Viral polymerase inhibitors

A compound of formula (I):

• wherein:
• X is selected from O and S;
• R2 is selected from the group consisting of
• and optionally substituted with 1 to 5 R20 substituents, wherein R20 in each case is independently selected from:
• a) halo, cyano or nitro;
• b) R7, —C(═O)—R7, —C(═O)—O—R7, —O—R7, —S—R7, —SO—R7, —SO2—R7, —(C1-6)alkylene-R7, —(C1-6)alkylene-C(═O)—R7, —(C1-6)alkylene-C(═O)—O—R7, —(C1-6)alkylene-O—R7, —(C1-6)alkylene-S—R7, —(C1-6)alkylene-SO—R7 or —(C1-6)alkylene-SO2—R7;
• wherein R7 is in each instance independently selected from H, (C1-6)alkyl, (C2-6)alkenyl, (C2-6)alkynyl, (C1-6)haloalkyl, (C3-7)cycloalkyl, (C3-7)cycloalkyl-(C1-6)alkyl, aryl and Het;
• wherein the (C1-6)alkyl, (C2-6)alkenyl, (C2-6)alkynyl, (C1-6)haloalkyl, (C3-7)cycloalkyl, (C3-7)cycloalkyl-(C1-6)alkyl, and (C1-6)alkylene are optionally substituted with 1 or 2 substituents each independently selected from —OH, —(C1-6)alkyl (optionally substituted with —O—(C1-6)alkyl), halo, —(C1-6)haloalkyl, (C3-7)cycloalkyl, —O—(C1-6)alkyl, cyano, COOH, —NH2, —NH(C1-4)alkyl, —NH(C3-7)cycloalkyl, —N((C1-4)alkyl)(C3-7)cycloalkyl, —N((C1-4)alkyl)2 aryl, —(C1-6)alkyl-aryl, Het, —(C1-6)alkyl-Het;
• and
• wherein each of the aryl and Het is optionally substituted with 1 to 3 substituents each independently selected from:
• i) halo, cyano, oxo, thioxo, imino, —OH, —O—(C1-6)alkyl, —O—(C1-6)haloalkyl, (C3-7)cycloalkyl, (C1-6)haloalkyl, —C(═O)—(C1-6)alkyl, —SO2(C1-6)alkyl, —C(═O)—NH2, —C(═O)—NH(C1-4)alkyl, —C(═O)—N((C1-4)alkyl)2, —C(═O)—NH(C3-7)cycloalkyl, —C(═O)—N((C1-4)alkyl)(C3-7)cycloalkyl, —NH2, —NH(C1-4)alkyl, —N((C1-4)alkyl)2, —NH(C3-7)cycloalkyl, —N((C1-4)alkyl)(C3-7)cycloalkyl or —NH—C(═O)(C1-4)alkyl;
• ii) (C1-6)alkyl optionally substituted with —OH, —O—(C1-6)haloalkyl, or —O—(C1-6)alkyl;
• and
• iii) aryl or Het, wherein each of the aryl and Het is optionally substituted with halo or (C1-6)alkyl;
• and
• c) —N(R8)R9, —C(═O)—N(R8)R9, —O—C(═O)—N(R8)R9, —SO2—N(R8)R9, —(C1-6)alkylene-N(R8)R9, —(C1-6)alkylene-C(═O)—N(R8)R9, —(C1-6)alkylene-O—C(═O)—N(R8)R9, or —(C1-6)alkylene-SO2—N(R8)R9;
• wherein the (C1-6) alkylene is optionally substituted with 1 or 2 substituents each independently selected from —OH, —(C1-6)alkyl, halo, —(C1-6)haloalkyl, (C3-7)cycloalkyl, —O—(C1-6)alkyl, cyano, COOH, —NH2, —NH(C1-4)alkyl, —NH(C3-7)cycloalkyl, —N((C1-4)alkyl)(C3-7)cycloalkyl and —N((C1-4)alkyl)2;
• R8 is in each instance independently selected from H, (C1-6)alkyl and (C3-7) cycloalkyl;
• and
• R9 is in each instance independently selected from R7, —O— (C1-6)alkyl, —(C1-6)alkylene-R7, —SO2—R7, —C(═O)—R7, —C(═O)OR7 and —C(═O)N(R8)R7;
• wherein R7 and R8 are as defined above;
• or R8 and R9, together with the N to which they are attached, are linked to form a 4- to 7-membered heterocycle optionally further containing 1 to 3 heteroatoms each independently selected from N, O and S, wherein each S heteroatom may, independently and where possible, exist in an oxidized state such that it is further bonded to one or two oxygen atoms to form the groups SO or SO2;
• wherein the heterocycle is optionally substituted with 1 to 3 substituents each independently selected from (C1-6)alkyl, (C1-6)haloalkyl, halo, oxo, —OH, SH, —O(C1-6)alkyl, —S(C1-6)alkyl, (C3-7)cycloalkyl, —NH2, —NH(C1-6)alkyl, —N((C1-6)alkyl)2, —NH(C3-7)cycloalkyl, —N((C1-4)alkyl)(C3-7)cycloalkyl, —C(═O)(C1-6)alkyl and —NHC(═O)—(C1-6)alkyl;
• R3, R3a and R3b are selected from H, halo, CN, (C1-4)alkyl, —OH, —O—(C1-4)alkyl, —S—(C1-4) alkyl, —NH2, —NH(C1-4)alkyl, —NH(C3-7)cycloalkyl, —N((C1-4)alkyl)(C3-7)cycloalkyl) and —N((C1-4)alkyl)2;
• R5 is R51 mono-, di-, or tri-substituted with O—R52,
• wherein R51 is (C1-6)alkyl, (C3-7)cycloalkyl, (C1-6)alkyl-(C3-7)cycloalkyl, aryl, (C1-6)alkyl-aryl, Het or (C1-6)alkyl-Het, each R51 being optionally substituted with (C1-6)alkyl, (C3-7)cycloalkyl or (C1-6)alkyl-(C3-7)cycloalkyl;
• and
• R52 is (C1-6)alkyl, (C3-7)cycloalkyl, (C1-6)alkyl-(C3-7)cycloalkyl, aryl, (C1-6)alkyl-aryl, Het or (C1-6)alkyl-Het, said aryl and Het being optionally substituted with (C1-6)alkyl or O—(C1-6)alkyl;
• R6 is (C3-7)cycloalkyl, (C1-6)alkyl-(C3-7)cycloalkyl, aryl, (C1-6)alkyl-aryl, Het or (C1-6)alkyl-Het;
• being optionally substituted with 1 to 5 substituents each independently selected from halo, (C1-6)alkyl, (C1-6)haloalkyl, (C3-7)cycloalkyl, —OH, —SH, —O—(C1-4)alkyl, —S—(C1-4)alkyl and —N(R8)R9;
• wherein R8 and R9 are as defined above;
• or a pharmaceutically salt thereof.