| abstract |
The invention relates to compounds of formula n n n n n n n n n n wherein R 1 , R 2 , R3, R 4 , and Ar are as defined in the specification and claims, or to pharmaceutically active acid addition salts of such compounds. Compounds of formula I are modulators for amyloid beta and may be useful for the treatment or prevention of a disease associated with the deposition of β-amyloid in the brain, in particular Alzheimer's disease, and other diseases such as cerebral amyloid angiopathy, hereditary cerebral hemorrhage with amyloidosis, Dutch-type (HCHWA-D), multi-infarct dementia, dementia pugilistica and Down syndrome. |