The present invention relates to compounds of the Formula I wherein R<;SUP>;1<;/SUP>;, R<;SUP>;2<;/SUP>;, R<;SUP>;3<;/SUP>;, R<;SUP>;4<;/SUP>;, R<;SUP>;6<;/SUP>;, R<;SUP>;7 <;/SUP>;and A are as defined. Compounds of the Formula I have activity inhibiting production of Abeta-peptide. The invention also relates to pharmaceutical compositions and methods for treating diseases and disorders, for example, neurodegenerative and/or neurological disorders, e.g., Alzheimer's disease, in a mammal comprising compounds of the Formula I.