The present inventions relate to substituted piperazine derivatives of general formula (I) and to the manufacture of said compounds, pharmaceutical compositions comprising a compound according to general formula (I), and the use of said compounds for the treatment of various medical conditions related to glycine transporter-1 (GlyT1).本發明係關於通式(I)之經取代六氫吡衍生物且係關於該等化合物之製造、包含通式(I)化合物之醫藥組合物以及該等化合物用於治療與甘胺酸轉運體-1(glycine transporter-1;GlyT1)相關之各種醫學病狀之用途。