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-oxazine BACE1 inhibitors 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。