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Aldehyde Capture Ligation without Involving a Side Chain Functional Group
Junfeng Zhao1,2, Zhenjia Zhang2, Yongsheng Yang1,3
1School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore.
Organic Letters
|November 4, 2025
Summary
A novel peptide ligation method utilizes an aldehyde capture strategy for general peptide synthesis. This approach enables the formation of native peptide bonds, independent of side-chain functional groups.
Area of Science:
- Organic Chemistry
- Chemical Biology
- Synthetic Chemistry
Background:
- Peptide synthesis is crucial for drug discovery and biochemical research.
- Existing peptide ligation methods often face limitations regarding functional group compatibility and efficiency.
- Developing general and robust peptide ligation strategies remains an active area of research.
Purpose of the Study:
- To develop a general aldehyde capture peptide ligation method.
- To achieve native peptide bond formation independent of side-chain functional groups.
- To demonstrate the broad applicability of the developed ligation strategy.
Main Methods:
- Condensation of a salicylaldehyde group with an N-terminal amine.
- In situ formation of a 1,2,5-oxadiazinane ring facilitated by an N-hydroxyl auxiliary group.
- O,N-acyl transfer to form a tertiary amide linkage.
- Reductive cleavage using SmI2 to yield a native peptide.
Main Results:
- A novel peptide ligation method was successfully developed.
- The method allows for peptide ligation independent of side-chain functional groups.
- The N-hydroxyl auxiliary group provides a general ligation junction.
- The method was exemplified by a broad range of peptide substrates.
Conclusions:
- The developed aldehyde capture peptide ligation method is general and efficient.
- This method offers a valuable tool for synthesizing peptides with native linkages.
- The strategy broadens the scope of accessible peptide structures for various applications.
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