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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.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...

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Facile Protocol for the Synthesis of Self-assembling Polyamine-based Peptide Amphiphiles (PPAs) and Related Biomaterials
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An amine-derivatized, DOTA-loaded polymeric support for Fmoc Solid Phase Peptide Synthesis.

Byunghee Yoo1, Vipul R Sheth, Mark D Pagel

  • 1Biomedical Engineering Interdisciplinary Program, The University of Arizona, Tucson AZ.

Tetrahedron Letters
|February 18, 2010
PubMed
Summary

A new method uses amine-derivatized DOTA for solid-phase peptide synthesis (SPPS) to create peptide-DOTA conjugates. These conjugates act as PARACEST MRI contrast agents, advancing molecular imaging development.

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Area of Science:

  • Chemical Synthesis
  • Molecular Imaging
  • Bioconjugation

Background:

  • Solid Phase Peptide Synthesis (SPPS) is crucial for creating peptides.
  • Developing effective contrast agents for Magnetic Resonance Imaging (MRI) is an ongoing challenge.
  • DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid) is a common chelator for metal ions used in contrast agents.

Purpose of the Study:

  • To develop a novel synthesis methodology for peptide-DOTA conjugates.
  • To adapt standard Fmoc SPPS for the creation of molecular imaging contrast agents.
  • To demonstrate the utility of the synthesized peptide-DOTA conjugate as a PARACEST MRI contrast agent.

Main Methods:

  • Modification of a polymeric support surface with an amine-derivatized DOTA.
  • Application of standard Fmoc (N-fluorenylmethoxycarbonyl) chemistry for solid-phase peptide synthesis.
  • Characterization of the synthesized peptide-DOTA conjugate.

Main Results:

  • Successful synthesis of a peptide-DOTA conjugate using the modified SPPS method.
  • Demonstration of the synthesized conjugate as a PARACEST (Paramagnetic Chemical Exchange Saturation Transfer) MRI contrast agent.
  • Validation of the amine-derivatized DOTA-modified support for Fmoc SPPS.

Conclusions:

  • The developed synthesis methodology effectively facilitates Fmoc SPPS of peptide-DOTA conjugates.
  • This approach provides a viable route for creating novel PARACEST MRI contrast agents.
  • The study advances the field of molecular imaging by enabling the synthesis of targeted contrast agents.