Video Experimental Relacionado
Updated: Jun 3, 2025
06:46
Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
7.3K
Aminoalquilación de alquenos habilitada por la clasificación de radicales triples
William L Lyon1, Johnny Z Wang1, Jesús Alcázar2
1Merck Center for Catalysis at Princeton University, Princeton, New Jersey 08544, United States.
Journal of the American Chemical Society
|January 9, 2025
Resumen
Los investigadores desarrollaron una nueva reacción de tres componentes para sintetizar moléculas complejas ricas en C ((sp3) a partir de alquenos simples. Este método innovador utiliza la catálisis fotorredóxica y la clasificación de radicales triples para una aminoalquilación eficiente, creando bloques de construcción farmacéuticos valiosos.
Área de la Ciencia:
- Química orgánica sintética
- Catálisis
- Química medicinal
Sus antecedentes:
- La síntesis directa de arquitecturas ricas en C ((sp3) es crucial para el desarrollo de nuevos fármacos.
- Estos andamios mejoran las propiedades del fármaco y el éxito clínico.
- El acceso a moléculas ricas en sp3 a partir de materias primas fácilmente disponibles como los alquenos es un desafío clave.
Objetivo del estudio:
- Para desarrollar una nueva reacción de aminoalquilación de tres componentes.
- Para permitir la adición de radicales regioselectivos a través de alquenos.
- Para crear vías eficientes hacia andamios moleculares ricos en sp3.
Principales métodos:
- Utilizó la catálisis fotorredóxica para la generación de radicales.
- Se han empleado principios de clasificación por radicales triples para la selectividad regional.
- Desarrolló una reacción de tres componentes que involucra alquenos, radicales centrados en N y centrados en C.
Principales resultados:
- Se demostró una nueva reacción de aminoalquilación de tres componentes.
- Se logró la adición regioselectiva de radicales centrados en N y C a través de alquenos.
- Muestra una amplia gama de socios de acoplamiento y aplicaciones sintéticas.
Conclusiones:
- El método desarrollado proporciona un acceso eficiente a moléculas ricas en sp3.
- Facilita la síntesis de los heterociclos N sustituidos farmacológicamente.
- Ofrece una nueva herramienta valiosa para la química orgánica sintética y el descubrimiento de medicamentos.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:16Radical Reactivity: Nucleophilic Radicals
2.0K
Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
2.0K
01:27Radical Substitution: Allylic Bromination
5.0K
In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...
5.0K
01:25Radical Anti-Markovnikov Addition to Alkenes: Overview
3.3K
The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
3.3K
01:17Radical Anti-Markovnikov Addition to Alkenes: Mechanism
3.6K
The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
The mechanism starts with chain initiation, which involves two steps. In the first chain initiation step, a weak peroxide bond is homolytically cleaved upon mild heating to form two alkoxy radicals. In the second initiation step, a hydrogen atom is abstracted by the alkoxy...
The mechanism starts with chain initiation, which involves two steps. In the first chain initiation step, a weak peroxide bond is homolytically cleaved upon mild heating to form two alkoxy radicals. In the second initiation step, a hydrogen atom is abstracted by the alkoxy...
3.6K
02:10Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia
9.1K
Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone.
When dissolved in liquid ammonia, an alkali metal,...
When dissolved in liquid ammonia, an alkali metal,...
9.1K
01:02Radical Reactivity: Electrophilic Radicals
1.8K
Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
1.8K