Disclosed herein are nucleoside phosphoramidates and their use as agents for treating viral diseases. These compounds are inhibitors of RNA-dependent RNA viral replication and are useful as inhibitors of HCV NS5B polymerase, as inhibitors of HCV replication and for treatment of hepatitis C infection in mammals.本文中公開核苷氨基磷酸酯和它們作為用於治療病毒疾病的藥劑的用途。這些化合物為RNA-依賴性RNA病毒複製的抑制劑,並且可用作HCV NS5B聚合酶的抑制劑、HCV複製的抑制劑和用於治療哺乳動物中的C型肝炎感染。