| 摘要 |
The present invention relates to novel 6,7-dihydro-pyrazolo[1,5-a]pyrazin-4-yl-amine derivatives as inhibitors of beta-secretase, also known as beta-site amyloid cleaving enzyme, BACE, BACE1, Asp2, or memapsin2. 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 beta-secretase is involved, such as Alzheimer's disease (AD), mild cognitive impairment, senility, dementia, dementia with Lewy bodies, Down's syndrome, dementia associated with stroke, dementia associated with Parkinson's disease or dementia associated with beta-amyloid. |
| 主权项 |
1. A compound of Formula (I) or a tautomer or a stereoisomeric form thereof, wherein R1 and R2 are independently selected from the group consisting of hydrogen, halo, cyano, C1-3alkyl, mono- and polyhalo-C1-3alkyl or C3-6cycloalkyl; R3 is selected from the group consisting of hydrogen, C1-3alkyl, C3-6cycloalkyl, mono- and polyhalo-C1-3alkyl, homoaryl and heteroaryl; X1, X2, X3, X4 are independently C(R4) or N, provided that no more than two thereof represent N; each R4 is selected from the group consisting of hydrogen, halo, C1-3alkyl, mono- and polyhalo-C1-3alkyl, cyano, C1-3alkyloxy, mono- and polyhalo-C1-3alkyloxy; L is a bond or —N(R5)CO—, wherein R5 is hydrogen or C1-3alkyl; Ar is homoaryl or heteroaryl; wherein homoaryl is phenyl or phenyl substituted with one, two or three substituents selected from the group consisting of halo, cyano, C1-3alkyl, C1-3 alkyloxy, mono- and polyhalo-C1-3 alkyl, mono- and polyhalo-C1-3 alkyloxy; heteroaryl is selected from the group consisting of pyridyl, pyrimidyl, pyrazyl, pyridazyl, furanyl, thienyl, pyrrolyl, pyrazolyl, imidazolyl, triazolyl, thiazolyl, thiadiazolyl, oxazolyl, and oxadiazolyl, each optionally substituted with one, two or three substituents selected from the group consisting of halo, cyano, C1-3alkyl, C1-3alkyloxy, mono- and polyhalo-C1-3alkyl, mono- and polyhalo-C1-3alkyloxy; or an addition salt or a solvate thereof. |
