title: Novel [(biphenyloxy)propyl]isoxazole derivatives for inhibition of human rhinovirus 2 and coxsackievirus B3 replication.
abstract: OBJECTIVE
  During this study, novel biphenyl derivatives were synthesized and tested for antiviral activity.
  
  
  METHODS
  A new method based on the Suzuki coupling reaction has been established for the synthesis of these polysubstituted chain systems. In parallel with cytotoxicity, the antiviral activity of biphenyl derivatives has been determined in cytopathic effect (CPE)-inhibitory assays with the pleconaril-resistant coxsackievirus B3 (CVB3) strain Nancy, human rhinovirus 2 (HRV-2) and 14 (HRV-14) and in plaque reduction assays with the pleconaril-sensitive human isolate CVB3 97-927 in HeLa cells. Based on the results from these investigations the selectivity index (SI) was determined as the ratio of the 50% cytotoxic concentration to the 50% inhibitory concentration.
  
  
  RESULTS
  The new method based on the Suzuki coupling reaction includes the condensation of 2,6-dimethyl-4-bromophenol with pentyne chloride by means of potassium carbonate and potassium iodide in N-methylpyrrolidone-2 and yields 5-bromo-1,3-dimethyl-2-(4-pentynyloxy)benzene. Its condensation with methylacetaldoxime results in 3-methylisoxazole derivatives. The following reaction with different benzeneboronic acids by means of tetrakis(triphenylphosphine)-palladium(0) finally yields the corresponding derivatives. Several of the novel synthesized derivatives demonstrated a good antiviral activity on CVB3 (SI > 2 to > 37.5) and a strong anti-HRV-2 activity (SI > 50 to > 200). In contrast, none of the compounds inhibited the HRV-14-induced CPE.
  
  
  CONCLUSIONS
  These results indicate that [(biphenyloxy)propyl]isoxazole derivatives are potential inhibitors of HRV-2 and CVB3 replication, and make them promising agents for the specific treatment of these virus infections.
authors.affiliation: Department of Medicinal Chemistry, Research Center for Antibiotics, Nagatinskaya Street 3a, Moscow 117105, Russia.
authors.forename: Vadim A
authors.initials: VA
authors.lastname: Makarov
authors.forename: Olga B
authors.initials: OB
authors.lastname: Riabova
authors.forename: Vladimir G
authors.initials: VG
authors.lastname: Granik
authors.forename: Peter
authors.initials: P
authors.lastname: Wutzler
authors.forename: Michaela
authors.initials: M
authors.lastname: Schmidtke
mesh_terms: D000998:Antiviral Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D029822:Enterovirus B, Human / Q000187:drug effects*; D006367:HeLa Cells; D006801:Humans; D007555:Isoxazoles / Q000138:chemical synthesis* / Q000494:pharmacology*; D008956:Models, Chemical; D015394:Molecular Structure; D012229:Rhinovirus / Q000187:drug effects*; D014779:Virus Replication / Q000187:drug effects*
chemical_list: D000998:Antiviral Agents; D007555:Isoxazoles