Abstract: The present invention relates to novel 1-aryl-4-methyl-[1,2,4]triazolo[4,3-a]-quinoxaline derivatives as inhibitors of phosphodiesterase 2 (PDE2) and to a lesser extent of phosphodiesterase 10 (PDE10) or as inhibitors of both, phosphodiesterases 2 and 10. The invention is also directed to pharmaceutical compositions comprising such compounds, to processes for preparing such compounds and compositions, and to the use of such compounds and compositions for the prevention and treatment of disorders in which PDE2 is involved, or disorders in which both PDE2 and PDE10 are involved, such as neurological and psychiatric disorders, and endocrinological or metabolic diseases. The present invention also relates to radiolabelled compounds which may be useful for imaging and quantifying the PDE2 enzyme in tissues, using positron-emission tomography (PET).

Abstract: The present invention relates to combinations of phosphodiesterase 2 (PDE2) inhibitors with inhibitors of phosphodiesterase 10 (PDE10). In particular, the invention relates to combinations of 1-aryl-4-methyl-[1,2,4]triazolo[4,3-a]-quinoxaline derivatives which have been found to inhibit phosphodiesterase 2 (PDE2), with inhibitors of phosphodiesterase 10 (PDE10). Particular PDE10 inhibitors are selected from the group of MP-10, PQ-10, TP-10, papaverine, and the compounds disclosed in WO 2011/051324 and in WO 2011/110545.

Abstract: The present invention relates to novel imidazo[1,2-a]pyrazine derivatives which are inhibitors of the phosphodiesterase 10 enzyme (PDE10) and which are useful for the treatment or prevention of neurological, psychiatric and metabolic disorders in which the PDE10 enzyme is involved. The invention is also directed to pharmaceutical compositions comprising such compounds, to processes to prepare such compounds and compositions, to the use of such compounds or pharmaceutical compositions for the prevention or treatment of neurological, psychiatric and metabolic disorders and diseases.

Abstract: The present invention relates to novel 1-aryl-4-methyl-[1,2,4]triazolo[4,3-a]-quinoxaline derivatives as inhibitors of phosphodiesterase 2 (PDE2) and to a lesser extent of phosphodiesterase 10 (PDE10) or as inhibitors of both, phosphodiesterases 2 and 10. The invention is also directed to pharmaceutical compositions comprising such compounds, to processes for preparing such compounds and compositions, and to the use of such compounds and compositions for the prevention and treatment of disorders in which PDE2 is involved, or disorders in which both PDE2 and PDE 10 are involved, such as neurological and psychiatric disorders, and endocrinological or metabolic diseases. The present invention also relates to radiolabelled compounds which may be useful for imaging and quantifying the PDE2 enzyme in tissues, using positron-emission tomography (PET).

Abstract: The present invention relates to novel imidazo[1,2-b]pyridazine derivatives which are inhibitors of the phosphodiesterase 10 enzyme (PDE10) and which are useful for the treatment or prevention of neurological, psychiatric and metabolic disorders in which the PDE10 enzyme is involved. The invention is also directed to pharmaceutical compositions comprising such compounds, to processes to prepare such compounds and compositions, to the use of such compounds or pharmaceutical compositions for the prevention or treatment of neurological, psychiatric and metabolic disorders and diseases.

Abstract: The present invention relates to novel imidazo[1,2-a]pyrazine derivatives which are inhibitors of the phosphodiesterase 10 enzyme (PDE10) and which are useful for the treatment or prevention of neurological, psychiatric and metabolic disorders in which the PDE10 enzyme is involved. The invention is also directed to pharmaceutical compositions comprising such compounds, to processes to prepare such compounds and compositions, to the use of such compounds or pharmaceutical compositions for the prevention or treatment of neurological, psychiatric and metabolic disorders and diseases.

Abstract: The present invention relates to novel imidazo[1,2-b]pyridazine derivatives which are inhibitors of the phosphodiesterase 10 enzyme (PDE10) and which are useful for the treatment or prevention of neurological, psychiatric and metabolic disorders in which the PDE10 enzyme is involved. The invention is also directed to pharmaceutical compositions comprising such compounds, to processes to prepare such compounds and compositions, to the use of such compounds or pharmaceutical compositions for the prevention or treatment of neurological, psychiatric and metabolic disorders and diseases.

Abstract: The present invention relates to novel imidazo[1,2-b]pyridazine derivatives which are inhibitors of the phosphodiesterase 10 enzyme (PDE10) and which are useful for the treatment or prevention of neurological, psychiatric and metabolic disorders in which the PDE10 enzyme is involved. The invention is also directed to pharmaceutical compositions comprising such compounds, to processes to prepare such compounds and compositions, to the use of such compounds or pharmaceutical compositions for the prevention or treatment of neurological, psychiatric and metabolic disorders and diseases.

Abstract: the N-oxide forms, the pharmaceutically acceptable addition salts and the stereochemically isomeric forms thereof, wherein n represents an integer being 1 or 2; R1 and R2 each independently represents hydrogen C1-4alkyl, NR9R10, C1-4alkyloxy; or R1 and R2 taken together with the carbon atom with which they are attached form a C3-6cycloalkyl; and where n is 2, either R1 or R2 may be absent to form an unsaturated bond; R3 represents a C6-12cycloalkyl, preferably selected from cylo-octanyl and cyclohexyl or R3 represents a monovalent radical having one of the following formulae ?wherein said C6-12cycloalkyl or monovalent radical may optionally be substituted with one, or where possible two, three or more substituents selected from the group consisting of C1-4alkyl, C1-4alkyloxy, halo or hydroxy; Q represents Het1 or Ar2 wherein said C3-8cycloalkyl, Het1 or Ar2 are optionally substituted with one or where possible two or more substituents selected from halo, C1-4alkyl, C1-4alkyloxy, hydroxy, nitro, NR5R

Abstract: the N-oxide forms, the pharmaceutically acceptable addition salts and the stereochemically isomeric forms thereof, wherein n represents an integer being 1 or 2; R1 and R2 each independently represents hydrogen C1-4alkyl, NR9R10, C1-4alkyloxy; or R1 and R2 taken together with the carbon atom with which they are attached form a C3-6cycloalkyl; and where n is 2, either R1 or R2 may be absent to form an unsaturated bond; R3 represents a C6-12cycloalkyl, preferably selected from cylo-octanyl and cyclohexyl or R3 represents a monovalent radical having one of the following formulae wherein said C6-12cycloalkyl or monovalent radical may optionally be substituted with one, or where possible two, three or more substituents selected from the group consisting of C1-4alkyl, C1-4alkyloxy, halo or hydroxy; Q represents Het1 or Ar2 wherein said C3-8cycloalkyl, Het1 or Ar2 are optionally substituted with one or where possible two or more substituents selected from halo, C1-4alkyl, C1-4alkyloxy, hydroxy, nitro, NR5R6