Structure-activity relationships of 2-arylamido-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxamide derivatives as cannabinoid receptor agonists and their analgesic action.

SAR studies were performed on a series of 2-arylamido-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxamide derivatives as cannabinoid receptor agonists. Starting from a HTS hit both potency and selectivity could be improved. Modifications to the thiophene fusion and C-3 amides were studied. A representative compound 3t produced analgesia when dosed orally in inflammatory pain models of writhing and carrageenan-induced allodynia.