Derivatives of 6-cycloamino-2-thienyl-3- (pyridin-4-yl) imidazo ° 1,2-b! Pyridazine and 6-cycloamino-2-furanyl-3- (pyridin-4-yl) -imidazo 1 2-b! pyridazine, their preparation and their therapeutic application

The invention relates to derivatives of 6-cycloamino-2-thienyl-3- (pyridin-4-yl) imidazo [1,2-b] pyridazine, and 6-cycloamino-2-furanyl-3- (pyridin-4- yl) imidazo [1,2-b] pyridazine of general formula (I): wherein R is thienyl or furanyl, optionally substituted by one or more substituents selected from halogen atoms and alkyl groups C; R represents a hydrogen atom or a C alkyl group, -NR R, hydroxy or C alkyloxy; A is C alkylene optionally substituted by one or two R groups; B is C alkylene optionally substituted with an R group; L represents either a nitrogen atom optionally substituted with an R or R group, or a carbon atom substituted by an R group and an R group or two groups R; Process for the preparation and therapeutic application.