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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
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Nitriles to Amines: LiAlH4 Reduction00:55

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Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
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Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
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Desarrollo de catalizadores impulsados por la generalidad: un catalizador universal para la reducción de

Zihang Deng1, Melanie A Padalino1, Julius E L Jan1

  • 1Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States.

Journal of the American Chemical Society
|January 4, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Un nuevo organocatalisador ofrece una amplia aplicabilidad en la catálisis asimétrica, superando un obstáculo importante en el desarrollo de nuevos compuestos terapéuticos. Este descubrimiento proporciona una alta selectividad y generalidad para diversas moléculas pequeñas.

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Área de la Ciencia:

  • Química orgánica
  • Catalización asimétrica

Sus antecedentes:

  • La paradoja de la selectividad-generalidad dificulta la aplicación de nuevos métodos de catálisis asimétricos a diversas moléculas pequeñas.
  • Esta limitación es particularmente impactante en el desarrollo terapéutico, donde el acceso rápido a compuestos estructuralmente variados es crucial.

Objetivo del estudio:

  • Desarrollar un sistema catalítico versátil que supere la brecha entre la alta selectividad y el amplio alcance del sustrato en la catálisis asimétrica.
  • Aplicar este sistema a la síntesis de diversos péptidomiméticos.

Principales métodos:

  • Desarrollo de un nuevo organocatalisador diseñado para la catálisis enantioselectiva impulsada por la generalidad.
  • Aplicación del organocatalizador en la preparación de una serie de estructuras peptidomiméticas.

Principales resultados:

  • Un nuevo organocatalizador demostró una alta enantioselectividad y una amplia generalidad de sustrato.
  • El rendimiento del catalizador rivaliza con el de los sistemas combinados de metal y organocatalizador.
  • Esto representa un avance significativo, rompiendo un paradigma de larga data en la organocatálisis.

Conclusiones:

  • El nuevo organocatalizador proporciona un poderoso andamio para la reducción enantioselectiva.
  • El comportamiento del catalizador sugiere un nuevo mecanismo que implica el reconocimiento de un catalapilo mínimo de nitroetileno.
  • Este trabajo facilita la síntesis eficiente de diversas moléculas pequeñas para el descubrimiento de fármacos.