Liquid phase parallel synthesis of guanidines

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Polymer Chemistry

Background:

• Guanidines are important pharmacophores found in numerous biologically active molecules.
• Developing efficient and versatile synthetic routes to guanidine derivatives is crucial for drug discovery.
• Existing methods for guanidine synthesis can be limited in scope or require harsh conditions.

Purpose of the Study:

• To develop a combinatorial liquid-phase synthesis strategy for N,N'-di(Boc)-protected guanidines.
• To investigate the reactivity of guanylation reagents with polymer-supported diamines.
• To establish a method for the efficient and high-purity liberation of guanidines from a solid support.

Main Methods:

• Combinatorial synthesis utilizing soluble polymer-bound diamines.
• Reaction of polymer-bound diamines with various guanylation reagents in liquid phase.
• Purification of synthesized guanidines via precipitation and washing post-cleavage from the polymer support.

Main Results:

• Successful development of a combinatorial synthesis for N,N'-di(Boc)-protected guanidines incorporating piperazine and pyrrolidine scaffolds.
• Demonstration of high yields and purity for guanidines liberated from the polymer support under mild conditions.
• Preliminary study on the reactivity of guanylation reagents with polymer-bound diamines was initiated.

Conclusions:

• The developed combinatorial liquid-phase methodology is an effective tool for constructing diverse guanidine libraries.
• This approach offers a mild, efficient, and scalable route to high-purity guanidine derivatives.
• The method facilitates the exploration of chemical space for guanidine-containing compounds in medicinal chemistry.