Synthesis and structure-activity analysis of 2-(4-chlorophenyl)-5,6-dihydrothieno[2′,3′:2,3]thiepino[4,5-c]pyridazin-3(2H)-ones as ligands for benzodiazepine receptors
作者:H Tanaka、S Kirihara、H Yasumatsu、T Yakushiji、T Nakao
DOI:10.1016/0223-5234(96)88305-x
日期:1995.1
A series of 2-(4-chlorophenyl)-5,6-dihydrothieno[2',3':2,3]thiepino[4,5-c]pyridazin-3(2H)-ones were synthesized and evaluated in vitro for their affinity tow-ard benzodiazepine receptors (BZRs) in rats and for their intrinsic efficacy in the augmentation of the gamma-aminobutyric acid (GABA)-induced chloride currents in the dissociated frog sensory neurons. Compounds in which the 9-position of the condensed-ring system was substituted with alkyl group or bromine had a high affinity toward BZRs. The substituents at the same position also influenced significantly the GABA-induced chloride currents. As the result, 9-alkyl and 9-bromo substituents would interact with the lipophilic area of BZRs. A series of 2-(4-chlorophenyl)-5,6-dihydrothieno[2',3':2,3]thiepino[4,5-c]pyridazin-3(2H)-ones exhibited partial and full agonistic activities toward BZRs.