Abstract
We have reported potent peptidic and non-peptidic BACE1 inhibitors with a hydroxymethylcarbonyl (HMC) isostere as a substrate transition-state mimic. However, our potent inhibitors possess a tetrazole ring at the P1′ position. It is desirable that central nervous system (CNS) drugs do not possess an acidic moiety. In this study, we synthesized non-acidic BACE1 inhibitors with heterocyclic derivatives at the P1′ position. KMI-1764 (27) exhibited potent inhibitory activity (IC50=27nM). Interestingly, these non-acidic inhibitors tended to follow the quantitative structure–activity relationship (QSAR) equation and interacted with BACE1-Arg235 in the binding model.
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