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Videos de Conceptos Relacionados

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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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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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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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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Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
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Regioselectivity and Stereochemistry of Hydroboration02:36

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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

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Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Hidroamidación regioselectiva catalizada por NiH de alquenos no activados con dioxazolonas

Dong-Jie Li1, Hai-Yang Hu1, Bai-Qun Ruan1

  • 1College of Chemistry and Materials Science, Sichuan Normal University, 5 Jingan Road, Chengdu 610068, People's Republic of China.

The Journal of organic chemistry
|August 25, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Una nueva reacción catalizada por níquel sintetiza eficientemente derivados de aminoácidos de alquenos y dioxazolonas. Este método es altamente selectivo, tolera varios grupos funcionales y evita ligandos adicionales, lo que resulta útil en aplicaciones farmacéuticas.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Metodología sintética

Sus antecedentes:

  • Los derivados de aminoácidos son bloques de construcción cruciales en los productos farmacéuticos y la ciencia de los materiales.
  • Las rutas sintéticas existentes a menudo requieren condiciones duras o procedimientos complejos.

Objetivo del estudio:

  • Desarrollar un método eficiente y suave para la síntesis de derivados de los aminoácidos β y γ.
  • Para explorar una nueva reacción de hidroamidación intermolecular catalizada por níquel.

Principales métodos:

  • Hidroamidación intermolecular catalizada por níquel de alquenos mediante el uso de dioxazolonas.
  • El empleo de un grupo de dirección para controlar la selectividad regional.
  • Optimización de las condiciones de reacción para la suavidad y la eficiencia.

Principales resultados:

  • Síntesis exitosa de valiosos derivados de los aminoácidos β y γ.
  • Se logró una alta regioselectividad y una excelente tolerancia funcional del grupo.
  • La reacción se produjo en condiciones suaves sin necesidad de ligandos adicionales.
  • Escalabilidad y aplicabilidad demostradas en la funcionalización de las moléculas de fármacos en etapa tardía.

Conclusiones:

  • Se ha establecido una nueva, eficiente y práctica hidroamidación catalizada por níquel de alquenos.
  • Esta metodología ofrece una herramienta valiosa para acceder a diversos derivados de aminoácidos.
  • El enfoque muestra un potencial significativo para la síntesis y el desarrollo farmacéuticos.