Some 6-arylthio( aryloxy and alkylthio )-3-( acetamidomethyl , benzamidomethyl, methoxy and unsubstituted )-2-arylimidazo[1,2-b] pyridazines have been prepared and examined for their ability to displace [3H]diazepam from rat brain membranes. The most active compound was 3-acetamidomethyl-2-(3',4'-methylenedioxyphenyl)-6-phenylthioimidazo[1,2-b] pyridazine with IC50 4.4 nM. The 3-acylaminomethyl-6-(2- and 3-methoxyphenylthio)-2-phenylimidazo[1,2-b] pyridazines proved less active than their 6-phenylthio analogues, and larger substituents at the 2- and 6-positions markedly decreased binding. Significant differences in binding ability have been observed between 3-acylaminomethyl-2-aryl-6-phenylthioimidazo[1,2-b] pyridazines and the corresponding imidazo [1,2-a]pyridines.
已准备并检查了一些6-芳基硫(芳氧基和烷基硫)-3-(乙酰胺甲基,苯甲酰胺甲基,甲氧基和未取代)-2-芳基咪唑并[1,2-b]吡啶并[1,2-b]吡啶,以评估它们从大鼠脑膜中置换[3H]地西泮的能力。最活跃的化合物是3-乙酰胺甲基-2-(3',4'-亚甲氧基苯基)-6-苯基硫代咪唑并[1,2-b]吡啶,IC50为4.4纳摩尔。3-酰胺基甲基-6-(2-和3-甲氧基苯硫基)-2-苯基咪唑并[1,2-b]吡啶比它们的6-苯基硫类似物活性较低,2-和6-位置的较大取代基显著降低了结合能力。在3-酰胺基甲基-2-芳基-6-苯基硫代咪唑并[1,2-b]吡啶和相应的咪唑并[1,2-a]吡啶之间观察到了显著的结合能力差异。