1-Bromo derivatives XIIa and XIIb were prepared by bromination of 8-chloro-6-phenyl-4H-s-triazolo[4,3-a]-1,4-benzodiazepine (XIa) and its 6-(2-chlorophenyl) analogue XIb with bromine in chloroform in the presence of pyridine. Substitution reactions with 1-(2-methoxyethyl)piperazine (XIVb), 1-(3-methoxypropyl)piperazine (XVb), 1-(2-ethoxyethyl)piperazine (XVIb) and 1-(2-methylthioethyl)piperazine (XVIIb) afforded the title compound IIb and analogues IIa and IIIb-Vb. A substitution reaction of the bromo derivative XIIb with piperazine gave the 1-piperazino derivative VIIIb which was alkylated with 2-phenoxyethyl bromide and 2-phenylthioethyl bromide to give compounds VIb and VIIb. The title compound IIb has very high anticonvulsant and discoordinating activities in mice. The enlargement of the substituent R1 (compounds IIIb-VIIb) results in a gradual decrease of the effects mentioned.
1-溴衍生物XIIa和XIIb是通过在氯仿中存在吡啶的情况下,用溴对8-氯-6-苯基-4H-s-三唑并[4,3-a]-1,4-苯二氮杂环己烷(XIa)及其6-(2-氯苯基)类似物XIb进行溴化制备的。用1-(2-甲氧基乙基)哌嗪(XIVb)、1-(3-甲氧基丙基)哌嗪(XVb)、1-(2-乙氧基乙基)哌嗪(XVIb)和1-(2-甲硫基乙基)哌嗪(XVIIb)进行取代反应,得到了标题化合物IIb及其类似物IIa和IIIb-Vb。溴衍生物XIIb与哌嗪的取代反应得到了1-哌嗪基衍生物VIIIb,它与2-苯氧基乙溴和2-苯硫基乙溴烷基化,得到化合物VIb和VIIb。标题化合物IIb在小鼠中具有非常高的抗惊厥和失调活性。取代基R1的扩大(化合物IIIb-VIIb)导致上述效应逐渐减弱。