Boron-containing small molecules for controlling ectoparasites

1. A compound having a structure of formula I or II:

wherein

A is

 where * is bonded to the carbonyl;

Y is hydrogen, fluoro, chloro, or bromo;

R 1 is phenyl substituted 2-4 times, said substitutions comprising i) 1-4 substitutions with the same or different of halo, and 0-1 substitutions with methyl, difluoromethyl, trifluoromethyl, methoxy, trifluoromethoxy, or trifluoroethoxy, or ii) 2 trifluoromethyl groups;

R 2 is methyl, fluoromethyl, trifluoromethyl, or perfluoroethyl;

R 3a and R 3b are independently selected from hydrogen, methyl, ethyl, fluoromethyl, or R 3a and R 3b combine with the carbon to which they are attached to form a cyclopentyl ring or a cyclohexyl ring;

Z is —CH 2 —, —CH 2 —CH 2 —, —CH(CH 3 )—, or —C(CH 3 ) 2 —; and

R 6 is hydrogen or methyl;

or a salt thereof.

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

Y is hydrogen, fluoro, or chloro;

R 1 is phenyl substituted 2-3 times with the same or different of chloro or fluoro;

R 2 is trifluoromethyl; and

R 3a and R 3b are the same and are selected from hydrogen, methyl, ethyl, fluoromethyl, or R 3a and R 3b combine with the carbon to which they are attached to form a cyclopentyl ring.

3. The compound of claim 1 , or a salt thereof, having a structure which is:

wherein C* is a carbon atom which is a stereocenter having a (S) configuration.

4. The compound of claim 1 , or a salt thereof, having a structure which is:

wherein

Y is hydrogen, fluoro, or chloro;

R 2 is trifluoromethyl;

R 3a and R 3b are each hydrogen, methyl, or fluoromethyl; and

R 1a , R 1b , R 1c , R 1d , and R 1e are each independently selected from hydrogen, fluoro, chloro, bromo, methyl, difluoromethyl, trifluoromethyl, methoxy, trifluoromethoxy, or trifluoroethoxy.

5. The compound of claim 1 , or a salt thereof, having a structure which is:

wherein

Y is hydrogen, fluoro, or chloro;

R 2 is trifluoromethyl;

R 3a and R 3b are each hydrogen, methyl, or fluoromethyl; and

R 1b , R 1c , and R 1d are each independently selected from hydrogen, fluoro, chloro, bromo, methyl, difluoromethyl, trifluoromethyl, methoxy, trifluoromethoxy, or trifluoroethoxy.

6. The compound of claim 1 , or a salt thereof, having a structure which is:

wherein

Y is hydrogen, fluoro, or chloro;

R 2 is trifluoromethyl;

R 3a and R 3b are each hydrogen, methyl, or fluoromethyl; and

R 1b , R 1c , and R 1d are each independently selected from hydrogen, fluoro, chloro, bromo, methyl, difluoromethyl, trifluoromethyl, methoxy, trifluoromethoxy, or trifluoroethoxy.

7. The compound of claim 1 , or a salt thereof, having a structure which is:

wherein

Y is hydrogen, fluoro, or chloro;

R 2 is trifluoromethyl;

R 3a and R 3b are each hydrogen, methyl, or fluoromethyl; and

R 1b , R 1c , and R 1d are each independently selected from hydrogen, fluoro, chloro, bromo, methyl, difluoromethyl, trifluoromethyl, methoxy, trifluoromethoxy, or trifluoroethoxy.

8. The compound of claim 1 , or a salt thereof, having a structure which is:

wherein

Y is hydrogen, fluoro, or chloro;

R 2 is trifluoromethyl;

R 3a and R 3b are each hydrogen, methyl, or fluoromethyl; and

R 1b , R 1c , and R 1d are each independently selected from hydrogen, fluoro, chloro, bromo, methyl, difluoromethyl, trifluoromethyl, methoxy, trifluoromethoxy, or trifluoroethoxy.

9. The compound of claim 1 , or a salt thereof, having a structure which is:

wherein

Y is hydrogen, fluoro, or chloro;

R 3a and R 3b are each methyl or fluoromethyl; and

R 1b , R 1c , and R 1d are each independently selected from hydrogen, chloro, or fluoro.

10. The compound of claim 9 , or a salt thereof, wherein Y is hydrogen, R 3a and R 3b are each methyl, R 1b is chloro, R 1c is chloro or fluoro; and R 1d is chloro.

11. The compound of claim 1 , or a salt thereof, wherein the compound is

N-((1-Hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-5-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

4-(5-(3,5-Dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-5-yl)methyl)-2-methylbenzamide;

4-(5-(3,5-Dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-5-yl)methyl)-2-methylbenzamide;

4-(5-(3,5-Dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methylbenzamide;

4-(5-(3,5-Dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-(2-((1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methylamino)-2-oxoethyl)-2-methylbenzamide;

4-(5-(3,5-Dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl benzamide;

4-(5-(3,5-Dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-N,2-dimethylbenzamide;

N-((1-Hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

4-(5-(3,5-Dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methylbenzamide;

(S)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

(R)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

(S)-4-(5-(3,5-Dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methylbenzamide;

(R)-4-(5-(3,5-Dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methylbenzamide;

4-(5-(3,5-Dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((3,3-diethyl-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methylbenzamide;

4-(5-(3,5-Dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((3,3-diethyl-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methylbenzamide;

4-(5-(3,4,5-Trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((3,3-diethyl-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methylbenzamide;

N-((3,3-Bis(fluoromethyl)-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-4-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-2-methylbenzamide;

N-((3,3-Bis(fluoromethyl)-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

(S)-N-((3,3-Bis(fluoromethyl)-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

N-((1-Hydroxy-1H-spiro[benzo[c][1,2]oxaborole-3,1′-cyclopentan]-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

N-(2-(1-Hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

4-(5-(3,5-Dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-(2-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)-2-methylbenzamide;

4-(5-(3,5-Dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-(2-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)-2-methylbenzamide;

N-(1-(1-Hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

(S)-N-(1-(1-Hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

N-(2-(1-Hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)propan-2-yl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

N-((4-fluoro-1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

N-((5-chloro-1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

(S)-N-((5-chloro-1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide;

5-(5-(3,5-Dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-8-carboxamide;

8-(5-(3,5-Dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-5-carboxamide;

N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-5-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

N-((1-Hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

5-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-8-carboxamide;

8-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-5-carboxamide;

(S)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-5-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

(S)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

(R)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-5-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

(R)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

(S)-5-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-8-carboxamide;

(S)-8-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-5-carboxamide;

(R)-5-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-8-carboxamide;

(R)-8-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-5-carboxamide;

N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-5-yl)methyl)-5-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-5-yl)methyl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

5-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-5-yl)methyl)indolizine-8-carboxamide;

8-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-5-yl)methyl)indolizine-5-carboxamide;

5-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-5-yl)methyl)indolizine-8-carboxamide;

8-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-5-yl)methyl)indolizine-5-carboxamide;

5-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-8-carboxamide;

8-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-5-carboxamide;

5-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-N-methylindolizine-8-carboxamide;

8-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-N-methylindolizine-5-carboxamide;

5-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((3,3-diethyl-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-8-carboxamide;

8-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((3,3-diethyl-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-5-carboxamide;

5-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((3,3-diethyl-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-8-carboxamide;

8-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((3,3-diethyl-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)indolizine-5-carboxamide;

N-((3,3-diethyl-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-5-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

N-((3,3-diethyl-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

N-((3,3-bis(fluoromethyl)-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-5-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

N-((3,3-bis(fluoromethyl)-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-8-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

N-((3,3-bis(fluoromethyl)-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-5-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

N-((3,3-bis(fluoromethyl)-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

N-((1-hydroxy-1H-spiro[benzo[c][1,2]oxaborole-3,1′-cyclopentan]-6-yl)methyl)-5-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

N-((1-hydroxy-1H-spiro[benzo[c][1,2]oxaborole-3,1′-cyclopentan]-6-yl)methyl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

N-(2-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)-5-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

N-(2-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

5-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-(2-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)indolizine-8-carboxamide;

8-(5-(3,5-dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-(2-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)indolizine-5-carboxamide;

5-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-(2-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)indolizine-8-carboxamide;

8-(5-(3,5-dichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-(2-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)indolizine-5-carboxamide;

N-(1-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)-5-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

N-(1-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

N-(2-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)propan-2-yl)-5-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

N-(2-(1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)propan-2-yl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

N-((4-fluoro-1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide;

N-((4-fluoro-1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide;

N-((5-chloro-1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-8-carboxamide; or

N-((5-chloro-1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-8-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)indolizine-5-carboxamide.

12. The compound of claim 1 , or a salt thereof, wherein it is

N-((1-Hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide.

13. The compounds of claim 1 , or a salt thereof, wherein it is

(S)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide.

14. The compound of claim 1 , or a salt thereof, wherein it is

4-(5-(3,5-Dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methylbenzamide.

15. The compound of claim 1 , or a salt thereof, wherein it is

(S)-4-(5-(3,5-Dichloro-4-fluorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)-N-((1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methylbenzamide.

16. The compound of claim 1 , or a salt thereof, wherein it is

N-((3,3-Bis(fluoromethyl)-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide.

17. The compound of claim 1 , or a salt thereof, wherein it is

(S)-N-((3,3-Bis(fluoromethyl)-1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide.

18. The compound of claim 1 , or a salt thereof, wherein it is

N-(1-(1-Hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide.

19. The compound of claim 1 , or a salt thereof, wherein it is

(S)-N-(1-(1-Hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)ethyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydro is oxazol-3-yl)benzamide.

20. The compound of claim 1 , or a salt thereof, wherein it is

N-((5-chloro-1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide.

21. The compound of claim 1 , or a salt thereof, wherein it is

(S)-N-((5-chloro-1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborol-6-yl)methyl)-2-methyl-4-(5-(3,4,5-trichlorophenyl)-5-(trifluoromethyl)-4,5-dihydroisoxazol-3-yl)benzamide.

22. A formulation comprising a compound of claim 1 , or a salt thereof, and at least one pharmaceutically acceptable excipient.

23. The formulation of claim 22 , wherein said formulation further comprises at least one additional active ingredient.

24. The formulation of claim 22 , wherein said formulation is a human pharmaceutical formulation.

25. The formulation of claim 22 , wherein said formulation is a veterinary pharmaceutical formulation.

26. The formulation of claim 22 , wherein said formulation is an oral formulation.

27. The formulation of claim 26 , wherein said formulation is in a unit dosage form.

28. A method of killing and/or preventing the growth of an ectoparasite, comprising contacting said ectoparasite with an effective amount of a compound of claim 1 , or a salt thereof.

29. The method of claim 28 , wherein the ectoparasite is a tick or a flea.

30. The method of claim 28 , wherein the ectoparasite is in or on an animal.

31. A method of controlling an ectoparasitic infestation in or on an animal in need of treatment thereof, comprising administering to said animal a therapeutically effective amount of a compound of claim 1 , or a salt thereof.

32. The method of claim 31 , wherein said animal is a dog or a cat.

33. The method of claim 32 , wherein said administration is oral and said ectoparasite is a tick or flea.

34. The compound of claim 1 , or a salt thereof, for use in therapy.

35. The compound of claim 34 , wherein said therapy is killing and/or preventing the growth of an ectoparasite, controlling an ectoparasitic infestation in or on an animal, or treatment and/or prophylaxis of an ectoparasitic infestation.

36. The compound of claim 1 , or a salt thereof, for use in controlling an ectoparasite infestation.