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Ketones with Nonenolizable Aromatic Aldehydes: Claisen–Schmidt Condensation01:01

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Benzaldehyde, like formaldehyde, lacks an α hydrogen and cannot enolize to form an enolate. Hence, the reaction of benzaldehyde with a ketone in the presence of an aqueous base forms a single crossed product. This reaction is referred to as Claisen–Schmidt condensation.
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Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral...
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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
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Summary
This summary is machine-generated.

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.

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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.