Anthelmintic Heterocyclic Compounds

1 - 15 . (canceled)

16 . A method for the treatment or prevention of a parasitic infection in an animal comprising administering a compound of formula (I), or a salt thereof, to the animal:

wherein:

W 1 , W 2 , W 3 and W 4 are independently C—H or N;

R 1 is hydrogen, cyano, optionally substituted alkoxy, optionally substituted haloalkoxy, optionally substituted aryloxy, optionally substituted alkyl, optionally substituted haloalkyl, optionally substituted C 3 -C 8 -cycloalkyl, optionally substituted alkenyl, optionally substituted haloalkenyl, optionally substituted alkynyl, optionally substituted haloalkynyl, optionally substituted aryl; optionally substituted alkylcarbonyl, optionally substituted alkoxycarbonyl, optionally substituted aminocarbonyl, optionally substituted alkylaminocarbonyl, optionally substituted dialkylaminocarbonyl, optionally substituted alkyl-SO n , haloalkyl-SO n , amino, NH-optionally substituted alkyl, or NR a R b wherein R a and R b are independently optionally substituted C 1 -C 4 alkyl; or R a and R b may form, with the nitrogen to which they are attached, a 3, 4, 5, 6, 7, or 8-membered heterocyclyl group, which may be optionally substituted;

R 2 is hydrogen, halogen, cyano, optionally substituted alkoxy, optionally substituted aryloxy, optionally substituted alkyl, optionally substituted C 3 -C 8 -cycloalkyl, or SO m (optionally substituted alkyl);

R 3 is selected from the group consisting of 6- or 10-membered aryl and 5- to 10-membered heteroaryl, each of which may be optionally substituted with 1, 2, 3, 4 or 5 substituents;

each R 4 is independently hydrogen, halogen, cyano, nitro, —OH, optionally substituted alkyl, optionally substituted alkoxy, optionally substituted cycloalkyl, -amino, NH-optionally substituted alkyl, SFS, or —NR c R d wherein R c and R d are independently optionally substituted alkyl; or R c and R d may form, with the nitrogen to which they are attached, a 3, 4, 5, 6, 7, or 8-membered heterocyclyl group, which may be optionally substituted, SO p (optionally substituted C 1 -C 4 -alkyl);

o is 0, 1, 2, 3, or 4;

m, n, and p are independently 0, 1, or 2;

g is 0 or 1;

X and Y are independently CR 5 R 6 , O, S, or N—R 7 , wherein at least one of X and Y is CR 5 R 6 ;

R 5 and R 6 are independently hydrogen, fluorine or C 1 -C 4 -alkyl;

R 7 is hydrogen or C 1 -C 4 -alkyl.

17 - 20 . (canceled)

21 . The method of claim 16 , wherein R 1 is C 1 -C 4 -alkyl or —NR c R d .

22 . The method of claim 16 , wherein R 1 is aziridinyl, azetidinyl, pyrrolidinyl, pyrrolyl, or morpholinyl, all of which are optionally substituted by one or more halogen.

23 . The method of claim 16 , wherein R 2 is hydrogen, alkyl, or haloalkyl.

24 . The method of claim 16 , wherein R 3 is phenyl optionally substituted with one or more halo, cyano, nitro, alkylsulfonyl, haloalkylsulfonyl, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, haloalkyl, haloalkenyl, haloalkynyl, halocycloalkyl, halocycloalkenyl, alkoxy, alkenyloxy, alkynyloxy, haloalkoxy or haloalkenyloxy.

25 . The method of claim 24 , wherein R 3 is dihalophenyl or trihalophenyl.

26 . The method of claim 16 , wherein q is 1.

27 . The method of claim 16 , wherein q is 0.

28 . The method of claim 16 , wherein X is CH 2 or O.

29 . The method of claim 16 , wherein Y is CH 2 .

30 . A method for the treatment or prevention of a parasitic infection in an animal comprising administering an effective amount of a compound of formula (IA), or a salt thereof, to the animal in need thereof:

wherein:

W 5 , W 6 and W 7 are independently CH, N or S;

R 1 is hydrogen, cyano, optionally substituted alkoxy, optionally substituted haloalkoxy, optionally substituted aryloxy, optionally substituted alkyl, optionally substituted haloalkyl, optionally substituted C 3 -C 8 -cycloalkyl, optionally substituted alkenyl, optionally substituted haloalkenyl, optionally substituted alkynyl, optionally substituted haloalkynyl, optionally substituted aryl; optionally substituted alkylcarbonyl, optionally substituted alkoxycarbonyl, optionally substituted aminocarbonyl, optionally substituted alkylaminocarbonyl, optionally substituted dialkylaminocarbonyl, optionally substituted alkyl-SO n , haloalkyl-SO n , amino, NH-optionally substituted alkyl, or NR a R b wherein R a and R b are independently optionally substituted C 1 -C 4 alkyl; or R a and R b may form, with the nitrogen to which they are attached, a 3, 4, 5, 6, 7, or 8 membered-heterocyclyl group, which may be optionally substituted;

R 2 is hydrogen, halogen, cyano, optionally substituted alkoxy, optionally substituted aryloxy, optionally substituted alkyl, optionally substituted C 3 -C 8 -cycloalkyl, or SO m (optionally substituted alkyl);

R 3 is selected from the group consisting of 6- or 10-membered aryl and 5- to 10-membered heteroaryl, each of which may be optionally substituted with 1, 2, 3, 4 or 5 substituents;

each R 4 is independently hydrogen, halogen, cyano, nitro, —OH, optionally substituted alkyl, optionally substituted alkoxy, optionally substituted cycloalkyl, -amino, NH-optionally substituted alkyl, SF 5 , or NR c R d wherein R c and R d are independently optionally substituted alkyl; or R c and R d may form, with the nitrogen to which they are attached, a 3, 4, 5, 6, 7, or 8 membered-heterocyclyl group, which may be optionally substituted, SO p (optionally substituted C 1 -C 4 -alkyl);

o is 0, 1, 2, 3, or 4;

m, n, and p are independently 0, 1, or 2;

q is 0 or 1;

X and Y are independently CR 5 R 6 , O, S, or N—R 7 , wherein at least one of X and Y is CR 5 R 6 ;

R 5 and R 6 are independently hydrogen, fluorine or C 1 -C 4 -alkyl; and

R 7 is hydrogen or C 1 -C 4 -alkyl.

31 . The method of claim 30 , wherein R 1 is C 1 -C 4 -alkyl or heterocyclyl.

32 . The method of claim 30 , wherein R 1 is aziridinyl, azetidinyl, oxetanyl, pyrrolidinyl, pyrrolyl, or morpholinyl, all of which are optionally substituted by one or more halogen.

33 . The method of claim 30 , wherein R 2 is hydrogen, alkyl, or haloalkyl.

34 . The method of claim 30 , wherein R 3 is phenyl optionally substituted with one or more halo, cyano, nitro, alkylsulfonyl, haloalkylsulfonyl, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkenyl, haloalkyl, haloalkenyl, haloalkynyl, halocycloalkyl, halocycloalkenyl, alkoxy, alkenyloxy, alkynyloxy, haloalkoxy or haloalkenyloxy.

35 . The method of claim 34 , wherein R 3 is dihalophenyl or trihalophenyl.

36 . The method of claim 30 , wherein q is 1.

37 . The method of claim 30 , wherein q is 0.

38 . The method of claim 30 , wherein X is CH 2 or O.

39 . The method of claim 30 , wherein Y is CH 2 .

40 . The method of claim 16 , wherein the parasite is a helminth.

41 . The method of claim 30 , wherein the parasite is a helminth.

42 . The method of claim 16 , wherein the parasite is a heartworm, a hookworm, a whipworm or a roundworm.

43 . The method of claim 30 , wherein the parasite is a heartworm, a hookworm, a whipworm or a roundworm.

44 . The method of claim 16 , wherein the parasite is Dirofilaria immitis.

45 . The method of claim 30 , wherein the parasite is Dirofilaria immitis.

46 . The method of claim 16 , wherein the parasite is Anaplocephala ( Anoplocephala ), Ancylostoma, Necator, Ascaris, Brugia, Bunostomum, Capillaria, Chabertia, Cooperia, Cyathostomum, Cylicocyclus, Cylicodontophorus, Cylicostephanus, Craterostomum, Dictyocaulus, Dipetalonema, Dipylidium, Dirofilaria, Dracunculus, Echinococcus, Enterobius, Fasciola, Filaroides, Habronema, Haemonchus, Metastrongylus, Moniezia, Necator, Nematodirus, Nippostrongylus, Oesophagostomum, Onchocerca, Ostertagia, Oxyuris, Parascaris, Schistosoma, Strongylus, Taenia, Toxocara, Strongyloides, Toxascaris, Trichinella, Trichuris, Trichostrongylus, Triodontophorus, Uncinaria or Wuchereria.

47 . The method of claim 30 , wherein the parasite is Anaplocephala ( Anoplocephala ), Ancylostoma, Necator, Ascaris, Brugia, Bunostomum, Capillaria, Chabertia, Cooperia, Cyathostomum, Cylicocyclus, Cylicodontophorus, Cylicostephanus, Craterostomum, Dictyocaulus, Dipetalonema, Dipylidium, Dirofilaria, Dracunculus, Echinococcus, Enterobius, Fasciola, Filaroides, Habronema, Haemonchus, Metastrongylus, Moniezia, Necator, Nematodirus, Nippostrongylus, Oesophagostomum, Onchocerca, Ostertagia, Oxyuris, Parascaris, Schistosoma, Strongylus, Taenia, Toxocara, Strongyloides, Toxascaris, Trichinella, Trichuris, Trichostrongylus, Triodontophorus, Uncinaria or Wuchereria.

48 . The method of claim 16 , wherein the animal is a cat, a dog, a horse or cattle.

49 . The method of claim 30 , wherein the animal is a cat, a dog, a horse or cattle