| 摘要 |
The invention relates to compounds of formula (I) R1 is -C(O)O-lower alkyl, cyano or is hetaryl; hetaryl is a five-or six membered heteraryl group, optionally substituted by R'; R' is halogen, lower alkyl, lower alkyl substituted by halogen, lower alkoxy or lower alkoxy substituted by halogen; R2 is hydrogen, lower alkoxy, lower alkyl, halogen or cyano; R3 is -(CH2)n-C(O)O-lower alkyl, lower alkyl, lower alkoxy, hydroxy, -O-Si(CH3)2-lower alkyl, -C(O)-N(lower alkyl)2, -O-S(O)2-lower alkyl, C3-7-cycloalkyl, S(O)2-aryl, heterocyclyl, -C(O)-heterocyclyl, or is aryl or hetaryl, which aryl or hetaryl rings are optionally substituted by one or more R'; R4 is hydrogen, lower alkyl, hydroxy or CH2CN; X is S or -N=C(R5)-; R5 is hydrogen, lower alkyl or hydroxy, is a bond, -O-, -CH2-, -CH2-CH2-, formula (II) or or -N(R)-; R is hydrogen, lower alkyl, C(O)O-lower alkyl, C(O)-lower alkyl, S(O)2-lower alkyl, or benzyl; n is 0 or 1 or to pharmaceutically active acid addition salts. The compounds may be used for the treatment of Alzheimer's disease, cerebral amyloid angiopathy, hereditary cerebral hemorrhage with amyloidosis, Dutch-type (HCHWA-D), multi-infarct dementia, dementia pugilistica or Down syndrome.
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