| 摘要 |
A compound of the formula:wherein Ar is an aromatic ring assembly group which may be substituted or a fused aromatic group which may be substituted; X is (i) a bond, (ii) -S-, -SO- or -SO2-, (iii) C1-6 alkylene, C2-6 alkenylene or C2-6 alkynylene, etc., (iv) -CO-O- or (v) -(CH2)p-X1-, -(CH2)p-X1- (CH2)q-, -(CH2)r-CO-X1-, -SO2-NR8- or -(CH2)r-SO2-NR8- wherein X1 is O or NR8, R8 is H, a hydrocarbon group which may be substituted or an acyl, p is 0 to 5, q is 1 to 5, p+q is 1 to 5, and r is 1 to 4; Y is a divalent C1-6 aliphatic hydrocarbon group optionally containing O or S, which may be substituted; R1 and R2 each is H or a lower alkyl which may be substituted, or R1 and R2 form a N-containing heterocyclic ring which may be substituted; Ring A is a benzene ring which may be further substituted; and Ring B is a 4- to 8-membered ring which may be further substituted, or a salt thereof has the effect of inhibiting amyloid-beta protein production and/or secretion and is useful as a pharmaceutical composition for preventing and/or treating the neurodegenerative disease, etc.
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