| abstract |
The invention provides compounds of Formula I: or pharmaceutically acceptable salts thereof, wherein R1, R2 and rings A, B and C are as defined herein. The compounds of Formula I are useful in the treatment or prevention of cognitive disorders, such as Alzheimer's disease. The invention also encompasses pharmaceutical compositions comprising compounds or salts of Formula I, methods for preparing the desired compounds and methods for treating cognitive disorders, such as Alzheimer's disease, using the compounds or salts of Formula I. |