title: Tricyclic heteroaromatic systems: [1]benzopyrano-pyrazol-4-ones as benzodiazepine receptor ligands.
abstract: The synthesis of a series of 8-substituted 1,4-dihydro-1-aryl-3-methyl-[1]benzopyrano[3,4-d]pyrazol-4-ones (series 7) 2,4-dihydro-2-aryl-3-methyl[1]benzopyrano[4,3-c]pyrazol-4-ones (series 8) is reported. Compounds of series 7 and 8 were tested for their ability to displace [3H]flunitrazepam from bovine brain membranes and for their in vitro biological activity. The results allowed some conclusions to be drawn about the structural requirements of the benzodiazepine recognition site within this class of unusual ligands.
authors.affiliation: Dipartimento di Scienze Farmaceutiche, Universita di Firenze.
authors.forename: V
authors.initials: V
authors.lastname: Colotta
authors.forename: L
authors.initials: L
authors.lastname: Cecchi
authors.forename: F
authors.initials: F
authors.lastname: Melani
authors.forename: G
authors.initials: G
authors.lastname: Filacchioni
authors.forename: C
authors.initials: C
authors.lastname: Martini
authors.forename: S
authors.initials: S
authors.lastname: Gelli
authors.forename: A
authors.initials: A
authors.lastname: Lucacchini
mesh_terms: D000818:Animals; D001578:Benzopyrans / Q000138:chemical synthesis* / Q000494:pharmacology; D001667:Binding, Competitive / Q000187:drug effects; D002417:Cattle; D005445:Flunitrazepam / Q000378:metabolism; D006571:Heterocyclic Compounds / Q000138:chemical synthesis / Q000494:pharmacology*; D066298:In Vitro Techniques; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D011720:Pyrazoles / Q000138:chemical synthesis* / Q000494:pharmacology; D011963:Receptors, GABA-A / Q000187:drug effects*; D013329:Structure-Activity Relationship; D005680:gamma-Aminobutyric Acid / Q000378:metabolism
chemical_list: D001578:Benzopyrans; D006571:Heterocyclic Compounds; D011720:Pyrazoles; D011963:Receptors, GABA-A; D005680:gamma-Aminobutyric Acid; D005445:Flunitrazepam