title: Synthesis and calcium antagonist activity of new 1,4-dihydropyridines containing nitrobenzylimidazolyl substituent in guinea-pig ileal smooth muscle.
abstract: New alkyl ester analogues of nifedipine, in which the ortho-nitrophenyl group of position 4 is replaced by 1-(4-nitrobenzyl)-5-imidazolyl or 2-methylthio-1-(4-nitrobenzyl)-5-imidazolyl substituent, were synthesized and evaluated as calcium-channel antagonists using the electrically induced contraction of guinea-pig ileal longitudinal smooth muscle. Our results demonstrate that all compounds inhibited the contractile response of guinea-pig ileum to electrical stimulation and the IC50 value of the most potent compounds 6a and 6f were significantly lower than that of nifedipine. Therefore, they are more potent than nifedipine.
authors.affiliation: Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Shaheed Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: A
authors.initials: A
authors.lastname: Zarghi
authors.forename: K
authors.initials: K
authors.lastname: Derakhshandeh
authors.forename: F
authors.initials: F
authors.lastname: Roshanzamir
authors.forename: M
authors.initials: M
authors.lastname: Jorjani
authors.forename: H
authors.initials: H
authors.lastname: Rastegar
authors.forename: M
authors.initials: M
authors.lastname: Varmazyari
authors.forename: A
authors.initials: A
authors.lastname: Shafiee
mesh_terms: D000818:Animals; D002121:Calcium Channel Blockers / Q000138:chemical synthesis* / Q000494:pharmacology*; D004095:Dihydropyridines / Q000138:chemical synthesis* / Q000494:pharmacology*; D004558:Electric Stimulation; D006168:Guinea Pigs; D007082:Ileum / Q000187:drug effects; D007093:Imidazoles / Q000138:chemical synthesis* / Q000494:pharmacology*; D066298:In Vitro Techniques; D007202:Indicators and Reagents; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects; D009130:Muscle, Smooth / Q000187:drug effects*
chemical_list: D002121:Calcium Channel Blockers; D004095:Dihydropyridines; D007093:Imidazoles; D007202:Indicators and Reagents