Antiviral compounds

1. A compound of Formula (I), or a pharmaceutically acceptable salt thereof, having the structure:

A-L-Y  (I)

wherein: L is Formula (Ib1):

wherein the dashed semi-circle along with the two carbon atoms to which it is connected form an optionally substituted cycloalkenyl, an optionally substituted aryl, an optionally substituted heteroaryl or an optionally substituted heterocyclyl;

R 4b3 is selected from the group consisting of hydrogen, halogen, hydroxy, an optionally substituted C 1-8 alkyl, an optionally substituted C 2-8 alkenyl, an optionally substituted C 2-8 alkynyl, an optionally substituted C 3-6 cycloalkyl, an optionally substituted aryl, an optionally substituted heteroaryl, an optionally substituted heterocyclyl, an optionally substituted hydroxyalkyl, an optionally substituted C 1-8 alkoxy, an optionally substituted alkoxyalkyl, amino, mono-substituted amino, di-substituted amino, halo(C 1-8 alkyl), haloalkyl and an optionally substituted C-carboxy;

A is selected from the group consisting of an optionally substituted cycloalkyl, an optionally substituted cycloalkenyl, an optionally substituted aryl, an optionally substituted aryl(C 1-2 alkyl), an optionally substituted heteroaryl and an optionally substituted heterocyclyl;

Y is selected from the group consisting of an optionally substituted cycloalkyl, an optionally substituted cycloalkenyl, an optionally substituted aryl, an optionally substituted heteroaryl and an optionally substituted heterocyclyl;

R 1b is hydrogen or an unsubstituted C 1-4 alkyl; and

R 2b and R 2b1 are each independently selected from the group consisting of hydrogen, an optionally substituted C 1-4 alkyl, an optionally substituted aryl(C 1-6 alkyl), an optionally substituted heterocyclyl(C 1-6 alkyl), an alkoxyalkyl, an aminoalkyl, a hydroxyalkyl and hydroxy; or

R 2b1 is hydrogen, and R 1b and R 2b are joined together with the atoms to which they are attached to form an optionally substituted 5 membered heterocyclyl or an optionally substituted 6 membered heterocyclyl.

2. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein

is an optionally substituted

an optionally substituted

or an optionally substituted

wherein each ----- is independently absent or a bond; each R B1 , each R B2 and each R B3 is independently an unsubstituted C 1-6 alkyl, halogen, hydroxy, amino, mono-substituted amino, di-substituted amino or —NH—S(═O)C 1-4 alkyl; and R B4 is hydrogen or an unsubstituted C 1-6 alkyl.

3. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein R 1b is hydrogen.

4. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein R 1b is unsubstituted C 1-4 alkyl.

5. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein R 2b and R 2b1 are both hydrogen.

6. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein A is an optionally substituted aryl.

7. The compound of claim 6 , or a pharmaceutically acceptable salt thereof, wherein A is an optionally substituted phenyl.

8. The compound of claim 7 , or a pharmaceutically acceptable salt thereof, wherein A is a phenyl substituted with one or more substituents selected from the group consisting of: an unsubstituted C 1-4 alkyl, a substituted C 1-4 alkyl, cycloalkyl, hydroxy, an unsubstituted C 1-4 alkoxy, a substituted C 1-4 alkoxy, halogen, haloalkyl, an optionally substituted haloalkoxy, nitro, amino, mono-substituted amino, di-substituted amine, —O-amido, sulfenyl, alkyoxyalkyl, an optionally substituted aryl, an optionally substituted mono-cyclic heteroaryl, an optionally substituted mono-cyclic heterocyclyl, an optionally substituted aryl(C 1-4 alkyl), an optionally substituted monocyclic heteroaryl(C 1-4 alkyl), an optionally substituted monocyclic heterocyclyl(C 1-4 alkyl), hydroxyalkyl and aminoalkyl.

9. The compound of claim 7 , or a pharmaceutically acceptable salt thereof, wherein A is a phenyl substituted with one or more substituents selected from the group consisting of: methyl, ethyl, propyl, butyl, hydroxy, methoxy, ethoxy, n-propoxy, iso-propoxy, n-butoxy, iso-butoxy, t-butoxy, phenoxy, bromo, chloro, fluoro, trifluoromethyl, difluoromethoxy, trifluoromethoxy, cyano, N,N-di-methyl-amine, N,N-di-ethyl-amine, N-methyl-N-ethyl-amine, N-methyl-amino, N-ethyl-amino, amino, N-amido, N-sulfonamido, alkylthio, an optionally substituted phenyl, an optionally substituted imidazole, an optionally substituted morpholinyl, an optionally substituted pyrazole, an optionally substituted pyrrolidinyl, an optionally substituted pyridinyl, an optionally substituted piperidinyl, an optionally substituted piperidinone, an optionally substituted pyrrolidinone, an optionally substituted pyrimidine, an optionally substituted pyrazine, an optionally substituted 1,2,4-oxadiazole, —(CH 2 ) 1-4 —OH, —(CH 2 ) 1-2 —NH(CH 3 ), an optionally substituted —(CH 2 ) 1-2 -imidazole, an optionally substituted —(CH 2 ) 1-2 -pyrrolidinone, an optionally substituted —(CH 2 ) 1-2 -imidazolidinone, —O(CH 2 ) 2 —NH 2 , —O(CH 2 ) 2 —NH(CH 3 ), —O(CH 2 ) 2 —N(CH 3 ) 2 , —O—(CH 2 ) 2-4 OH, —O(CH 2 ) 2 OCH 3 , an optionally substituted —O(CH 2 ) 0-2 -cyclopentanone, an optionally substituted —O(CH 2 ) 0-2 pyrrolidinone, an optionally substituted —O(CH 2 ) 0-2 -morpholinyl, an optionally substituted —O(CH 2 ) 0-2 -triazole, an optionally substituted —O(CH 2 ) 0-2 -imidazole, an optionally substituted —O(CH 2 ) 0-2 -pyrazole, an optionally substituted —O(CH 2 ) 0-2 -tetrahydrofuran, an optionally substituted —O(CH 2 ) 0-2 -pyrrolidinone, an optionally substituted —O(CH 2 ) 0-2 -tetrazole, an optionally substituted —O(CH 2 ) 0-2 -tetrazolone,

10. The compound of claim 7 , or a pharmaceutically acceptable salt thereof, wherein A is a di-substituted phenyl.

11. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein Y is an optionally substituted aryl.

12. The compound of claim 11 , or a pharmaceutically acceptable salt thereof, wherein Y is a mono-substituted phenyl.

13. The compound of claim 11 , or a pharmaceutically acceptable salt thereof, wherein Y is a di-substituted phenyl.

14. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein Y is unsubstituted.

15. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein Y is substituted with one or more R B , wherein each R B is independently selected from the group consisting of: cyano, halogen, an optionally substituted C 1-4 alkyl, an unsubstituted C 2-4 alkenyl, an unsubstituted C 2-4 alkynyl, an optionally substituted aryl, an optionally substituted 5 or 6 membered heteroaryl, an optionally substituted 5 or 6 membered heterocyclyl, hydroxy, C 1-4 alkoxy, alkoxyalkyl, C 1-4 haloalkyl, haloalkoxy, an unsubstituted acyl, an optionally substituted —C-carboxy, an optionally substituted —C-amido, sulfonyl, carbonyl, amino, mono-substituted amine, di-substituted amine and

16. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein Y is an optionally substituted benzothiophene.

17. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein Y is an optionally substituted benzofuran or an optionally substituted indole.

18. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein the compound is:

or a pharmaceutically acceptable salt thereof.

19. The compound of claim 1 , or a pharmaceutically acceptable salt thereof, wherein the compound is:

or a pharmaceutically acceptable salt thereof.

20. A pharmaceutical composition comprising an effective amount of a compound of claim 1 , or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier, diluent, excipient, or combination thereof.

21. A method of ameliorating or treating a paramyxovirus infection, comprising administering to a subject suffering from the paramyxovirus infection an effective amount of a compound of claim 1 , or a pharmaceutically acceptable salt thereof.

22. A method of ameliorating or treating a paramyxovirus infection, comprising contacting a cell infected with the paramyxovirus with an effective amount of a compound of claim 1 , or a pharmaceutically acceptable salt thereof.

23. The method of claim 21 , wherein the paramyxovirus infection is a human respiratory syncytial virus infection.

24. A method for inhibiting viral replication of a paramyxovirus, comprising contacting a cell infected with the paramyxovirus with an effective amount of a compound of claim 1 , or a pharmaceutically acceptable salt thereof.

25. The method of claim 24 , further comprising contacting the cell with an effective amount with one or more additional anti-RSV agents, wherein each of the one or more additional anti-RSV agents is selected from the group consisting of an anti-RSV antibody, a fusion protein inhibitor, an N-protein inhibitor, an RSV polymerase inhibitor, an IMPDH inhibitor, an interferon and any other compound that inhibits RSV virus, and pharmaceutically acceptable salts thereof.