The present invention relates to novel 4-pyrazin-2-ylmethyl- morpholines of general formulaA,processes for their preparation, pharmaceutical compositions containing them and their use in therapy, particularly in the treatment or prevention of conditions having an association with NR2B negative allosteric modulating properties.本發明係關於新穎的通式A之4-吡?-2-基甲基-嗎啉,其製備方法、含有其之醫藥組合物,以及其在療法中,尤其在治療或預防與NR2B負向立體異位調節性質相關病況中的用途。