A compound that responds to formula (I): in which: represents a single or double bond, X represents -N <；, -CH <；or Y represents>； N- or>； CH-, it being understood that at least one of X, Y represents N； Ar represents an aryl or heteroaryl group optionally substituted with one or more substituents, identical or different, chosen from halogen atoms, the C1-C6 alkyl, C1-C6 halogenoalkyl, C1-C3 perhalogenoalkyl, C1-C6 alkoxy, C1-C6 alhaloxy groups -C3, aryl； R1 represents a hydrogen atom or a C1-C6 alkyl group, -C (>； = O) -C1-C6 alkyl or -C (>； = O) -aryl； R2, R3 and R4, identical or different, located in any of the available positions of the phenyl core, independently represent a hydrogen atom, a halogen atom, CN, OH, a C1-C6 alkyl group optionally substituted with an atom halogen or an OH； C1-C3 perhaloalkyl, C1-6 alkoxy, C1-C3 perhaloalkoxy, aminocarbonyl, C1-C6-aminocarbonyl alkyl, C1-C6 dialkyl-aminocarbonyl, aryl, aryloxy heteroaryl； the aryl, aryloxy or heteroaryl group may optionally be substituted with a halogen atom, CN, OH or a C1-C6 alkyl, C1-C3 perhaloalkyl or C1-C6 alkoxy group； it being understood that at least one of R2, R3 and R4 is different from H and that the aryl, aryloxy or heteroaryl group may eventually be substituted with a halogen atom, CN, OH or a C1-C6 alkyl group, C1-C3 perhaloalkyl or C1-C6 alkoxy； R5 represents a C1-C6 alkyl or C2-C6 alkenyl group； and n represents 1 or 2； in the form of a base or an acid addition salt； with the exception of 5-chloro-3- (2-chlorophenyl) -1, 3-dihydro-3- [2- (425 methylpiperacin-1-yl) acetamido] indole-2-one.Un compuesto que responde a la fórmula (I) : en la que : representa un enlace sencillo o doble, X representa -N<；, -CH<； o Y representa >；N- o >；CH-, entendiéndose que al menos uno de X, Y representa N ； Ar representa un grupo arilo o heteroarilo sustituido opcionalmente con uno o varios sustituyentes, idénticos o diferentes, elegidos entre los átomos de halógeno, los grupos alquil
