4,5-ring annulated indole derivatives for treating or preventing of HCV and related viral infections

A compound having the formula:

• or a pharmaceutically acceptable salt or ester thereof, wherein the dotted line indicates an optional and additional bond, and wherein:
• R2 is —C(O)OR9 or —C(O)NHSO2R11;
• R6 and R7 are each independently selected from H, alkyl, F, Cl, —CF3, —OH, —O-alkyl, —OCF3, —NH2 and —NHSO2-alkyl;
• each occurrence of R8 is independently H, alkyl, alkenyl, alkynyl, —[C(R12)2]q-aryl, —[C(R12)2]q-cycloalkyl, —[C(R12)2]q-cycloalkenyl, —[C(R12)2]q-heterocycloalkyl, —[C(R12)2]q-heterocycloalkenyl, —[C(R12)2]q-heteroaryl, haloalkyl or hydroxyalkyl;
• each occurrence of R11 is independently alkyl, aryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, heteroaryl, haloalkyl, hydroxy or hydroxyalkyl, wherein a cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl or heteroaryl group can be optionally substituted with up to 4 substituents, which are each independently selected from —H, alkyl, alkenyl, alkynyl, aryl, —[C(R12)2]q-cycloalkyl, —[C(R12)2]q-cycloalkenyl, —[C(R12)2]q-heterocycloalkyl, —[C(R12)2]q-heterocycloalkenyl, —[C(R12)2]q-heteroaryl, —[C(R12)2]q-haloalkyl, —[C(R12)2]q-hydroxyalkyl, halo, —OH, —OR9, —CN, —[C(R12)2]q—C(O)R8, —[C(R12)2]q—C(O)OR9, —[C(R12)2]q—C(O)N(R9)2, —[C(R12)2]q—OR9, —[C(R12)2]q—N(R9)2, —[C(R12)2]q—NHC(O)R8, —[C(R12)2]q—NR8C(O)N(R9)2, —[C(R12)2]q—NHSO2alkyl, —[C(R12)2]q—NHSO2cycloalkyl, —[C(R12)2]q—NHSO2aryl, —[C(R12)2]q—SO2N(R9)2 and —SO2N(R9)C(O)N(R9)2;
• R9 is H or alkyl;
• and
• R10 is:
• each occurrence of R12 is independently H, halo, —N(R9)2, —OR9, alkyl, cycloalkyl, cycloalkenyl, heterocycloalkyl or heterocycloalkenyl, wherein a cycloalkyl, cycloalkenyl, heterocycloalkyl or heterocycloalkenyl group can be optionally substituted with up to 4 substituents, which are each independently selected from alkyl, halo, haloalkyl, hydroxyalkyl, —OH, —CN, —C(O)alkyl, —C(O)Oalkyl, —C(O)NHalkyl, —C(O)N(alkyl)2, —O-alkyl, —NH2, —NH(alkyl), —N(alkyl)2, —NHC(O)alkyl, —NHSO2alkyl, —SO2alkyl or —SO2NH-alkyl, or two R12 groups, together with the carbon atoms to which they are attached, join to form a cycloalkyl, heterocycloalkyl or C═O group.