title: Synthesis and vasodilating properties of N-alkylamide derivatives of 4-amino-3-furoxancarboxylic acid and related azo derivatives.
abstract: A series of N-alkylamide derivatives of 4-amino-3-furoxancarboxylic acids 5a-11a and their oxidation products, the azo derivatives 5b-11b, were synthesised and studied for their vasodilating properties. All the products were able to release rat aorta strips precontracted with (-)noradrenaline. Azo derivatives proved to be 20-200 times more potent than the parent amines. The large variation of lipophilicity within the two series does not seem to influence significantly the activity. Experiments carried out in the presence of oxyhaemoglobin (HbO(2)) suggest the involvement of nitric oxide (NO*) in the vasodilation.
mesh_terms: D000818:Animals; D001013:Aorta, Thoracic / Q000187:drug effects / Q000502:physiology; D001391:Azo Compounds / Q000138:chemical synthesis / Q000494:pharmacology*; D066298:In Vitro Techniques; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009131:Muscle, Smooth, Vascular / Q000187:drug effects / Q000502:physiology; D009569:Nitric Oxide / Q000378:metabolism; D010069:Oxadiazoles / Q000138:chemical synthesis / Q000494:pharmacology*; D010108:Oxyhemoglobins / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D013329:Structure-Activity Relationship; D014665:Vasodilator Agents / Q000138:chemical synthesis / Q000494:pharmacology*
chemical_list: D001391:Azo Compounds; D010069:Oxadiazoles; D010108:Oxyhemoglobins; D014665:Vasodilator Agents; C010166:furoxans; D009569:Nitric Oxide