Medicines for treatment or prevention of dementia comprising 2-aryl-8-oxodihydropurine derivatives of the formula (I):
1
wherein W is H, C
1-6
alkyl, halogen, C
1-6
alkoxy, or the like; X is H, C
1-6
alkyl, a group of the formula (Q): —CH(R
3
)CON(R
1
) (R
2
) (wherein R
1
is a C
1-6
alkyl or the like; R
2
is phenyl-substituted C
1-4
alkyl or the like; and R
3
is H or the like); Y is H, C
1-6
alkyl, a group of the above formula (Q), or the like; and A is substituted phenyl or the like, with the proviso that one of X and Y is a group of the formula (Q) and the other is a group selected from those defined for X or Y except the groups (Q), or pharmaceutically acceptable acid addition salts thereof. The above compounds exhibit an extremely potent ameliorating effect on learning disorder and/or dymnesia and thus are useful in the treatment or prevention of Alzheimer-type dementia, cerebrovascular dementia, senile dementia, etc.
治疗或预防痴呆症的药物,包括式 (I) 的 2-芳基-8-氧二氢
嘌呤衍
生物:
1
其中 W 为 H、C
1-6
烷基、卤素、C
1-6
烷氧基或类似物;X 是 H、C
1-6
烷基、式 (Q) 的基团:-CH(R
3
) CON(R
1
) (R
2
)(其中 R
1
是一个 C
1-6
烷基或类似物;R
2
是苯基取代的 C
1-4
烷基或类似物;以及 R
3
是 H 或类似物);Y 是 H、C
1-6
烷基、上式(Q)中的基团或类似基团;以及 A 是取代苯基或类似基团,但条件是 X 和 Y 中的一个是式 (Q)中的基团,另一个是从 X 或 Y 所定义的基团(Q)除外的基团中选出的基团,或其药学上可接受的酸加成盐。上述化合物对学习障碍和/或失智症有极强的改善作用,因此可用于治疗或预防阿尔茨海默型痴呆症、脑血管痴呆症、老年痴呆症等。