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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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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...
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Acoplamiento cruzado N-N intermolecular inducido por foto a través de la reacción de transferencia de nitreno

Subrata Das1, Hillol Khatua1, Demi D Snabilié2

  • 1Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Dr. Homi Bhabha Road, Pashan, Pune, Maharashtra 411008, India.

Journal of the American Chemical Society
|December 8, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Una nueva reacción de acoplamiento cruzado N-N inducida por la luz utiliza pirido-oxazolonas como precursores de nitreno. Este método sin metales sintetiza eficientemente hidrazidos a temperatura ambiente, útiles para el desarrollo de fármacos.

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Área de la Ciencia:

  • Química orgánica
  • La fotoquímica
  • Química medicinal

Sus antecedentes:

  • Las reacciones de acoplamiento cruzado sin metales son cruciales para sintetizar moléculas orgánicas complejas.
  • Los precursores de nitrógeno son valiosos intermedios en la síntesis orgánica.
  • La funcionalización de las moléculas bioactivas en etapa tardía sigue siendo un desafío.

Objetivo del estudio:

  • Desarrollar una nueva reacción de acoplamiento cruzado N-N intermolecular sin metales.
  • Utilización de las pirido-oxazolonas como precursores eficientes del nitreno en condiciones fotoinducidas.
  • Para establecer un protocolo simplificado para la síntesis de diversos hidrazidos.

Principales métodos:

  • Fotoactivación de las pirido-oxazolonas para generar nitrenos.
  • Acoplamiento cruzado N-N intermolecular con las anilinas N-alquilo o N-arilo.
  • Estudios mecánicos, incluidos los cálculos teóricos.

Principales resultados:

  • Reacción exitosa de acoplamiento cruzado N-N libre de metales bajo luz.
  • Síntesis de una amplia gama de hidrazidos a temperatura ambiente.
  • Demostrar la simplicidad operativa y la capacidad de funcionalidad en la fase final.

Conclusiones:

  • Las pirido-oxazolonas son precursores efectivos del nitreno para el acoplamiento cruzado N-N fotoinducido.
  • El método desarrollado ofrece una vía sintética simplificada para los hidrazidos.
  • Esta reacción tiene un potencial significativo para la química medicinal y el desarrollo de fármacos.