Video Experimental Relacionado
Updated: Jan 5, 2026
08:56
Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
Published on: November 30, 2022
3.3K
Instalación de tetrazinas mínimas mediante el acoplamiento Liebeskind-Srogl mediado por plata con ácidos
William D Lambert1, Yinzhi Fang1, Subham Mahapatra2
1Department of Chemistry and Biochemistry , University of Delaware , Newark , Delaware 19716 , United States.
Journal of the American Chemical Society
|October 12, 2019
Resumen
Un nuevo método de acoplamiento cruzado mediado por plata permite la unión directa de grupos mínimos de tetrazina a moléculas complejas, evitando así los enlaces y mejorando la seguridad. Este enfoque mejora las aplicaciones de química bioortogonal y el desarrollo de sondas.
Área de la Ciencia:
- Química orgánica
- Química bioortogonal
- Química medicinal
Sus antecedentes:
- La fijación de tetrazinas bioortogonales a moléculas complejas a menudo requiere enlaces, que pueden afectar negativamente las propiedades fisicoquímicas.
- Los métodos convencionales para la instalación de tetrazina pueden incluir reactivos y subproductos peligrosos.
Objetivo del estudio:
- Desarrollar un nuevo método libre de enlaces para instalar grupos mínimos de tetrazina en moléculas complejas.
- Mejorar la seguridad y eficiencia de la síntesis y aplicación de la tetrazina.
Principales métodos:
- Se empleó una reacción de acoplamiento de Liebeskind-Srogl mediada por plata utilizando un nuevo reactivo, 3-((p-bifenil-4-metil) tio) -6-metiltetrazina (b-Tz).
- La reacción fue catalizada por PdCl2 ((dppf) en condiciones suaves.
- El nuevo reactivo (b-Tz) fue diseñado para una preparación segura y escalable sin hidrazina.
Principales resultados:
- El acoplamiento cruzado mediado por Ag introdujo con éxito una funcionalidad mínima de 6-metiltetrazinyl libre de enlaces en varios ácidos borónicos de arilo y heteroarilo con rendimientos más altos en comparación con los métodos tradicionales.
- Se sintetizó un conjugado fluorogénico de tetrazina y BODIPY, demostrando un mejor acceso.
- Se creó una sonda covalente para la MAGL (lipasa monoacilglicerol) y se utilizó para etiquetar la MAGL endógena en células vivas.
Conclusiones:
- El método de acoplamiento cruzado mediado por Ag desarrollado proporciona una vía versátil y más segura para instalar directamente subunidades de tetrazina en moléculas complejas.
- Se espera que este enfoque avance la química bioortogonal, la biología química y el descubrimiento de fármacos al permitir la creación de nuevos conjugados y sondas.
Videos de Conceptos Relacionados
01:14Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1
2.6K
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,...
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
2.6K
01:20Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions
2.4K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
2.4K
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
3.5K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
3.5K
01:11Nucleophilic Aromatic Substitution: Elimination–Addition
5.0K
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...
5.0K
01:20Electrophilic Aromatic Substitution: Nitration of Benzene
8.0K
The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
8.0K
01:30Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)
4.6K
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...
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...
4.6K