title: New octahydroquinazoline derivatives: synthesis and hypotensive activity.
abstract: Several novel 1-(4-chlorophenyl)-7,7-dimethyl-1,2,3,4,5,6,7,8-octahydro-5-oxo-3-(substitutedphenyl)quinazoline derivatives (2-21) structurally similar to prazosin, were prepared using Mannich reaction of 3-(4-chlorophenylamino)-5,5-dimethyl-2-cyclohexenone (1) with different aromatic amines in the presence of formaline. The structures of the quinazoline derivatives were established using elemental and spectral analyses. Compounds 18, 20 and 21 were found to possess a high hypotensive effect through their expected α(1)-blocking activity like the clinically used drug prazosin but with advantageous of being did not cause reflex tachycardia and having prolonged duration of action when tested in adrenaline-induced hypertension in anaesthetized rats.
authors.affiliation: Department of Medicinal Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt. osamaelsabbagh@yahoo.com
authors.forename: O I
authors.initials: OI
authors.lastname: el-Sabbagh
authors.forename: Mohamed A
authors.initials: MA
authors.lastname: Shabaan
authors.forename: Hanan H
authors.initials: HH
authors.lastname: Kadry
authors.forename: Ehab Saad
authors.initials: ES
authors.lastname: Al-Din
mesh_terms: D000818:Animals; D000959:Antihypertensive Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D013058:Mass Spectrometry; D015394:Molecular Structure; D011799:Quinazolines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D051381:Rats; D013055:Spectrophotometry, Infrared
chemical_list: D000959:Antihypertensive Agents; D011799:Quinazolines