title: Synthesis and benzodiazepine receptor affinity of derivatives of the new tricyclic heteroaromatic system pyrido[3',2':5,6]thiopyrano[4,3-c]pyridazin-3(2H,5H)-one.
abstract: Derivatives 7-13 of a new tricyclic heteroaromatic system, pyrido[3',2':5,6]thiopyrano[4,3-c]pyridazin-3(2H,5H)-one, were prepared as potential ligands at the benzodiazepine receptor, in view of their structural analogy with potent ligands such as the pyrazoloquinolines of the CGS series II, and especially with the benzothiopyrano[4,3-c]pyridazinones VI. They were obtained starting from the versatile ketones 2,3-dihydrothiopyrano[2,3-b]pyridin-4(4H)-one 1 and the corresponding 7-methyl derivative 2, via condensation with glyoxylic acid, and reaction of the intermediate acid mixtures with hydrazine or substituted phenylhydrazines. When evaluated for their binding affinity at the benzo diazepine receptor in bovine cortical membranes, the target compounds 8-13 displayed an affinity in the micromolar/submicromolar order. A hypothesis is presented to rationalize these results.
authors.affiliation: Dipartimento di Scienze Farmaceutiche, Università di Pisa, Pisa, Italy. primofiore@farm.unipi.it
authors.forename: Giampaolo
authors.initials: G
authors.lastname: Primofiore
authors.forename: Federico
authors.initials: F
authors.lastname: Da Settimo
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Marini
authors.forename: Francesca
authors.initials: F
authors.lastname: Simorini
authors.forename: Concettina
authors.initials: C
authors.lastname: La Motta
authors.forename: Sabrina
authors.initials: S
authors.lastname: Taliani
authors.forename: Sonia
authors.initials: S
authors.lastname: Laneri
authors.forename: Letizia
authors.initials: L
authors.lastname: Trincavelli
authors.forename: Claudia
authors.initials: C
authors.lastname: Martini
mesh_terms: D000818:Animals; D002417:Cattle; D008024:Ligands; D011724:Pyridazines / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism; D011963:Receptors, GABA-A / Q000378:metabolism*; D013329:Structure-Activity Relationship
chemical_list: D008024:Ligands; D011724:Pyridazines; D011963:Receptors, GABA-A