Functionalized heterocycles as antiviral agents

A compound represented by Formula (XIII-1) or Formula (XIII-2), or a pharmaceutically acceptable salt thereof:

• wherein R2 and R3 are selected from the group consisting of halogen, —CN, —CH3, —CF3, —CHF2, —C(O)CH3, —OCH3, —OCF3, —OCHF2, —OH, —OR11, —NH2, NHR12;
• or R2 and R3 are selected from the groups below by removal of a hydrogen atom
• wherein each of these groups is optionally substituted with one to four groups selected from halo, CN, optionally substituted C1-C6 alkyl, and optionally substituted 3- to 8-membered heterocyclic;
• or R2 and R3 are each selected from one of the following:
• wherein each R21 is independently selected from —CH3, —CHF2, —CF3, -isopropyl, -t-butyl, or one of the following by removal of a hydrogen atom:
• wherein each of these groups is optionally substituted with one to four groups selected from halo, CN, optionally substituted C1-C6 alkyl, and optionally substituted 3- to 8-membered heterocyclic;
• R11 and R12 are each independently selected from the following groups by removal of a hydrogen atom:
• and Q4 is optionally substituted —C1-C6 alkyl.