For reducing gastrointestinal toxicity associated with non-steroidal anti-inflammatory
drugs (NSAIDs) a variety of 6-phenyl/(4-methylphenyl)-3(2H)-pyridazi-non-2-propionamide
were synthesized. The structures of these new pyridazinone derivatives were confirmed
by their IR, 1H-NMR spectra and elementary analysis. All the new compounds were tested in vivo for their analgesic and anti-inflammatory activities. The analgesic activity of the
test compounds was determined by phenylbenzoquinone-induced writhing assay and the
anti-inflammatory activity was evaluated by the carrageenan-induced rat paw edema
model. 6-Phenyl-3(2H)-pyridazinon-2-yl-[4-(4-fluorophe-nyljpiperazinyl] propanamide
IV a-3 was the most active one among the synthesized compounds. Also this compound
exhibited most potent anti-inflammatory activity. Acetylsalicylic acid and Indometacin
were used as reference drugs. Adverse effects of the compounds were examined on gastric
mucosa. None of the compounds showed gastric ulcerogenic effect compared with the
reference NSAIDs.
Key words
Arylpiperazines - 3(2H)-Pyridazinone amides, analgesic activity, anti-inflammatory
activity