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Videos de Conceptos Relacionados

Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

5.7K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
5.7K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.9K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.9K
Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

8.1K
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
8.1K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

6.6K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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Video Experimental Relacionado

Updated: Apr 15, 2026

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

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Enfoque fácil de cicloadición neta a las 1,5-benzotiazepinas ópticamente activas.

Yukihiro Fukata1, Keisuke Asano1, Seijiro Matsubara1

  • 1Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo, Kyoto 615-8510, Japan.

Journal of the American Chemical Society
|April 10, 2015
PubMed
Resumen

Los investigadores desarrollaron un método de cicloadición novedoso y altamente enantioselectivo para sintetizar 1,5-benzothiazepines. Este avance permite la producción eficiente de compuestos ópticamente activos para el descubrimiento de fármacos y la investigación de antagonismo de enfermedades.

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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
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Área de la Ciencia:

  • Química orgánica es la química orgánica.
  • Química Medicinal La Química Medicinal es el campo de la Química Medicinal.
  • Síntesis asimétrica de síntesis.

Sus antecedentes:

  • Los derivados de la 1,5-benzotiazepina son farmacóforos reconocidos con potenciales aplicaciones terapéuticas.
  • El desarrollo de rutas sintéticas enantioselectivas para estos compuestos es crucial para el desarrollo de fármacos.
  • Los métodos sintéticos existentes carecen de protocolos enantioselectivos eficientes para las 1,5-benzotiazepinas.

Objetivo del estudio:

  • Establecer el primer protocolo de cicloadición enantioselectiva para la síntesis de las 1,5-benzotiazepinas.
  • Para permitir la preparación fácil de una amplia gama de derivados ópticamente activos de la 1,5-benzotiazepina.
  • Proporcionar un método escalable para generar bibliotecas compuestas para la evaluación biológica.

Principales métodos:

  • Utilizamos catalizadores quirales de isotiourea para generar productos intermedios de acilamonio α,β insaturados.
  • Empleó una estrategia de adición de ciclo neta [4 + 3].
  • Logró dos ataques nucleófilos quimioselectivos secuenciales por 2-aminotiofenoles.

Principales resultados:

  • Se han sintetizado con éxito 1,5-benzotiazepinas con alta regioselectividad.
  • Se ha demostrado una estereoselectividad de buena a excelente en varios sustratos.
  • Estableció una nueva y eficiente ruta sintética para las 1,5-benzotiazepinas ópticamente activas.

Conclusiones:

  • El protocolo desarrollado representa el primer cicloadición neta [4 + 3] altamente enantioselectiva para las 1,5-benzothiazepinas.
  • Este método ofrece una plataforma versátil para construir diversas bibliotecas de 1,5-benzotiazepinas ópticamente activas.
  • Los hallazgos proporcionan una prometedora estrategia sintética para futuros esfuerzos de descubrimiento de fármacos dirigidos a enfermedades.