Video Experimental Relacionado

Updated: Apr 15, 2026

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

Desaromatización asimétrica de los naftolos a través de una reacción de funcionalización / anulación de C (((sp2)-H

Jun Zheng¹, Shao-Bo Wang¹, Chao Zheng¹

¹State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China.

Journal of the American Chemical Society

|April 9, 2015

Resumen

Una nueva reacción catalizada por Rh crea enonas espirocíclicas quirales a partir de naftolos y alquinas. Este método de funcionalización C-H produce compuestos altamente enriquecidos con enantio con un centro estereogénico cuaternario.

Área de la Ciencia:

Química orgánica es la química orgánica.
La catálisis de la catálisis.
La síntesis estereoselectiva de síntesis.

Sus antecedentes:

Las reacciones de dearomatización son cruciales para la construcción de arquitecturas moleculares complejas.
El desarrollo de métodos enantioselectivos para la funcionalización de C-H sigue siendo un desafío significativo en la química sintética.
Los compuestos espirocíclicos con estereocentros cuaternarios son frecuentes en productos naturales y productos farmacéuticos.

Objetivo del estudio:

Desarrollar una nueva desaromatización enantioselectiva catalizada por Rh de 1-arilo-2-naftoles.
Para sintetizar enonas espirocíclicas altamente enriquecidas con enantio con un centro estereogénico cuaternario de todo carbono.
Para explorar la utilidad de la funcionalización C-H en la construcción de moléculas quirales complejas.

Principales métodos:

Empleando un catalizador quiral Cp/Rh para la reacción de dearomatización.
Utilizando una combinación de acetato de cobre (Cu (OAc) 2) y aire (oxígeno) como oxidantes.
Reaccionando 1-arilo-2-naftoles con alcinos internos bajo las condiciones catalíticas optimizadas.

Principales resultados:

Se logró con éxito la dearomatización enantioselectiva catalizada por Rh de 1-aril-2-naftoles con alquinas internas.
Sintetizó varias enonas espirocíclicas con altos rendimientos (33-98%) y excelentes enantioselectividades (hasta 97:3 er).
Demostró la formación de un centro estereogénico cuaternario de todo carbono dentro de los productos espirocíclicos.

Conclusiones:

La dearomatización catalizada por Rh desarrollada es una estrategia efectiva para la síntesis enantioselectiva.
Este método proporciona acceso a valiosas enonas espirocíclicas enriquecidas con enantio con estereocentros cuaternarios desafiantes.
El enfoque de funcionalización C-H ofrece una herramienta poderosa para la construcción de complejos andamios quirales.

Más Videos Relacionados

Preparation of N-2-alkoxyvinylsulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines

Preparation of N-2-alkoxyvinylsulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines

Published on: January 3, 2018

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

Videos de Conceptos Relacionados

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

Nucleophilic Aromatic Substitution: Addition–Elimination (S_NAr)

Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...

Nucleophilic Aromatic Substitution: Elimination–Addition

Nucleophilic Aromatic Substitution: Elimination–Addition

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...

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic S_N1

Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...

ortho–para-Directing Activators: –CH3, –OH, –&NoBreak;NH2, –OCH3

ortho–para-Directing Activators: –CH₃, –OH, –⁠NH₂, –OCH₃

All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...