The present invention relates to novel 5-(3-aminophenyl)-5-alkyl-5,6-dihydro-2H-[1,4]oxazin-3-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, cerebral amyloid angiopathy, multi-infarct dementia, Down's syndrome, dementia associated with stroke, dementia associated with Parkinson's disease and dementia associated with beta-amyloid.
Optimization of 1,4-Oxazine β-Secretase 1 (BACE1) Inhibitors Toward a Clinical Candidate
作者:Harrie J. M. Gijsen、Sergio A. Alonso de Diego、Michel De Cleyn、Aránzazu García-Molina、Gregor J. Macdonald、Carolina Martínez-Lamenca、Daniel Oehlrich、Hana Prokopcova、Frederik J. R. Rombouts、Michel Surkyn、Andrés A. Trabanco、Sven Van Brandt、Dries Van den Bossche、Michiel Van Gool、Nigel Austin、Herman Borghys、Deborah Dhuyvetter、Diederik Moechars
DOI:10.1021/acs.jmedchem.8b00304
日期:2018.6.28
the introduction of electron withdrawing groups to 1,4-oxazineBACE1inhibitors reduced the pKa of the amidine group, resulting in compound 2 that showed excellent in vivo efficacy, lowering Aβ levels in brain and CSF. However, a suboptimal cardiovascular safety margin, based on QTc prolongation, prevented further progression. Further optimization resulted in the replacement of the 2-fluoro substituent
在先前的研究中,将吸电子基团引入1,4-恶嗪BACE1抑制剂可降低am基团的p K a,从而使化合物2表现出出色的体内功效,降低大脑和CSF中的Aβ水平。但是,基于QTc延长的次优心血管安全裕度阻止了进一步的进展。进一步的优化导致CF 3-基团取代了2-氟取代基,从而降低了hERG抑制作用。这导致化合物3的心血管安全性得到改善,并且在GLP毒性研究中足够安全,可以进入临床试验。