Novel pyrazine derivatives have the formula (1) in which:
wherein R is a hydrogen atom or a lower alkyl group;
Rl is a lower alkoxy group, a lower alkyl group or a hydroxy group;
R³ is a lower alkyl group, a phenyl group, a phenyl- lower alkyl group, a lower alkenyl group or an indolyl-lower alkyl group;
R² is a phenyl-lower alkyl group which may have, on the phenyl ring, l to 3 substituents selected from the group consisting of a lower alkoxy group, a phenyl-lower alkoxy group, a lower alkyl group and a hydroxy group; a group of the formula
wherein R⁴ and R ⁵ have the meanings given in the description. Processes for preparing the pyrazine derivatives are also described. These compounds can be used in pharmaceutical compositions for inhibiting the activities of superoxide radical (O₂⁻) and for preventing and treating nephritis.
新型
吡嗪衍
生物具有式(1),其中
其中 R 是氢原子或低级烷基;
Rl 是低级烷氧基、低级烷基或羟基;
R³ 是低级烷基、苯基、苯基-低级烷基、低级烯基或
吲哚基-低级烷基;
R²是苯基低级烷基,在苯基环上可有 l 至 3 个取代基,这些取代基可从低级烷氧基、苯基低级烷氧基、低级烷基和羟基组成的组中选出; 式中的一个基团
其中 R⁴和 R ⁵ 具有说明中给出的含义。此外,还介绍了
吡嗪衍
生物的制备工艺。这些化合物可用于药物组合物中,以抑制超氧自由基(O₂-)的活性,预防和治疗肾炎。