title: Synthesis and cloxacillin antimicrobial enhancement of 2-methylsulfonylimidazolyl-1,4-dihydropyridine derivatives.
abstract: OBJECTIVE
  Hospital-acquired methicillin-resistant Staphylococcus aureus (MRSA) has been a major problem worldwide in chemotherapy of infection disease. This study was designed to assess the enhancing effects of a new group of dihydropyridine-3,5dicarboxamides, in combination with cloxacillin with distinctly different mechanisms of action against MRSAs.
  
  
  METHODS
  Dihydropyridine-3,5-dicarboxamides with 2-methylsulfonylimidazole at 4 position 6a-k were synthesized by the reaction of corresponding aldehyde 5 with different N-aryl acetoacetamides 3 in the presence of ammonium hydroxide. Agar disc diffusion method was used to determine the antibacterial and potentiating activity of different synthetic compounds in the presence and absence of cloxacillin to evaluate their activity as modulators of multidrugresistant (MDR).
  
  
  CONCLUSIONS
  The antibacterial effect of cloxacillin was enhanced by compounds 6g and 6h against cloxacillin-resistant strains (MRSA(1) and MRSA(2)). The potentiation was found 1 2 to be statistically significant (p<0.01). Compound 6g at concentration of 1000 µg/disc, caused a 329 percent potentiation of the activity of cloxacillin against MRSA(1).
authors.affiliation: Department of Medicinal Chemistry.
authors.forename: T
authors.initials: T
authors.lastname: Akbarzadeh
authors.forename: A
authors.initials: A
authors.lastname: Fallah Tafti
authors.forename: N
authors.initials: N
authors.lastname: Samadi
authors.forename: A
authors.initials: A
authors.lastname: Foroumadi
authors.forename: M
authors.initials: M
authors.lastname: Amanlou
authors.forename: M A
authors.initials: MA
authors.lastname: Faramarzi
authors.forename: A
authors.initials: A
authors.lastname: Shafiee