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Updated: Apr 20, 2026

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
Published on: February 9, 2021
Discovery of potent iminoheterocycle BACE1 inhibitors
John P Caldwell1, Robert D Mazzola1, James Durkin1
1Merck Research Laboratories, 2015 Galloping Hill Road, Kenilworth, NJ 07033, USA.
Abstract:
The synthesis of a series of iminoheterocycles and their structure-activity relationships (SAR) as inhibitors of the aspartyl protease BACE1 will be detailed. An effort to access the S3 subsite directly from the S1 subsite initially yielded compounds with sub-micromolar potency. A subset of compounds from this effort unexpectedly occupied a different binding site and displayed excellent BACE1 affinities. Select compounds from this subset acutely lowered Aβ40 levels upon subcutaneous and oral administration to rats.
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