Video Experimental Relacionado

Updated: Mar 9, 2026

Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

Published on: October 3, 2014

Las amidas β-carbolinas como grupos directivos intrínsecos para la funcionalización C

Hélène M-F Viart¹, Andreas Bachmann¹, William Kayitare¹

¹Department of Chemistry, University of California , Berkeley, California 94720, United States.

Journal of the American Chemical Society

|January 3, 2017

Resumen

Las amidas de beta-carbolina sirven como grupos directores intrínsecos para la funcionalización C-H catalizada por el paladio. Este método permite la δ-alquinilación selectiva del sitio y otras funcionalizaciones de C-H en condiciones suaves.

Área de la Ciencia:

Química orgánica
Catálisis
Química medicinal

Sus antecedentes:

La funcionalización C-H selectiva del sitio es crucial en la síntesis orgánica.
Muchos métodos actuales se basan en grupos de dirección externos.
El desarrollo de grupos de dirección intrínsecos simplifica las estrategias sintéticas.

Objetivo del estudio:

Introducir las amidas de β-carbolina como nuevos grupos directores intrínsecos para la funcionalización C-H.
Para explorar la utilidad de estos grupos de dirección en reacciones catalizadas por paladio.
Para demostrar la aplicación en la síntesis de moléculas complejas.

Principales métodos:

Las reacciones de funcionalización C ((sp2)-H catalizadas por el paladio.
Utilizando las amidas de β-carbolina como grupos de dirección.
Las reacciones de alquinilación, alquenilación, arylación y formación de enlaces C-N.

Principales resultados:

Las amidas de β-carbolina dirigen efectivamente la funcionalización δ-C ((sp2) -H.
Funcionalización exitosa de productos naturales como la alangiobussinina y los núcleos de marinacarbolina.
Condiciones de reacción leves y amplio alcance del sustrato con las β-ariletaminas.
Se ha demostrado la selectividad de la δ-alquinilación sobre la funcionalización γ-C(sp2)-H.
La versatilidad se muestra a través de la alquenilación, la arilación y la formación de enlaces C-N.

Conclusiones:

Las amidas de β-carbolina son grupos directores intrínsecos efectivos para la funcionalización selectiva del sitio C-H.
Este enfoque ofrece una ruta versátil y eficiente a las carbolinas funcionales y estructuras relacionadas.
La metodología es aplicable a la síntesis de moléculas complejas y al descubrimiento de fármacos.

Más Videos Relacionados

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Published on: June 20, 2014

Videos de Conceptos Relacionados

Carbocations

Carbocations

Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...

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...

Radicals: Electronic Structure and Geometry

Radicals: Electronic Structure and Geometry

This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...

meta-Directing Deactivators: –NO2, –CN, –CHO, –&NoBreak;CO2R, –COR, –CO2H

meta-Directing Deactivators: –NO₂, –CN, –CHO, –⁠CO₂R, –COR, –CO₂H

All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...

π Molecular Orbitals of 1,3-Butadiene

π Molecular Orbitals of 1,3-Butadiene

Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...

Directing Effect of Substituents: meta-Directing Groups

Directing Effect of Substituents: meta-Directing Groups

Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...