Derivatives of 5-pyridazinyl-1-azabicyclo[3.2.1]octane, preparation method thereof and use of same in therapeutics

A compound of formula (I):

• in which:
• R is
• either a hydrogen or halogen atom;
• or a phenyl group optionally substituted with one or more halogen atoms, or with one or more groups selected from (C1-C6)alkyl, (C1-C6)alkoxy, nitro, amino, di(C1-C3)alkylamino, trifluoromethyl, trifluoromethoxy, cyano, hydroxyl, acetyl or methylenedioxy groups;
• or a group selected from pyridinyl, pyrazolyl, imidazolyl, triazolyl, tetrazolyl, oxazolyl, thiazolyl, oxadiazolyl, thiadiazolyl, thienyl, furyl, isoxazolyl, isothiazolyl, pyrrolyl and naphthyl, it being possible for this group to be optionally substituted with one or more groups selected from halogen atoms, and (C1-C6)alkyl, (C1-C6)alkoxy, trifluoromethoxy, trifluoromethyl, nitro, cyano, hydroxyl, amino, (C1-C6)alkylamino or di(C1-C6)alkylamino groups;
• or an acid addition salt thereof, or a hydrate or a solvate thereof.