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Discovery of amino-1,4-oxazines as potent BACE-1 inhibitors
Siem Jakob Veenstra1, Heinrich Rueeger1, Markus Voegtle1
1Department of Global Discovery Chemistry, Novartis Institutes for BioMedical Research, Novartis Pharma AG, CH-4057 Basel, Switzerland.
Abstract:
New amino-1,4-oxazine derived BACE-1 inhibitors were explored and various synthetic routes developed. The binding mode of the inhibitors was elucidated by co-crystallization of 4 with BACE-1 and X-ray analysis. Subsequent optimization led to inhibitors with low double digit nanomolar activity in a biochemical and single digit nanomolar potency in a cellular assays. To assess the inhibitors for their permeation properties and potential to cross the blood-brain-barrier a MDR1-MDCK cell model was successfully applied. Compound 8a confirmed the in vitro results by dose-dependently reducing Aβ levels in mice in an acute treatment regimen.
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