2

1. A compound corresponding to the formula (I)

in which

W represents an oxygen or sulphur atom;

X 1 , X 2 , X 3 and X 4 each represent, independently of one another, a hydrogen or halogen atom or a cyano, C 1 -C 6 -alkyl, C 1 -C 6 -fluoroalkyl, C 1 -C 6 -alkoxy or C 1 -C 6 fluoroalkoxy group;

Y is in the (N2) or (N3) position;

when Y is in the (N2) position, Y represents a C 1 -C 6 -alkyl, C 1 -C 6 -fluoroalkyl, aryl or heteroaryl group;

when Y is in the (N3) position, Y represents an aryl or heteroaryl group;

the aryl or heteroaryl groups optionally being substituted by one or more atoms or groups selected from halogen atoms and C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkylthio, C 1 -C 6 -alkyl-S(O)—, C 1 -C 6 -alkyl-S(O) 2 — and C 1 -C 6 -fluoroalkyl groups;

the bond in the C4-C5 position is a double or single bond;

R 1 and R 2 each represent, independently of one another, an aryl, benzyl or C 1 -C 6 -alkyl group; or else R 1 and R 2 form, with the nitrogen atom to which they are attached, a heterocycle optionally substituted by one or more C 1 -C 6 -alkyl or benzyl groups;

in the form of the base or of an addition salt with an acid, and in the hydrate or solvate form.

2. A compound according to claim 1 , wherein:

W represents an oxygen or sulphur atom;

X 1 , X 2 and X 3 each represent, independently of one another, a hydrogen atom, a halogen atom, a cyano group, a C 1 -C 6 -alkyl group or a C 1 -C 6 -alkoxy group;

X 4 represents a hydrogen atom;

Y is in the (N2) or (N3) position;

when Y is in the (N2) position, Y represents a C 1 -C 6 -alkyl group, a C 1 -C 6 -fluoroalkyl group, an aryl group or a heteroaryl group;

when Y is in the (N3) position, Y represents an aryl group or a heteroaryl group;

the aryl or heteroaryl groups optionally being substituted by one or more atoms or groups selected from halogen atoms, C 1 -C 6 -alkyl groups and C 1 -C 6 -alkoxy groups;

the bond in the C4-C5 position is a double or single bond;

R 1 and R 2 each represent, independently of one another, an aryl group or a C 1 -C 6 -alkyl group; or else R 1 and R 2 form, with the nitrogen atom to which they are attached, a heterocycle optionally substituted by one or two C 1 -C 6 -alkyl groups;

in the form of the base or of an addition salt with an acid, and in the hydrate or solvate form.

3. A compound according to claim 1 , wherein:

W represents an oxygen or sulphur atom;

X 1 , X 2 and X 3 each represent, independently of one another, a hydrogen atom, a halogen atom, a C 1 -C 6 -alkyl group or a C 1 -C 6 -alkoxy group;

X 4 represents a hydrogen atom;

Y is in the (N2) or (N3) position and represents an aryl group or a heteroaryl group;

the aryl or heteroaryl groups optionally being substituted by one or more atoms or groups selected from halogen atoms, C 1 -C 6 -alkyl groups and C 1 -C 6 -alkoxy groups;

the bond in the C4-C5 position is a double or single bond;

R 1 and R 2 each represent, independently of one another, an aryl group or a C 1 -C 6 -alkyl group; or else R 1 and R 2 form, with the nitrogen atom to which they are attached, a heterocycle optionally substituted by one or two C 1 -C 6 -alkyl groups;

in the form of the base or of an addition salt with an acid, and in the hydrate or solvate form.

4. A compound according to claim 1 , wherein:

W represents an oxygen or sulphur atom;

X 1 , X 2 and X 3 each represent, independently of one another, a hydrogen atom, a halogen atom, a C 1 -C 6 -alkyl group or a C 1 -C 6 -alkoxy group;

X 4 represents a hydrogen atom;

Y is in the (N3) position and represents an aryl group or a heteroaryl group;

the aryl or heteroaryl groups optionally being substituted by one or more atoms or groups selected from halogen atoms, C 1 -C 6 -alkyl groups and C 1 -C 6 -alkoxy groups;

the bond in the C4-C5 position is a double or single bond;

R 1 and R 2 each represent, independently of one another, an aryl group or a C 1 -C 6 -alkyl group; or else R 1 and R 2 form, with the nitrogen atom to which they are attached, a heterocycle optionally substituted by one or two C 1 -C 6 -alkyl groups;

in the form of the base or of an addition salt with an acid, and in the hydrate or solvate form.

5. A process for the preparation of a compound of formula (I) as defined in claim 1 , which comprises:

reacting a mixture composed of the positional isomers of general formulae (Va) and (Vb),

 in which X 1 , X 2 , X 3 , X 4 and Y are as defined in the general formula (I) according to claim 1 and in which the Y group is, respectively, in the (N2) position and in the (N3) position of the pyrazole ring, with a carbamoyl chloride derivative of general formula ClC(W)NR 1 R 2 , in which W, R 1 and R 2 are as defined in the general formula (I) according to claim 1 , in the presence of a base, to obtain, after separation, the compounds of general formulae (Ia) and (Ib),

 the single bond in the C4-C5 position subsequently being optionally dehydrogenated to form a double bond.

6. A process for the preparation of a compound of formula (Ia)

in which

W represents an oxygen or sulphur atom;

X 1 , X 2 , X 3 and X 4 each represent, independently of one another, a hydrogen or halogen atom or a cyano, C 1 -C 6 -alkyl, C 1 -C 6 -fluoroalkyl, C 1 -C 6 -alkoxy or C 1 -C 6 -fluoroalkoxy group;

Y is in the (N2) position and represents a C 1 -C 6 -alkyl, C 1 -C 6 -fluoroalkyl, aryl or heteroaryl group;

the aryl or heteroaryl groups optionally being substituted by one or more atoms or groups chosen from halogen atoms or C 1 -C 6 -alkyl, C 1 -C 6 -alkoxy, C 1 -C 6 -alkylthio, C 1 -C 6 -alkyl-S(O)—, C 1 -C 6 -alkyl-S(O) 2 — or C 1 -C 6 -fluoroalkyl groups;

the bond in the C4-C5 position is a double or single bond;

R 1 and R 2 each represent, independently of one another, an aryl, benzyl or C 1 -C 6 -alkyl group; or else R 1 and R 2 form, with the nitrogen atom to which they are attached, a heterocycle optionally substituted by a C 1 -C 6 -alkyl or benzyl group;

Which comprises reacting a compound of general formula (Va),

 in which X 1 , X 2 , X 3 , X 4 and Y are as defined in the general formula (Ia) above, with a carbamoyl chloride derivative of general formula ClC(W)NR 1 R 2 , in which W, R 1 and R 2 are as defined in the general formula (Ia) above, in the presence of a base, the single bond in the C4-C5 position subsequently being optionally dehydrogenated to form a double bond.

7. A pharmaceutical composition, which comprises a compound of formula (I) according to claim 1 , or a pharmaceutically acceptable salt, a hydrate or a solvate of this compound, and at least one pharmaceutically acceptable excipient.