Pentaerythrityltetramine scaffolds for solid-phase combinatorial chemistry

Area of Science:

• Organic Chemistry
• Peptide Synthesis
• Combinatorial Chemistry

Background:

• Developing efficient methods for synthesizing branched peptides is crucial for creating diverse molecular libraries.
• Existing methods may involve complex protecting group strategies, limiting their applicability.

Purpose of the Study:

• To describe a straightforward synthesis of pentaerythrityltetramine precursors for constructing branched peptide scaffolds.
• To demonstrate the utility of these scaffolds in library synthesis.

Main Methods:

• Synthesis of two pentaerythrityltetramine precursors: 2,2-bis(azidomethyl)propane-1,3-diamine (1) and 2-[N-(allyloxycarbonyl)aminomethyl]-2-azidomethylpropane-1,3-diamine (2).
• Attachment of precursors to a solid-supported backbone amide linker via reductive amination.
• Selective acylation of amino groups and subsequent modifications, including azido group reduction and deprotection.
• Preparation of pentaerythrityl-branched tetra- and octapeptides.

Main Results:

• Successful synthesis of precursors 1 and 2.
• Demonstrated selective acylation of primary and secondary amino groups on the linker.
• Utilized precursor 2 for constructing branched structures with four different amino acids or peptides.
• Utilized solid-supported precursor 1 for constructs with two identical branches.
• Prepared 11 pentaerythrityl-branched tetra- and octapeptides, showcasing library synthesis applicability.

Conclusions:

• The described method provides a versatile and efficient approach for synthesizing branched peptides.
• The absence of acid-labile protecting groups simplifies the overall synthesis strategy.
• The developed scaffolds are suitable for combinatorial library synthesis, enabling the rapid generation of diverse peptide structures.