title: beta-Adrenergic blocking action of halonitrophenethanolamines.
abstract: A series of phenethanolamines with N-isopropyl and N-tertbutyl substituents and ring-substituted with nitro- and halogen groups has been prepared. Using guinea-pig isolated atrial and tracheal preparations, the influence of the nitro-group on the beta 1- and beta 2-antagonist actions of the mono-halogen compounds was determined, and the antagonist and partial agonist effects of the halo-nitro-compounds on beta-adrenoceptors in these tissues measured to help elucidate structure-activity relations in this series. The halonitro compounds did not show enhanced activity compared with the mono-halogen substituted analogues. Several of the new compounds showed slight but significant beta 2-antagonist selectivity of action, and one compound was significantly beta 1-selective.
mesh_terms: D015078:2-Hydroxyphenethylamine / Q000031:analogs & derivatives / Q000494:pharmacology*; D000319:Adrenergic beta-Antagonists; D000818:Animals; D055598:Chemical Phenomena; D002621:Chemistry; D006168:Guinea Pigs; D066298:In Vitro Techniques; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects; D009200:Myocardial Contraction / Q000187:drug effects; D010627:Phenethylamines / Q000494:pharmacology*; D011943:Receptors, Adrenergic, beta / Q000187:drug effects; D013329:Structure-Activity Relationship; D014132:Trachea / Q000187:drug effects
chemical_list: D000319:Adrenergic beta-Antagonists; D010627:Phenethylamines; D011943:Receptors, Adrenergic, beta; D015078:2-Hydroxyphenethylamine