Video Experimental Relacionado

Updated: Apr 7, 2026

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Published on: November 9, 2019

Catalitic Dual 1,1-H-Abstraction/Insertion para las espirociclaciones Domino

Jiang-Kai Qiu^1,2, Bo Jiang¹, Yi-Long Zhu^1,2

¹†School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, 221116, P. R. China.

Journal of the American Chemical Society

|July 2, 2015

Resumen

Una nueva reacción de espirociclado de dominó catalítico sintetiza de manera eficiente las espirociclopenta[c]quinolinas. Este método utiliza 1,7-eninas y cicloalcanes, formando múltiples enlaces carbono-carbono a través de la activación C-H.

Área de la Ciencia:

Química orgánica es la química orgánica.
La catálisis de la catálisis.
Metodología sintética de la metodología sintética.

Sus antecedentes:

Las reacciones de dominó ofrecen rutas sintéticas eficientes al realizar múltiples transformaciones secuencialmente en un solo recipiente.
Los compuestos espirocíclicos poseen estructuras tridimensionales únicas con aplicaciones en química medicinal y ciencias de los materiales.
El desarrollo de nuevos métodos catalíticos para la construcción de espirociclos complejos sigue siendo un desafío importante en la síntesis orgánica.

Objetivo del estudio:

Para establecer una reacción catalítica de espirociclado de dominó para la síntesis de espirociclopenta[c]quinolinas.
Explorar el uso de cicloalcanos simples y ciclo-1,3-dicarbonilos como socios de acoplamiento.
Desarrollar un método conciso y eficiente para acceder a valiosos andamios espirocíclicos.

Principales métodos:

La reacción emplea un sistema catalítico para mediar la espirociclado dominó de 1,7-eninas.
Los pasos clave incluyen múltiples formaciones de enlaces C-C a través de las funciones alquinila/alquenila y la doble abstracción/inserción α,α-C(sp(3)) -H.
El proceso implica adición, ciclización de 6 exo dígitos y secuencias de acoplamiento radical.

Principales resultados:

Se estableció con éxito una nueva espirociclado de dominó catalítico de 1,7-eninas con cicloalcanos y ciclo-1,3-dicarbonilos.
La reacción procede a través de una cascada de formaciones de enlaces y funcionalización C-H.
Las quinolinas de Spiro cyclopenta[c] se sintetizaron con rendimientos de buenos a excelentes bajo condiciones catalíticas convenientes.

Conclusiones:

La desarrollada espirociclado domino catalítico desarrollado proporciona una ruta concisa y eficiente a spiro cyclopenta[c]quinolines.
Esta metodología ofrece una poderosa herramienta para la construcción de complejas arquitecturas espirocíclicas.
La reacción pone de relieve la utilidad de la activación de C-H en procesos en cascada para la eficiencia sintética.

Más Videos Relacionados

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

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

Published on: February 7, 2019

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

Published on: May 26, 2019

Videos de Conceptos Relacionados

Regioselectivity and Stereochemistry of Hydroboration

Regioselectivity and Stereochemistry of Hydroboration

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 stereochemistry.

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

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.

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.

Radical Chain-Growth Polymerization: Chain Branching

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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