title: N-substituted imidazolines and ethylenediamines and their action on alpha- and beta-adrenergic receptors.
abstract: A series of N-substituted imidazolines and ethylenediamines were synthesized and examined for their activity in alpha- and beta-adrenergic systems. The length of the intermediate side chain between the catechol and imidazoline ring or the amine of the ethylenediamine segment was shown to affect the adrenergic activity. N-[2-(3,4-Dihydroxyphenyl)ethyl]imidazoline hydrochloride (2) and N-[2-(3,4-dihydroxyphenyl)ethyl]ethylenediamine dihydrochloride (4), both with two methylene groups between the catechol and amine segment, were found to be somewhat selective for alpha 2-adrenergic receptors while 1-(3,4-dihydroxybenzyl)imidazoline hydrochloride (1) and N-2-(3,4-dihydroxybenzyl)ethylenediamine dihydrochloride (3), both with one methylene group between the catechol and amine segment, were more selective for alpha1-adrenergic receptors in a pithed rat model. Of the four compounds examined, only compound 2 showed significant direct activity on beta1- and beta2-adrenergic receptors.
authors.forename: A
authors.initials: A
authors.lastname: Hamada
authors.forename: E L
authors.initials: EL
authors.lastname: Yaden
authors.forename: J S
authors.initials: JS
authors.lastname: Horng
authors.forename: R R
authors.initials: RR
authors.lastname: Ruffolo
authors.forename: P N
authors.initials: PN
authors.lastname: Patil
authors.forename: D D
authors.initials: DD
authors.lastname: Miller
mesh_terms: D000818:Animals; D001381:Azepines / Q000494:pharmacology; D001794:Blood Pressure / Q000187:drug effects; D055598:Chemical Phenomena; D002621:Chemistry; D005029:Ethylenediamines / Q000138:chemical synthesis / Q000494:pharmacology*; D006339:Heart Rate / Q000187:drug effects; D007093:Imidazoles / Q000138:chemical synthesis / Q000494:pharmacology*; D008297:Male; D011224:Prazosin / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D011942:Receptors, Adrenergic, alpha / Q000187:drug effects / Q000502:physiology*; D011943:Receptors, Adrenergic, beta / Q000187:drug effects / Q000502:physiology*; D013268:Stimulation, Chemical; D013329:Structure-Activity Relationship; D015016:Yohimbine / Q000494:pharmacology
chemical_list: D001381:Azepines; D005029:Ethylenediamines; D007093:Imidazoles; D011942:Receptors, Adrenergic, alpha; D011943:Receptors, Adrenergic, beta; D015016:Yohimbine; C015603:azepexole; C014282:cirazoline; D011224:Prazosin