Synthesis and preliminary evaluation of new 5-pyrazolinone derivatives as analgesic agents


Gursoy A., Demirayak S., Capan G., Erol K., Vural K.

EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY, vol.35, no.3, pp.359-364, 2000 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 35 Issue: 3
  • Publication Date: 2000
  • Doi Number: 10.1016/s0223-5234(00)00117-3
  • Title of Journal : EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
  • Page Numbers: pp.359-364

Abstract

New 4-(aroyloxyalkanoyl)-2,3-dimethyl-1-phenyl-3-pyrazolin-5-ones (5) were cyclized to 4-(2-aryl-5-unsubstituted/substituted oxazol-4-yl)-2,3-dimethyl-1-phenyl-3-pyrazolin-5-ones (6) employing the Davidson procedure. Preliminary evaluation of analgesic activity revealed that the effect of 4-(2-phenyl-5-ethyloxazol-4-yl)-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one and 4-[2-(4-chlorophenyl)-5-ethyloxazol-4-yl]-2,3-dimethyl-1-phenyl-3-pyrazoline-5-one on acetic acid induced writhing was superior to that of antypyrine and aminopyrine. 4-[2-(4-Chlorophenyl)-5-methyloxazol-4-yl]-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one and 4-[2-(4-methoxyphenyl)-5-ethyloxazol-4-yl]-2,3- dimethyl-1-phenyl-3-pyrazolin-5-one were more potent than aminopyrine, whereas 4-(2-phenyl-5-methyloxazol-4-yl)-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one and 4-[2-(4-methoxyphenyl)-5-methyl-oxazol-4-yl]-2,3-dimethyl-1-phenyl-3-pyrazolin-5-one were not as active (modified Koster's Test; 0.19-0.21 mmol.kg(-1)). None of the selected entries showed inhibition of formaldehyde-induced paw oedema. (C) 2000 Editions scientifiques et medicales Elsevier SAS.