Hepatitis B antiviral agents

A compound of Formula V:

• or a pharmaceutically acceptable salt thereof;
• wherein
• R4 is H or C1-C6 alkyl;
• G1 is H or C1-C6 alkyl;
• each R5 is independently selected at each occurrence from the group consisting of OH, C1-C6 alkyl, halo, —CN, —NO2, C1-C6 chloroalkyl, —C1-C6 dichloroalkyl, —C1-C6 trichloroalkyl, —C1-C6 fluoroalkyl, —C1-C6 difluoroalkyl and —C1-C6 trifluoroalkyl;
• R2 is independently selected at each occurrence from the group consisting of halo, —OH, —CN, —NO2, —C1-C6 alkyl, —C1-C6 alkoxy, —C1-C6 fluoroalkyl, —C1-C6 heteroalkyl, and C(O)—C1-C6 alkyl;
• n is 1, 2, 3, 4, 5, or 6;
• x is selected from the group consisting of 0, 1, 2, 3 and 4;
• and
• y is selected from the group consisting of 1, 2, and 3.