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Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
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Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Amides can undergo either acid-catalyzed hydrolysis or base-promoted hydrolysis through a typical nucleophilic acyl substitution. Each hydrolysis requires severe conditions.
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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.

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Macrociclado de péptidos lineales habilitado por moléculas anfotéricas.

Ryan Hili1, Vishal Rai, Andrei K Yudin

  • 1Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6.

Journal of the American Chemical Society
|February 17, 2010
PubMed
Resumen

La síntesis de péptidos cíclicos es un desafío. Los aminoaldehídos anfotéricos permiten una síntesis eficiente y de alto rendimiento de péptidos cíclicos a partir de precursores lineales, superando las limitaciones anteriores en la síntesis química.

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Área de la Ciencia:

  • Química orgánica es la química orgánica.
  • Química del péptido Química del péptido
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Los péptidos cíclicos son valiosos andamios para nanomateriales, agentes de imagen y terapias debido a sus conformaciones rígidas.
  • La síntesis de laboratorio tradicional de péptidos cíclicos a partir de precursores lineales se enfrenta a desafíos termodinámicos y cinéticos, lo que lleva a bajos rendimientos y poca selectividad.

Objetivo del estudio:

  • Desarrollar un método novedoso y eficiente para sintetizar péptidos cíclicos.
  • Para superar las limitaciones de los métodos de síntesis de péptidos cíclicos existentes.

Principales métodos:

  • Utilizando los aminoaldehídos anfotéricos como intermediarios clave para la ciclización.
  • Utilizando ácidos alfa-amino o péptidos lineales como materiales de partida.
  • Realización de ciclizaciones a altas concentraciones molares (0,2 M).

Principales resultados:

  • Logró una síntesis eficiente de péptidos cíclicos en altos rendimientos y selectividades.
  • No se observaron procesos laterales de epimerización o ciclodimerización.
  • Demostró la capacidad de realizar modificaciones estructurales en etapas tardías en los productos sintetizados.

Conclusiones:

  • Los aminoaldehídos anfotéricos proporcionan una estrategia efectiva para la síntesis eficiente de péptidos cíclicos.
  • El método supera los desafíos comunes en la síntesis de péptidos cíclicos, ofreciendo altos rendimientos y selectividad.
  • Los péptidos cíclicos resultantes son propensos a una mayor diversificación estructural.