title: 7-Aroyl-2,3-dihydrobenzo[b]furan-3-carboxylic acids and 7-benzoyl-2,3-dihydrobenzo[b]thiophene-3-carboxylic acids as analgesic agents.
abstract: The synthesis of a series of 7-aroyl-2,3-dihydrobenzo[b]furan-3-carboxylic acids and 7-benzoyl-2,3-dihydrobenzo[b]thiophene-3-carboxylic acids is described. The isomeric 4-benzoyl-1,3-dihydrobenzo[c]furan-1-carboxylic acid was also prepared. Compounds were evaluated for analgesic activity in the mouse phenyl-p-quinone-induced writhing test. Selected compounds were tested for their ability to produce gastric damage in fasted mice and for inhibition of prostaglandin synthetase activity in vitro. Zomepirac was used as a reference. Structure-activity relationships are discussed. One of the compounds, 7-benzoyl-5-chloro-2,3-dihydrobenzo[b]furan-3-carboxylic acid (2c), combined potent analgesic activity with low gastric irritancy.
mesh_terms: D000700:Analgesics / Q000138:chemical synthesis* / Q000494:pharmacology / Q000633:toxicity; D000818:Animals; D001572:Benzofurans / Q000138:chemical synthesis* / Q000494:pharmacology; D016861:Cyclooxygenase Inhibitors; D005753:Gastric Mucosa / Q000187:drug effects; D008297:Male; D051379:Mice; D013329:Structure-Activity Relationship; D013876:Thiophenes / Q000138:chemical synthesis* / Q000494:pharmacology; D014046:Tolmetin / Q000031:analogs & derivatives / Q000494:pharmacology
chemical_list: D000700:Analgesics; D001572:Benzofurans; D016861:Cyclooxygenase Inhibitors; D013876:Thiophenes; C020549:zomepirac; D014046:Tolmetin