Novel pyrazola[3,4-d]pyrimidine derivatives represented by the formula (I)
wherein
Rls an aryl or heteroaryl group which may be substituted;
Ris a lower alkyl group;
R3 and R4 are independently hydrogen or a lower alkyl group;
R5 is hydrogen, a lower alkyl group or a lower acyl group, the group R5 being attached at the 1- or 2- position of the pyrazole ring;
Xis a lower alkylene group which may contain a hetero-atom;
and the dotted line designates the presence of two double bonds in the pyrazole ring and their salts activate cerebral functions and metabolisms.
由式 (I) 代表的新型
吡唑并[3,4-d]
嘧啶衍
生物
其中
Rls 一个芳基或杂芳基,可被取代;
Ris 一个低级烷基;
R3 和 R4 独立地为氢或低级烷基;
R5 是氢、低级烷基或低级酰基,基团 R5 连接在
吡唑环的 1- 或 2- 位上;
X 是低级亚烷基,可含有一个杂原子;
虚线表示
吡唑环上有两个双键,它们的盐类能激活大脑功能和新陈代谢。