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Tunable Methacrylamides for Covalent Ligand Directed Release Chemistry.

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Researchers developed α-substituted methacrylamides, a novel class of electrophiles for targeted covalent inhibitors. These compounds offer tunable reactivity and enable the creation of "turn-on" probes for drug discovery and chemical biology applications.

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Area of Science:

  • Medicinal Chemistry
  • Chemical Biology
  • Drug Discovery

Background:

  • Targeted covalent inhibitors are crucial for drug development and chemical probes.
  • A limited number of electrophiles are suitable for designing effective covalent inhibitors.
  • Existing acrylamide electrophiles can lack desired reactivity or selectivity profiles.

Purpose of the Study:

  • To introduce α-substituted methacrylamides as a new class of electrophiles for targeted covalent inhibitors.
  • To investigate the reactivity and tunability of these novel electrophiles.
  • To demonstrate their application in developing 'turn-on' probes and facilitating drug discovery screens.

Main Methods:

  • Synthesis and characterization of hetero α-substituted methacrylamides.
  • Evaluation of thiol reactivity and correlation with leaving group properties (pKa/pKb).
  • Application in modified ibrutinib analogs for protein labeling, kinase assays, and cellular assays.
  • Development of covalent ligand-directed release (CoLDR) turn-on probes (fluorescent and chemiluminescent).

Main Results:

  • Hetero α-substituted methacrylamides exhibit tunable thiol reactivity via a conjugate addition-elimination mechanism.
  • Modified ibrutinib analogs demonstrated comparable potency with improved selectivity.
  • CoLDR probes were successfully developed for BTK, EGFR, and K-RasG12C.
  • A BTK CoLDR chemiluminescent probe facilitated a high-throughput screen for inhibitors.

Conclusions:

  • α-substituted methacrylamides represent a versatile new platform for targeted covalent inhibitor design.
  • Their tunable reactivity and ability to form 'turn-on' probes enhance their utility in chemical biology.
  • This approach offers improved selectivity and enables novel screening strategies for drug discovery.