The present invention relates to novel Tetrahydroimidazo[1,5-a]Pyrazine Derivatives of formula (I), methods for their preparation, pharmaceutical compositions containing the same and their use as a therapeutic agent, especially as a dipeptidyl peptidase IV inhibitor. The definition of substituents in formula (I) are the same as the description.本發明涉及一種通式(I)所示的四氫咪唑並[1,5-a]吡類衍生物、其製備方法以及含有該衍生物的醫藥組合物、以及其作為治療劑的用途,特別是作為二肽基肽酶IV抑制劑的用途,其中通式(I)中的各取代基的定義與說明書中的定義相同。
