Synthesis of boron-containing primary amines

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Polymer Science

Background:

• Peptoids are versatile peptide mimics with applications in medicine and materials science.
• Developing efficient synthetic routes to functionalized peptoids is crucial for exploring their potential.
• Boron-containing compounds offer unique properties and reactivity for chemical synthesis.

Purpose of the Study:

• To synthesize novel boron-containing primary amines as versatile building blocks for peptoid synthesis.
• To develop a robust synthetic strategy for incorporating these boron moieties into peptoid structures.
• To explore the utility of the synthesized peptoids in cross-coupling reactions for further diversification.

Main Methods:

• Modified Gabriel synthesis for aminomethylphenyl boronate ester preparation.
• Microwave-assisted Ugi four-component reaction (Ugi-4CR) for peptoid analog construction.
• Palladium-catalyzed Suzuki coupling for post-Ugi modification of peptoid derivatives.

Main Results:

• Seven aminomethylphenyl boronate esters were synthesized in good to excellent yields.
• Boronate esters were successfully converted to corresponding boronic acids.
• Suzuki coupling of peptoid derivatives with aryl/heteroaryl chlorides yielded diverse products in moderate to good yields.

Conclusions:

• A novel synthetic route to boron-containing peptoid building blocks was established.
• The developed methodology allows for the efficient synthesis and diversification of functionalized peptoids.
• These boron-containing peptoids are valuable scaffolds for further chemical modifications and applications.