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Related Concept Videos

Preparation of Amides01:29

Preparation of Amides

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.
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Overview
Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
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Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

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.
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Phosphoramidate-peptide synthesis by solution- and solid-phase Staudinger-phosphite reactions.

Remigiusz A Serwa1, Jean-Marie Swiecicki, Denise Homann

  • 1Institut für Chemie und Biochemie, Freie Universität Berlin, Berlin, Germany.

Journal of Peptide Science : an Official Publication of the European Peptide Society
|September 24, 2010
PubMed
Summary

This study introduces efficient methods for synthesizing phosphoramidate-containing peptides using a Staudinger-phosphite reaction. These techniques allow for modifications in the middle of peptide sequences, offering new possibilities in peptide chemistry.

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Area of Science:

  • Chemical synthesis
  • Peptide chemistry
  • Organic reactions

Background:

  • Phosphoramidate moieties are important in peptide modification.
  • The Staudinger-phosphite reaction offers a route for incorporating these groups.
  • Previous methods may have limitations in scope or efficiency.

Purpose of the Study:

  • To develop efficient strategies for synthesizing phosphoramidate-containing peptides.
  • To demonstrate the Staudinger-phosphite reaction's utility on solid support and in solution.
  • To enable peptide modification at internal sites.

Main Methods:

  • Utilizing the Staudinger-phosphite reaction with aryl azido-containing peptides.
  • Performing the reaction on solid-phase synthesis supports.
  • Conducting the reaction in solution phase.

Main Results:

  • Achieved high conversion rates in Staudinger reactions.
  • Successfully synthesized phosphoramidate-containing peptides.
  • Demonstrated modification site in the middle of the peptide sequence.

Conclusions:

  • The presented strategies provide efficient synthesis of phosphoramidate peptides.
  • The Staudinger-phosphite reaction is versatile for peptide modification.
  • Internal peptide modification is feasible using these methods.