| 摘要 |
Medicines for treatment or prevention of dementia comprising 2-aryl-8-oxodihydropurine derivatives of the formula (I): wherein W is H, C1-6 alkyl, halogen, C1-6 alkoxy, or the like; X is H, C1-6 alkyl, a group of the formula (Q): -CH(R3)CON(R1) (R2) (wherein R1 is a C1-6 alkyl or the like; R2 is phenyl-substituted C1-4 alkyl or the like; and R3 is H or the like); Y is H, C1-6 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.
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