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Related Concept Videos

Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

4.9K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Preparation of Amides01:29

Preparation of Amides

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Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
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Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
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Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

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Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan...
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Related Experiment Video

Updated: Apr 20, 2026

Solid Phase Synthesis of a Functionalized Bis-Peptide Using "Safety Catch" Methodology
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Solid-phase synthesis of C-terminal azapeptides.

Ngoc-Duc Doan1, Jinqiang Zhang, Mariam Traoré

  • 1Département de Chimie, Université de Montréal, C.P. 6128, Succursale Centre-Ville, Montréal, Québec, H3C 3J7, Canada.

Journal of Peptide Science : an Official Publication of the European Peptide Society
|November 18, 2014
PubMed
Summary

Solid-phase synthesis of azapeptides with a C-terminal aza-residue was achieved. This method utilizes regioselective alkylation for creating novel peptide analogs.

Keywords:
C-terminal azapeptidesacylation of semicarbazidebenzhydrylidene-protecting groupregioselective alkylation

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Area of Science:

  • Organic Chemistry
  • Peptide Chemistry
  • Medicinal Chemistry

Background:

  • Azapeptides are peptide analogs where one or more nitrogen atoms replace carbon atoms in the peptide backbone.
  • Solid-phase synthesis is a widely used technique for peptide construction.
  • C-terminal modifications can significantly alter peptide properties and biological activity.

Purpose of the Study:

  • To develop a robust solid-phase synthesis protocol for azapeptides with a C-terminal aza-residue.
  • To demonstrate the versatility of the developed protocol through the synthesis of specific peptide analogs.

Main Methods:

  • Solid-phase synthesis approach.
  • Regioselective alkylation of benzhydrylidene-aza-glycinamide as a key step.
  • Synthesis of [aza-Lys(6)] growth-hormone-releasing peptide-6 analogs as a case study.

Main Results:

  • Successful accomplishment of solid-phase synthesis for azapeptides with a C-terminal aza-residue.
  • Demonstration of regioselective alkylation for controlled synthesis.
  • Generation of novel [aza-Lys(6)] growth-hormone-releasing peptide-6 analogs.

Conclusions:

  • The developed protocol enables efficient solid-phase synthesis of azapeptides with C-terminal aza-residues.
  • This methodology provides a valuable tool for the synthesis of modified peptides with potential therapeutic applications.
  • The synthesis of specific analogs validates the protocol's utility in peptide research.