Acetamides and benzamides that are useful in treating sexual dysfunction

1. A method of treating sexual dysfunction in a mammal comprising administering to said mammal in need of such treatment a therapeutically effective amount of a compound of formula (I)

or a pharmaceutically acceptable salt thereof, wherein

A is selected from the group consisting of aryl, arylalkyl, cycloalkyl, cycloalkylalkyl, heterocycle, and heterocyclealkyl;

L is selected from the group consisting of —N(R 7 )C(O)—, and —C(O)N(R 7 )—, wherein the left end of said —N(R 7 )C(O)—, or —C(O)N(R 7 )—, is attached to A and the right end is attached to D;

D is selected from the group consisting of alkylene, fluoroalkylene, and hydroxyalkylene;

Z is selected from the group consisting of C and CR B , wherein R B is hydrogen;

R A is selected from the group consisting of hydrogen and alkyl;

— is a bond when Z is C and — is absent when Z is CR B ;

B is selected from the group consisting of:

R 1 , R 2 , R 3 , R 4 and R 5 are each independently selected from the group consisting of hydrogen, alkoxy, alkenyl, alkyl, alkylsulfinyl, alkylsulfonyl, alkylthio, alkynyl, alkoxycarbonyl, alkylcarbonyl, alkylcarbonyloxy, carboxy, cyano, formyl, halogen, haloalkoxy, haloalkyl, hydroxy, hydroxyalkyl, mercapto, nitro, —NZ 1 Z 2 , (NZ 3 Z 4 )carbonyl, and (NZ 3 Z 4 )sulfonyl;

Z 1 and Z 2 are each independently selected from the group consisting of hydrogen, alkyl, alkylcarbonyl, alkylsulfonyl, aryl, arylalkyl, arylalkylsulfonyl, arylsulfonyl, and formyl;

Z 3 and Z 4 are each independently selected from the group consisting of hydrogen, alkyl, aryl, and arylalkyl;

X is selected from the group consisting of N(R 6 ), O and S;

Y is selected from the group consisting of C(R 4 ) and N;

R 6 is selected from the group consisting of hydrogen and alkyl; and

R 7 is selected from the group consisting of hydrogen and alkyl.

2. The method according to claim 1 wherein

A is aryl;

B is

Z is N;

— is absent; and

L is —N(R 7 )C(O)—.

3. The method according to claim 1 wherein

A is aryl wherein the aryl is phenyl substituted with 0, 1, 2, 3, 4, or 5 substituents selected from the group consisting of alkenyl, alkoxy, alkoxycarbonyl, alkyl, alkythio, benzyl, cyano, halogen, haloalkoxy, haloalkyl, methylenedioxy, nitro, phenyl, and —NZ 1 Z 2 ;

B is

R 1 , R 2 , R 3 , and R 4 are hydrogen;

Z is CR B ;

— is absent;

D is —CH 2 —; and

L is —N(R 7 )C(O)—.

4. The method according to claim 1 wherein

A is aryl;

B is

Z is CR B ;

— is absent; and

L is —C(O)N(R 7 )—.

5. The method according to claim 1 wherein

A is aryl wherein the aryl is phenyl substituted with 0, 1, 2, 3, 4, or 5 substituents selected from the group consisting of alkenyl, alkoxy, alkoxycarbonyl, alkyl, alkythio, benzyl, cyano, halogen, haloalkoxy, haloalkyl, methylenedioxy, nitro, phenyl, and —NZ 1 Z 2 ;

B is

R 1 is selected from the group consisting of hydrogen, alkyl, cyano, haloalkyl, halogen, nitro, (NZ 3 Z 4 )alkyl, and (NZ 3 Z 4 )carbonyl;

R 2 and R 4 are hydrogen;

R 3 is selected from the group consisting of hydrogen and hydroxy;

Z is CR B ;

R B id hydrogen;

— is absent;

D is —CH 2 —; and

L is —C(O)N(R 7 )—.

6. The method according to claim 1 wherein

A is aryl;

B is

Z is CR B ;

— is absent; and

L is —C(O)N(R 7 )—.

7. The method according to claim 1 wherein

A is aryl wherein the aryl is phenyl substituted with 0, 1, 2, 3, 4, or 5 substituents selected from the group consisting of alkenyl, alkoxy, alkoxycarbonyl, alkyl, alkylthio, benzyl, cyano, halogen, haloalkoxy, haloalkyl, methylenedioxy, nitro, phenyl, and —NZ 1 Z 2 ;

B is

R 1 , R 2 , R 3 , and R 4 are hydrogen;

Z is CR B ;

R B is hydrogen;

— is absent;

D is —CH 2 —; and

L is —C(O)N(R 7 )—.

8. The method according to claim 1 wherein the compound of formula (I) is selected from the group consisting of

N-(3-methylphenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(4-bromophenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(2,6-dimethylphenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(2-nitrophenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(3-nitrophenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(2,4-difluorophenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(2,5-dimethylphenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(2-methylphenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(4-methylphenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

2-[4-(2-pyridinyl)-1-piperidinyl]-N-[3-(trifluoromethyl)phenyl]acetamide;

ethyl 4-({[4-(2-pyridinyl)-1-piperidinyl]acetyl}amino)benzoate;

N-(3-chloro-4-methylphenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(2-cyanophenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(3-chlorophenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

2-[4-(3-cyano-2-pyridinyl)-1-piperidinyl]-N-(3-methylphenyl)acetamide;

N-(4-fluorophenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(3,5-dichlorophenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(2,3-dichlorophenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

2-[4-(2-pyridinyl)-1-piperidinyl]-N-[2-(trifluoromethyl)phenyl]acetamide;

N-(3-chloro-4-fluorophenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

2-[4-(2-pyridinyl)-1-piperidinyl]-N-[4-(trifluoromethoxy)phenyl]acetamide;

N-Cyclohexyl-2-(3′,4′,5′,6′-tetrahydro-2′H-[2,4′]bipyridinyl-1′-yl)acetamide;

N-{[4-(2-methoxyphenyl)-1-piperidinyl]methyl}-3-methylbenzamide;

3-methyl-N-{[4-(2-pyridinyl)-1-piperidinyl]methyl}benzamide;

2-(1-{2-[(3-methylphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridiniumn N-oxide;

N-{[4-(2-pyridinyl)-1-piperidinyl]methyl}-3-(trifluoromethyl)benzamide;

3,5-dimethoxy-N-{[4-(2-pyridinyl)-1-piperidinyl]methyl}benzamide;

N-{[4-(2-pyridinyl)-1-piperidinyl]methyl }cyclohexanecarboxamide;

3,4-difluoro-N-{[4-(2-pyridinyl)-1-piperidinyl]methyl}benzamide;

3-chloro-N-{[4-(2-pyridinyl)-1-piperidinyl]methyl}benzamide;

N-(3-methylphenyl)-2-(4-phenyl-1-piperidinyl)acetamide;

3,5-dimethyl-N-{[4-(2-pyridinyl)-1-piperidinyl]methyl}benzamide;

N-(2,6-diethylphenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

2-[4-(2-pyridinyl)-1-piperidinyl]-N-(2,4,6-trifluorophenyl)acetamide;

N-(4-chloro-2,6-dimethylphenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

2-[4-(2-pyridinyl)-1-piperidinyl]-N-(2,4,6-trichlorophenyl)acetamide;

2-[4-(3-cyano-2-pyridinyl)-1-piperidinyl]-N-(2,6-dimethylphenyl)acetamide;

N-(2-ethyl-6-methylphenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(2-isopropyl-6-methylphenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(2-chloro-6-methylphenyl)-2-[4-(2-pyridinyl)-1-piperidinyl]acetamide;

N-(2-methoxy-6-methylphenyl)-2-[4-(2-pyridinyl)-1- 1 piperidinyl]acetamide;

2-(1-{2-[(4-fluoro-2-methylphenyl)amino]-2-oxoethyl}-4-piperidinyl)pyridinium N-oxide;

2-(1-{2-[(4-fluoro-3-methylphenyl)amino]-2-oxoethyl}-4-piperidinyl)pyridinium N-oxide;

2-(1-{2-[(3-fluorophenyl)amino]-2-oxoethyl}-4-piperidinyl)pyridinium N-oxide;

2-(1-{2-[(2-fluoro-5-methylphenyl)amino]-2-oxoethyl}-4-piperidinyl)pyridinium N-oxide;

2-(1-{1-methyl-2-[(3-methylphenyl)amino]-2-oxoethyl}-4-piperidinyl)pyridinium N-oxide;

2-(1-{2-[(4-fluorophenyl)amino]-2-oxoethyl}-4-piperidinyl)pyridinium N-oxide;

2-(1-{2-[(2-fluorophenyl)amino]-2-oxoethyl}-4-piperidinyl)pyridinium N-oxide;

2-(1-{2-[(3-chlorophenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{2-oxo-2-[(2,4,6-tribromo-3-methylphenyl)amino]ethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(4-bromo-3-methylbenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

N-(3-methylphenyl)-2-(4-pyridin-2-ylpiperidin-1-yl)ethanethioamide;

2-(1-{2-[(3,5-dichlorophenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{2-[(2,3-dichlorophenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{2-[(2-methoxy-6-methylphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-{1-[2-(1,1′-biphenyl-3-ylamino)-2-oxoethyl]piperidin-4-yl}pyridinium N-oxide;

2-(1-{2-[(3-ethylphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-{1-[2-(2,3-dihydro-1H-inden-5-ylamino)-2-oxoethyl]piperidin-4-yl}pyridinium N-oxide;

2-{1-[2-oxo-2-(5,6,7,8-tetrahydronaphthalen-1-ylamino)ethyl]piperidin-4-yl}pyridinium N-oxide;

2-(1-{2-[(3-isopropoxyphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{2-[(3,5-dimethylphenyl)amino]l-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{2-[(4-bromo-2-methylphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-[1-(2-oxo-2-{[3-(trifluoromethoxy)phenyl]amino}ethyl)piperidin-4-yl]pyridinium N-oxide;

2-(1-{2-[(5-methyl-2-nitrophenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{2-[(2,6-dimethylphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{2-[(2,6-dichloro-3-methylphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-[1-(2-{[3-(methylthio)phenyl]amino}-2-oxoethyl)piperidin-4-yl]pyridinium N-oxide;

2-(1-{2-[(5-chloro-2-methylphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{2-[(2,5-dimethoxyphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{2-[(3,5-dimethoxyphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-[1-(2-{[3-(dimethylamino)phenyl]amino}-2-oxoethyl)piperidin-4-yl]pyridinium N-oxide;

2-(1-{2-[(3-isopropylphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{2-[(3-chloro-2-methylphenyl)amino]-2-oxoethyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(2,3-dibromo-5-methylbenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-{1-[(benzoylamino)methyl]piperidin-4-yl}pyridinium N-oxide;

2-(1-{[(4-chloro-3-methylbenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(4-fluoro-3-methylbenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-[1-({[3-chloro-4-(trifluoromethoxy)benzoyl]amino}methyl)piperidin-4-yl]pyridinium N-oxide;

2-(1-{[(3-ethoxybenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(3,5-dichlorobenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-[1-({[4-methyl-3-(trifluoromethyl)benzoyl]amino}methyl)piperidin-4-yl]pyridinium N-oxide;

2-(1-{[(3,4-dimethylbenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(3-chloro-4-fluorobenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(pyridin-2-ylcarbonyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(3,5-dimethylbenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(3-vinylbenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(4-bromo-3-methylbenzoyl)amino]methyl}-1,2,3,6-tetrahydropyridin-4-yl)pyridinium N-oxide;

2-(1-{[(3-cyanobenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(4-bromobenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(3-chloro-4-methylbenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[methyl(3-methylbenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(3-nitrobenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(2-chloro-5-methylbenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(3-methoxy-2-methylbenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide;

2-(1-{[(4-chloro-3-methoxybenzoyl)amino]methyl}piperidin-4-yl)pyridinium N-oxide; and

N-(3-methylphenyl)-2-(3-pyridin-2-ylpiperidin-1-yl)acetamide.

9. The method according to claim 1 wherein the compound of formula (I) is 2-(1-{[(3-methylbenzoyl)amino]methyl}-4-piperidinyl)pyridinium N-oxide.