The present invention is directed to compounds of formula (I) which are inhibitors of the beta-secretase enzyme and that are useful in the treatment of diseases in which the beta-secretase enzyme is involved, such as Alzheimers disease. The invention is also directed to pharmaceutical compositions comprising these compounds and the use of these compounds and compositions in the treatment of such diseases in which the beta-secretase enzyme is involved.Linvention concerne des composés de la formule (I) inhibiteurs de lenzyme bêta-secrétase et utiles dans le traitement de maladies dans lesquelles lenzyme bêta-secrétase est impliquée, comme la maladie dAlzheimer. Linvention concerne également des compositions pharmaceutiques comportant ces composés, et lutilisation de ces composés et compositions dans le traitement de maladies dans lesquelles lenzyme bêta-secrétase est impliquée.