Non-carboxylic antiinflammatory compounds. III. N-(4,6-Dimethylpyridin-2-yl)arylcarboxamides and arylthiocarboxamides acting as brain edema inhibitors

Summary Pharmacomodulation of the non-carboxylic NSAID N -(4,6-dimethylpyridin-2-yl)benzamide 1 led to the synthesis of structurally related furan, thiophene and pyrrole carboxamides 3–14 . The derivatives benzenethiocarboxamides 15–18 and heteroaryl-thiocarboxamides 19–22 were also prepared by oxygen/sulfur exchange; this reaction was more efficiently carried out by P 4 S 10 than by Lawesson's reagent. The 20 synthesized compounds were evaluated against peripheral edema by a foot-pad carrageenin-induced edema test. Amides 3–5, 8, 9, 11, 12 and 14 were most active, exhibiting > 90% inhibition after oral administration of 0.8 mmol·kg −1 . Two amides, 3 and 5 , were selected for evaluation of their inhibitory activity in PLA 2 -induced brain edema and were found to be more potent than dexamethasone after IP administration.