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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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By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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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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Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...
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Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
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Una hidrolactonización asimétrica catalítica

Rajat Maji1, Santanu Ghosh1, Oleg Grossmann1

  • 1Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany.

Journal of the American Chemical Society
|April 12, 2023
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Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un método de hidrolactonización asimétrico catalítico utilizando un nuevo catalizador de ácido Brønsted de imidodifosforimidato (IDPi). Este avance aborda un desafío de larga data en la síntesis orgánica, permitiendo reacciones eficientes y escalables.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Síntesis asimétrica

Sus antecedentes:

  • Las reacciones de lactonización inducidas por electrófilos son cruciales en la síntesis orgánica.
  • La hidrolactonización asimétrica catalítica de los ácidos carboxílicos olefínicos sigue siendo un desafío importante.
  • Los métodos anteriores tienen limitaciones en el alcance y la eficiencia.

Objetivo del estudio:

  • Desarrollar un nuevo método catalítico de hidrolactonización asimétrica.
  • Para abordar el desafío de larga data de la hidrolactonización arquetípica.
  • Para proporcionar una ruta sintética escalable y versátil.

Principales métodos:

  • Se utilizó un catalizador de ácido de Brønsted de imidodifosforimato confinado (IDPi).
  • Se utilizan ácidos olefínicos carboxílicos como sustratos.
  • Se llevaron a cabo estudios mecanicistas detallados utilizando análisis físicoquímicos y DFT.

Principales resultados:

  • Se ha logrado con éxito la hidrolactonización asimétrica catalítica.
  • Simplicidad operativa demostrada, escalabilidad y amplia compatibilidad con el sustrato.
  • Demostró la utilidad del método a través de la síntesis de (-) -boivinianina A y (+) -gossonorol.

Conclusiones:

  • El catalizador de ácido Brønsted IDPi desarrollado permite efectivamente la hidrolactonización asimétrica.
  • Este método ofrece un enfoque práctico y eficiente para sintetizar moléculas complejas.
  • Las ideas mecanicistas proporcionan una comprensión más profunda de la enantioselectividad de la reacción.