Abstract: Compounds having the general formula (I): are provided which have enhanced inhibitory potency and are thus useful in methods of prophylaxis or treatment of a viral infection such as hepatitis C virus. The compounds are phosphoramidate derivatives of nucleoside compounds derived from bases such as adenine and guanine. The glycoside moiety of the nucleoside compound can be substituted at the ss-2? position with methyl and the phosphoramidate group can be 1-naphthyl linked by —O— to the P atom. These compounds can be administered as pharmaceutical compositions, and methods for their preparation are also provided.

Abstract: Phosphoramidate derivatives of nucleoside compounds of formula I derived from bases such as adenine and guanine have enhanced therapeutic potency, in particular, enhanced potency with respect to the prophylaxis or treatment of a viral infection such as hepatitis C virus. The glycoside moiety of the nucleoside compound is suitably substituted at the ?-2? position with methyl and the phosphoramidate group, suitably comprises 1-naphthyl linked by —O— to the P atom.