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Videos de Conceptos Relacionados

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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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α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.
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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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Amines to Alkenes: Hofmann Elimination01:16

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Alkenes can be obtained from amines via an E2 elimination. The amine is first converted into a good leaving group, such as a quaternary ammonium salt. This is accomplished by treating the amine with an excess of alkyl halide, which results in a halide salt. Next, the halide salt is transformed into a hydroxide salt that functions as a base to enable elimination.
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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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Radical Anti-Markovnikov Addition to Alkenes: Overview01:25

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The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
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Updated: Jun 7, 2025

Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Hidroformilación reductora asimétrica catalizada por el rodio de las enamidas α-sustituidas

Yuxin Zhu1, Yuchen Zhang2, Dongyang He1

  • 1State Key Laboratory of Chemical Biology, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai 200032, China.

Journal of the American Chemical Society
|November 21, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Una nueva reacción catalizada por el rodio crea eficientemente alcoholes quirales de 1,3-amino de las enamidas. Este método proporciona compuestos enantioméricamente enriquecidos, cruciales para los productos farmacéuticos, en un solo paso.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Química medicinal

Sus antecedentes:

  • Los γ-aminoalcoholes quirales son componentes esenciales de los productos naturales y farmacéuticos.
  • Las rutas sintéticas existentes a menudo carecen de eficiencia y economía atómica para los alcoholes γ-amino enriquecidos enantioméricamente.

Objetivo del estudio:

  • Desarrollar un método altamente enantioselectivo y económico para la síntesis de alcoholes quirales de 1,3-amino.
  • Establecer una transformación de un solo paso a partir de las enamidas α sustituidas fácilmente disponibles.

Principales métodos:

  • Hidroformilación reductora catalizada por el rodio de las enamidas α-sustituidas.
  • Desarrollo de un nuevo ligando BIBOP sustituido por 4,4'-bisarilamino (TFPNH-BIBOP).
  • Utilizando cálculos DFT y datos experimentales para comprender los mecanismos de reacción.

Principales resultados:

  • Síntesis exitosa de varios alcoholes quirales 1,3-amino de valor farmacéutico en buenos rendimientos y enantioselectividades excelentes.
  • Demostró el papel crucial del ligando TFPNH-BIBOP en el logro de una alta enantioselectividad.
  • Interacciones de enlace de hidrógeno identificadas como factores clave para la reactividad y la selectividad.

Conclusiones:

  • La hidroformilación reductora catalizada por rodio desarrollada es un método eficiente y enantioselectivo para la síntesis quiral de alcohol 1,3-amino.
  • Este enfoque ofrece una ruta concisa a valiosos intermediarios farmacéuticos, incluido un intermediario clave para maraviroc.