In this study for developing potent
analgesic and anti-inflammatory compounds, we synthesized
6-acyl-2-benzoxazolinone and 6-acyl-2-benzothiazolinone derivatives with
acetic acid and
propanoic acid side chain, and performed preliminary screening of their in vivo
analgesic and anti-inflammatory activities at a single dose of 100 mg/kg inmice by a
p-benzoquinone-induced writhing test and a Carrageenaninduced hind paw
edema model, respectively. We also determined their gastric ulceration effects in the tested animals.
Propanoic acid derivatives were generally found to have higher
analgesic and anti-inflammatory activities, and among them, 3-(6-benzoyl-2-benzothiazolinon-3-yl)propanoic
acid (Compound 4 a) exhibited the highest
analgesic and anti-inflammatory activity. However, all compounds showed lower anti-inflammatory effects than we observed for
indomethacin at 10 mg/kg dose. Consequently, 6-acyl-2-benzoxazolinone/2-benzothiazolinones having
propanoic acid side chain might lead to further studies for developing better candidates with potent
analgesic and anti-inflammatory effects while
acetic acid derivatives do not exhibit comparable satisfactory features.