title: 1-(alkylamino)isochromans: hypotensives with peripheral and central activities.
abstract: A series of 1-[1-(3,4-dimethoxy-1H-2-benzopyran-1-yl)alkyl]-4-arylpiperazines that shows hypotensive activity in the conscious rat has been investigated. Structure-activity relationships are described. A typical example that was investigated in greater detail is 1-[2-(3,4-dihydro-6,7-dimethoxy-1H-2-benzopyran-1-yl)ethyl]-4-(4-fluorophenyl)piperazine. This compound decreases sympathetic nerve activity recorded from the external carotid and splanchnic nerves of baroreceptor-denervated cats and, therefore, has a central component to its mechanism of action. It also blocks pressor effects of norepinephrine and phenylephrine and is thus an alpha-adrenergic antagonist. Binding data characterize this as alpha 1-adrenergic receptor blockade.
mesh_terms: D000317:Adrenergic alpha-Antagonists / Q000494:pharmacology; D000818:Animals; D000959:Antihypertensive Agents / Q000138:chemical synthesis / Q000494:pharmacology*; D001578:Benzopyrans / Q000494:pharmacology*; D001794:Blood Pressure / Q000187:drug effects; D001921:Brain / Q000187:drug effects; D002415:Cats; D002839:Chromans / Q000138:chemical synthesis / Q000494:pharmacology*; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D011942:Receptors, Adrenergic, alpha / Q000378:metabolism; D013329:Structure-Activity Relationship; D013564:Sympathetic Nervous System / Q000187:drug effects
chemical_list: D000317:Adrenergic alpha-Antagonists; D000959:Antihypertensive Agents; D001578:Benzopyrans; D002839:Chromans; D011942:Receptors, Adrenergic, alpha