Derivatives of dioxan-2-alkyl carbamates, preparation thereof and application thereof in therapeutics

1. A method of treating pain associated with a disease in a patient comprising administering to said patient a therapeutically effective amount of a compound of formula (I):

wherein

R 1 represents a phenyl or naphthalenyl group optionally substituted with one or more halogen atoms or hydroxyl, cyano, nitro, (C 1 -C 3 )alkyl, (C 1 -C 3 )alkoxy, trifluoromethyl, trifluoromethoxy, benzyloxy, (C 3 -C 6 )cycloalkyl-O— or (C 3 -C 6 )cycloalkyl(C 1 -C 3 )alkoxy groups;

R 2 represents

either a group of general formula CHR 3 CONHR 4 ,

or a 2,2,2-trifluoroethyl group,

or an (imidazol-2-yl)methyl group,

or a (benzimidazol-2-yl)methyl group,

or a phenyl group optionally substituted with one or more halogen atoms or cyano, nitro, (C 1 -C 3 )alkyl, (C 1 -C 3 )alkoxy, trifluoromethyl or trifluoromethoxy groups; and

wherein

R 3 represents a hydrogen atom or a methyl group and

R 4 represents a hydrogen atom or a (C 1 -C 3 )alkyl, (C 3 -C 5 )cycloalkyl or (pyridin-4-yl)methyl group;

n represents a number ranging from 1 to 3; or

a pharmaceutically acceptable salt thereof, optionally in combination with one more pharmaceutically acceptable excipients, wherein said disease is an inflammatory disease.

2. A method of treating a disease in a patient comprising administering to said patient a therapeutically effective amount of a compound of formula (I):

wherein

R 1 represents a phenyl or naphthalenyl group optionally substituted with one or more halogen atoms or hydroxyl, cyano, nitro, (C 1 -C 3 )alkyl, (C 1 -C 3 )alkoxy, trifluoromethyl, trifluoromethoxy, benzyloxy, (C 3 -C 6 )cycloalkyl-O—or (C 3 -C 6 )cycloalkyl(C 1 -C 3 )alkoxy groups;

R 2 represents

either a group of general formula CHR 3 CONHR 4 ,

or a 2,2,2-trifluoroethyl group,

or an (imidazol-2-yl)methyl group,

or a (benzimidazol-2-yl)methyl group,

or a phenyl group optionally substituted with one or more halogen atoms or cyano, nitro, (C 1 -C 3 )alkyl, (C 1 -C 3 )alkoxy, trifluoromethyl or trifluoromethoxy groups; and

wherein

R 3 represents a hydrogen atom or a methyl group and

R 4 represents a hydrogen atom or a (C 1 -C 3 )alkyl, (C 3 -C 5 )cycloalkyl or (pyridin-4-yl)methyl group;

n represents a number ranging from 1 to 3; or

a pharmaceutically acceptable salt thereof, optionally in combination with one or more pharmaceutically acceptable excipients, wherein said disease is neurogenic pain.

3. The method according to claim 2 , wherein said neurogenic pain is selected from the group consisting of migraine and neuropathic pain.

4. A method of treating a pain in a patient comprising administering to said patient a therapeutically effective amount of a compound of formula (I):

wherein

R 1 represents a phenyl or naphthalenyl group optionally substituted with one or more halogen atoms or hydroxyl, cyano, nitro, (C 1 -C 3 )alkyl, (C 1 -C 3 )alkoxy, trifluoromethyl, trifluoromethoxy, benzyloxy, (C 3 -C 6 )cycloalkyl-O— or (C 3 -C 6 )cycloalkyl(C 1 -C 3 )alkoxy groups;

R 2 represents

either a group of general formula CHR 3 CONHR 4,

or a 2,2,2-trifluoroethyl group,

or an (imidazol-2-yl)methyl group,

or a (benzimidazol-2-yl)methyl group,

or a phenyl group optionally substituted with one or more halogen atoms or cyano, nitro, (C 1 -C 3 )alkyl, (C 1 -C 3 )alkoxy, trifluoromethyl or trifluoromethoxy groups; and

wherein

R 3 represents a hydrogen atom or a methyl group and

R 4 represents a hydrogen atom or a (C 1 -C 3 )alkyl, (C 3 -C 5 )cycloalkyl or (pyridin-4-yl)methyl group;

n represents a number ranging from 1 to 3; or

a pharmaceutically acceptable salt thereof, optionally in combination with one or more pharmaceutically acceptable excipients, wherein said pain is associated with an inflammatory disease selected from the group consisting of arthritis, rheumatoid arthritis, osteoarthritis, spondylitis, gout, vasculitis, Crohn's disease, and irritable bowel syndrome.

5. The method according to claim 1 , wherein said compound is chosen from:

2-(methylamino)-2-oxoethyl trans-3-[5-(6-methoxynaphthalen-1-yl)-1,3-dioxan-2 -yl]propylcarbamate;

2-amino-2-oxoethyl trans-3-[5-(6-methoxynaphthalen-1-yl)-1,3-dioxan-2 -yl]propylcarbamate;

2-(methylamino)-2-oxoethyl trans-2-[5-(naphthalen-1-yl)-1,3-dioxan-2-yl]ethylcarbamate; and

2-(methylamino)-2-oxoethyl trans-3-[5-(naphthalen-1-yl)-1,3-dioxan-2-yl]propylcarbamate; or

a pharmaceutically acceptable salt thereof.

6. The method according to claim 2 , wherein said compound is chosen from:

2-(methylamino)-2-oxoethyl trans-3-[5-(6-methoxynaphthalen-1-yl)-1,3-dioxan-2 -yl]propylcarbamate;

2-amino-2-oxoethyl trans-3-[5-(6-methoxynaphthalen-1-yl)-1,3-dioxan-2 -yl]propylcarbamate;

2-(methylamino)-2-oxoethyl trans-2-[5-(naphthalen-1-yl)-1,3-dioxan-2-yl]ethylcarbamate; and

2-(methylamino)-2-oxoethyl trans-3-[5-(naphthalen-1-yl)-1,3-dioxan-2-yl]propylcarbamate; or

a pharmaceutically acceptable salt thereof.

7. The method according to claim 4 , wherein said compound is chosen from:

2-(methylamino)-2-oxoethyl trans-3-[5-(6-methoxynaphthalen-1-yl)-1,3-dioxan-2 -yl]propylcarbamate;

2-amino-2-oxoethyl trans-3-[5-(6-methoxynaphthalen-1-yl)-1,3-dioxan-2 -yl]propylcarbamate;

2-(methylamino)-2-oxoethyl trans-2-[5-(naphthalen-1-yl)-1,3-dioxan-2-yl]ethylcarbamate; and

2-(methylamino)-2-oxoethyl trans-3-[5-(naphthalen-1-yl)-1,3-dioxan-2-yl]propylcarbamate; or

a pharmaceutically acceptable salt thereof.

8. The method according to claim 3 wherein said neuropathic pain is associated with herpes virus or diabetes.