Parasiticidal compositions comprising an isoxazoline active agent, methods and uses thereof

1. A spot-on veterinary composition for treating or preventing a parasitic infestation in an animal comprising:

(a) from about 1 to about 25% (w/v) of at least one isoxazoline active agent of Formula (I):

or a pharmaceutically acceptable salt thereof

wherein:

A 1 , A 2 , A 3 , A 4 , A 5 and A 6 are independently selected from the group consisting of CR 3 and N, provided that at most 3 of A 1 , A 2 , A 3 , A 4 , A 5 and A 6 are N;

B 1 , B 2 and B 3 are independently selected from the group consisting of CR 2 and N;

W is O or S;

R 1 is C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 3 -C 6 cycloalkyl, C 4 -C 7 alkylcycloalkyl or C 4 -C 7 cycloalkylalkyl, each optionally substituted with one or more substituents independently selected from R 6 ;

each R 2 is independently H, halogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 1 -C 6 alkoxy, C 1 -C 6 haloalkoxy, C 1 -C 6 alkylthio, C 1 -C 6 haloalkylthio, C 1 -C 6 alkylsulfinyl, C 1 -C 6 haloalkylsulfinyl, C 1 -C 6 alkylsulfonyl, C 1 -C 6 haloalkylsulfonyl, C 1 -C 6 alkylamino, C 2 -C 6 dialkylamino, C 2 -C 4 alkoxycarbonyl, —CN or —NO 2 ;

each R 3 is independently H, halogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 3 -C 6 cycloalkyl, C 3 -C 6 halocycloalkyl, C 1 -C 6 alkoxy, C 1 -C 6 haloalkoxy, C 1 -C 6 alkylthio, C 1 -C 6 haloalkylthio, C 1 -C 6 alkylsulfinyl, C 1 -C 6 haloalkylsulfinyl, C 1 -C 6 alkylsulfonyl, C 1 -C 6 haloalkylsulfonyl, C 1 -C 6 alkylamino, C 2 -C 6 dialkylamino, —CN or —NO 2 ;

R 4 is H, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 3 -C 6 cycloalkyl, C 4 -C 7 alkylcycloalkyl, C 4 -C 7 cycloalkylalkyl, C 2 -C 7 alkylcarbonyl or C 2 -C 7 alkoxycarbonyl;

R 5 is H, OR 10 , NR 11 R 12 or Q 1 ; or C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 3 -C 6 cycloalkyl, C 4 -C 7 alkylcycloalkyl or C 4 -C 7 cycloalkylalkyl, each optionally substituted with one or more substituents independently selected from R 7 ; or

R 4 and R 5 are taken together with the nitrogen to which they are attached to form a ring containing 2 to 6 atoms of carbon and optionally one additional atom selected from the group consisting of N, S and 0, said ring optionally substituted with 1 to 4 substituents independently selected from the group consisting of C 1 -C 2 alkyl, halogen, —CN, —NO 2 and C 1 -C 2 alkoxy;

each R 6 is independently halogen, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, C 1 -C 6 alkylthio, C 1 -C 6 alkylsulfinyl, C 1 -C 6 alkylsulfonyl, —CN or —NO 2 ;

each R 7 is independently halogen; C 1 -C 6 alkyl, C 3 -C 6 cycloalkyl, C 1 -C 6 alkoxy, C 1 -C 6 alkylthio, C 1 -C 6 alkylsulfinyl, C 1 -C 6 alkylsulfonyl, C 1 -C 6 alkylamino, C 2 -C 8 dialkylamino, C 3 -C 6 cycloalkylamino, C 2 -C 7 alkylcarbonyl, C 2 -C 7 alkoxycarbonyl, C 2 -C 7 alkylaminocarbonyl, C 3 -C 9 dialkylaminocarbonyl, C 2 -C 7 haloalkylcarbonyl, C 2 -C 7 haloalkoxycarbonyl, C 2 -C 7 haloalkylaminocarbonyl, C 3 -C 9 dihaloalkylaminocarbonyl, hydroxy, —NH 2 , —CN or —NO 2 ; or Q 2 ;

each R 8 is independently halogen, C 1 -C 6 alkoxy, C 1 -C 6 haloalkoxy, C 1 -C 6 alkylthio, C 1 -C 6 haloalkylthio, C 1 -C 6 alkylsulfinyl, C 1 -C 6 haloalkylsulfinyl, C 1 -C 6 alkylsulfonyl, C 1 -C 6 haloalkylsulfonyl, C 1 -C 6 alkylamino, C 2 -C 6 dialkylamino, C 2 -C 4 alkoxycarbonyl, —CN or —NO 2 ;

each R 9 is independently halogen, C 1 -C 6 alkyl, C 1 -C 6 haloalkyl, C 3 -C 6 cycloalkyl, C 3 -C 6 halocycloalkyl, C 1 -C 6 alkoxy, C 1 -C 6 haloalkoxy, C 1 -C 6 alkylthio, C 1 -C 6 haloalkylthio, C 1 -C 6 alkylsulfinyl, C 1 -C 6 haloalkylsulfinyl, C 1 -C 6 alkylsulfonyl, C 1 -C 6 haloalkylsulfonyl, C 1 -C 6 alkylamino, C 2 -C 6 dialkylamino, —CN, —NO 2 , phenyl or pyridinyl;

R 19 is H; or C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 3 -C 6 cycloalkyl, C 4 -C 7 alkylcycloalkyl or C 4 -C 7 cycloalkylalkyl, each optionally substituted with one ef or more halogen;

R 11 is H, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 3 -C 6 cycloalkyl, C 4 -C 7 alkylcycloalkyl, C 4 -C 7 cycloalkylalkyl, C 2 -C 7 alkylcarbonyl or C 2 -C 7 alkoxycarbonyl;

R 12 is H; Q 3 ; or C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 3 -C 6 cycloalkyl, C 4 -C 7 alkylcycloalkyl or C 4 -C 7 cycloalkylalkyl, each optionally substituted with one or more substituents independently selected from R 7 ; or

R 11 and R 12 are taken together with the nitrogen to which they are attached to form a ring containing 2 to 6 atoms of carbon and optionally one additional atom selected from the group consisting of N, S and 0, said ring optionally substituted with 1 to 4 substituents independently selected from the group consisting of C 1 -C 2 alkyl, halogen, —CN, —NO 2 and C 1 -C 2 alkoxy;

Q 1 is a phenyl ring, a 5- or 6-membered heterocyclic ring, or an 8-, 9- or 10-membered fused bicyclic ring system optionally containing one to three heteroatoms selected from the group consisting of up to 1 O, up to 1 S and up to 3 N, each ring or ring system optionally substituted with one or more substituents independently selected from R 8 ;

each Q 2 is independently a phenyl ring or a 5- or 6-membered heterocyclic ring, each ring optionally substituted with one or more substituents independently selected from R 9 ;

Q 3 is a phenyl ring or a 5- or 6-membered heterocyclic ring, each ring optionally substituted with one or more substituents independently selected from R 9 ; and

n is 0, 1 or 2; and

b) a pharmaceutically acceptable carrier, which is suitable for an application to the skin of an animal, comprising a dialkyl ester of a C 10 -C 22 dicarboxylic acid

wherein said spot-on composition is a solution;

wherein about 0.1 ml to about 10 ml of said spot-on composition is applied onto the animal; and

wherein said spot-on composition controls a rate of release of the isoxazoline active agent into the plasma of the animal and enhances the spreading of the isoxazoline active agent on the skin of the animal in order to maintain efficacious levels of the isoxazoline active agent in the plasma of said animal, thereby extending efficacy, wherein said spot-on composition is effective for a period of at least 1 month.

2. The spot-on veterinary composition of claim 1 , wherein:

W is O;

R 4 is H or C 1 -C 6 alkyl;

R 5 is —CH 2 C(O)NHCH 2 CF 3 ;

each of A 1 , A 2 , A 3 , A 4 , A 5 and A 6 is CH;

R 1 is C 1 -C 6 alkyl each optionally substituted with one or more substituents independently selected from R 6 ;

R 6 is halogen or C 1 -C 6 alkyl; and

B 1 , B 2 , and B 3 are independently CH, C-halogen, C—C 1 -C 6 alkyl, C—C 1 -C 6 haloalkyl, or C—C 1 -C 6 alkoxy.

3. The spot-on veterinary composition of claim 1 , wherein:

W is O;

R 1 is CF 3 ;

B 2 is CH;

B 1 is C—Cl;

B 3 is C—CF 3 ;

each of A 1 , A 2 , A 3 , A 4 , A 5 and A 6 is CH;

R 4 is H; and

R 5 is —CH 2 C(O)NHCH 2 CF 3 .

4. The spot-on veterinary composition of claim 1 , wherein the dialkyl ester of a C 10 -C 22 dicarboxylic acid is diethyl sebacate, dibutyl sebacate or diisopropyl sebacate.

5. The spot-on veterinary composition of claim 3 , wherein the dialkyl ester of a C 10 -C 22 dicarboxylic acid is diethyl sebacate, dibutyl sebacate or diisopropyl sebacate.

6. The spot-on veterinary composition of claim 1 , further comprising at least one second active agent, which is an avermectin or milbemycin.

7. The spot-on veterinary composition of claim 5 , further comprising at least one second active agent which is an avermectin or milbemycin.

8. The spot-on veterinary composition of claim 6 , wherein the avermectin or milbemycin is eprinomectin, ivermectin, selamectin, milbemectin, milbemycin D, milbemycin oxime, or moxidectin.

9. The spot-on veterinary composition of claim 7 , wherein the avermectin or milbemycin is eprinomectin, ivermectin, selamectin, milbemectin, milbemycin D, milbemycin oxime, or moxidectin.

10. The spot-on veterinary composition of claim 1 , wherein the isoxazoline active agent of Formula (I) is present in a concentration of about 1 to about 5% (w/v).

11. The spot-on veterinary composition of claim 1 , wherein the isoxazoline active agent of Formula (I) is present in a concentration of about 5 to about 15% (w/v).

12. The spot-on veterinary composition of claim 3 , wherein the isoxazoline active agent of Formula (I) is present in a concentration of about 1 to about 5% (w/v).

13. The spot-on veterinary composition of claim 3 , wherein the isoxazoline active agent of Formula (I) is present in a concentration of about 5 to about 15% (w/v).

14. The spot-on veterinary composition of claim 5 , wherein the isoxazoline active agent of Formula (I) is present in a concentration of about 1 to about 5% (w/v).

15. The spot-on veterinary composition of claim 5 , wherein the isoxazoline active agent of Formula (I) is present in a concentration of about 5 to about 15% (w/v).