Structural optimization of aminopyrimidine-based CXCR4 antagonists

Area of Science:

• Medicinal Chemistry
• Pharmacology

Background:

• Chemokine receptor CXCR4 plays a role in various diseases.
• Developing small molecule antagonists for CXCR4 is a therapeutic strategy.

Purpose of the Study:

• To structurally optimize aminopyrimidine-based compounds as CXCR4 antagonists.
• To identify novel compounds with enhanced binding affinity and functional activity.

Main Methods:

• Molecular docking studies using CXCR4-small molecule crystal complexes.
• Structure-activity relationship analysis for optimization.
• In vitro assays to evaluate receptor binding, functional activity, and chemotaxis.

Main Results:

• Identified potent CXCR4 antagonists, with compound 23 as a key example.
• Compound 23 demonstrated high binding affinity (IC50 = 8.8 nM) and functional inhibition (IC50 = 0.02 nM).
• Compound 23 effectively inhibited chemotaxis and exhibited favorable physicochemical and in vitro safety profiles.

Conclusions:

• Structural optimization led to significant improvements in CXCR4 antagonist potency and activity.
• Compound 23 represents a promising lead compound for further optimization in drug discovery programs targeting CXCR4.