The present invention is directed to compounds which are inhibitors of the
dipeptidyl peptidase-IV enzyme ("DP-IV inhibitors") and which are useful
in the treatment or prevention of diseases in which the dipeptidyl
peptidase-IV enzyme is involved, such as diabetes and particularly type 2
diabetes. The invention is also directed to pharmaceutical compositions
comprising these compounds and the use of these compounds and
compositions in the prevention or treatment of such diseases in which the
dipeptidyl peptidase-IV enzyme is involved.