Patent ID: 7169766

Claim:
A method for the treatment of a hepatitis C virus infection in a host, comprising administering an anti-virally effective amount of a β-D nucleoside compound of formula: or a pharmaceutically acceptable salt or ester thereof, wherein: Base is a triazolopyridine, imidazolopyridine, or pyrazolopyrimidine; R 1 is independently H; phosphate; stabilized phosphate prodrug; acyl; alkyl; sulfonate ester; benzyl, wherein the phenyl group is optionally substituted with one or more substituents selected from the group consisting of hydroxyl, amino, alkylamino, arylamino, alkoxy, aryloxy, nitro, cyano, sulfonic acid, sulfate, phosphonic acid, phosphate, and phosphonate; a lipid; an amino acid; a carbohydrate; a peptide; cholesterol; or a pharmaceutically acceptable leaving group which when administered in vivo provides a compound wherein R 1 is independently H or phosphate; R 6 is alkyl, lower alkyl, alkynyl, —C(O)O(alkyl), —C(O)O(lower alkyl), —O(acyl), —O(lower acyl), —O(alkyl), —O(lower alkyl), —O(alkenyl), chloro, bromo, fluoro, iodo, NO 2 , NH 2 , —NH(lower alkyl), —NH(acyl), —N(lower alkyl) 2 , or —N(acyl) 2 ; R 7 and R 9 are independently OR 1 , hydroxy, alkyl, lower alkyl, azido, cyano, alkenyl, alkynyl, Br-vinyl, —C(O)O(alkyl), —C(O)O(lower alkyl), —O(acyl), —O(lower acyl), —O(alkyl), —O(lower alkyl), —O(alkenyl), chlorine, bromine, iodine, NO 2 , NH 2 , —NH(lower alkyl), —NH(acyl), —N(lower alkyl) 2 , or —N(acyl) 2 ; R 10 is H, alkyl, lower alkyl, chlorine, bromine or iodine; and X is O, S, SO 2 or CH 2 .