations (at or above 5 micrograms/ml) than did the 6-methylsulfonyl analog (at or above 20 micrograms/ml). Compound MDL 20,610 was also active against human, simian, and bovine rotaviruses (cytopathic effect IC1/2s of 0.8 to 1.5 micrograms/ml) and possessed variable enterovirus and paramyxovirus activity.
mesh_terms: D000998:Antiviral Agents / Q000494:pharmacology*; D004279:DNA, Viral / Q000096:biosynthesis; D006367:HeLa Cells; D006801:Humans; D011725:Pyridines / Q000494:pharmacology*; D012367:RNA, Viral / Q000096:biosynthesis; D010948:Viral Plaque Assay; D014764:Viral Proteins / Q000096:biosynthesis; D014780:Viruses / Q000187:drug effects* / Q000378:metabolism
chemical_list: D000998:Antiviral Agents; D004279:DNA, Viral; D011725:Pyridines; D012367:RNA, Viral; D014764:Viral Proteins; C050726:MDL 20646; C050727:MDL 20957; C050725:MDL 20610