Synthesis of a Complex and Highly Potent PCSK9 Inhibitor.

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Drug Discovery

Background:

• Proprotein convertase subtilisin-like/kexin type 9 (PCSK9) is a key regulator of cholesterol metabolism.
• Inhibitors of PCSK9 are crucial for managing hypercholesterolemia.
• Efficient synthesis of complex PCSK9 inhibitors is essential for therapeutic development.

Purpose of the Study:

• To develop a scalable, solution-based synthesis for a complex PCSK9 inhibitor.
• To construct a highly potent PCSK9 inhibitor (compound 1) with potential therapeutic applications.

Main Methods:

• Modular synthesis strategy involving Northern (2), Eastern (3), Southern (4), and Western (5) fragments.
• Intramolecular azide-alkyne click reaction for macrocyclic precursor formation (19).
• Macrolactamization and subsequent coupling with a poly(ethylene glycol) side chain (6).

Main Results:

• Successful gram-scale synthesis of the complex PCSK9 inhibitor 1.
• Demonstrated stepwise assembly of molecular fragments leading to the final compound.
• Efficient macrocyclization via click chemistry and macrolactamization.

Conclusions:

• The presented synthetic route provides a viable method for large-scale production of potent PCSK9 inhibitors.
• This approach facilitates the development of novel therapeutics for cholesterol management.
• The modular strategy and click chemistry integration offer versatility for synthesizing related compounds.