Video Experimental Relacionado
Updated: Jun 10, 2026
10:10
Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes
Published on: July 28, 2018
Difluorobenzocyclooctyne: síntesis, reactividad y estabilización por la beta-ciclodextrina
Ellen M Sletten1, Hitomi Nakamura, John C Jewett
1Department of Chemistry, University of California, Berkeley, California 94720, USA.
Journal of the American Chemical Society
|July 30, 2010
Resumen
Una nueva difluorobenzocicloctina (DIFBO) demuestra una mayor reactividad para la química de clic libre de cobre. La complejación beta-ciclodextrina estabiliza DIFBO, lo que permite su uso en aplicaciones biológicas.
Área de la Ciencia:
- Química orgánica es la química orgánica.
- Biología Química Biología química.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Las cicloctinas altamente reactivas son cruciales para las reacciones de cicloadición sin cobre con azidas en entornos biológicos.
- Las estrategias para mejorar la reactividad de la ciclooctina incluyen la reducción de LUMO a través de la fluoración y la mejora de la tensión a través de anillos de arilo fundidos.
Objetivo del estudio:
- Para sintetizar y caracterizar una nueva difluorobenzocicloctina (DIFBO) que combina la reducción de LUMO y la mejora de la deformación.
- Investigar la estabilización y la utilidad de DIFBO utilizando la complejación beta-ciclodextrina para aplicaciones biológicas.
Principales métodos:
- Fácil síntesis de difluorobenzocicloctina (DIFBO).
- Caracterización de los productos de trimización espontánea de DIFBO utilizando cristalografía de rayos X.
- Formación y disociación de un complejo de inclusión beta-ciclodextrina-DIFBO.
- Análisis cinético y espectroscópico de la reacción de cicloadición de DIFBO con azidas.
Principales resultados:
- DIFBO exhibe una alta reactividad, trimerizando espontáneamente después de la síntesis.
- La beta-ciclodextrina estabiliza con éxito el DIFBO en medios acuosos como un polvo liofilizado.
- La disociación del complejo da DIFBO libre para el análisis in situ.
- DIFBO muestra una constante de tasa de cicloadición más alta con azidas en comparación con DIFO y DIBO.
Conclusiones:
- La complejación beta-ciclodextrina es una estrategia eficaz para estabilizar las cicloctinas altamente reactivas.
- Este enfoque facilita la aplicación de ciclooctinas potentes en la química de clic sin cobre.
- DIFBO representa un reactivo prometedor para estudios avanzados de bioconjugación y biología química.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:13Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene
Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
01:16Cycloaddition Reactions: Overview
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
02:30Stability of Substituted Cyclohexanes
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
01:18Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
01:13Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization
Dieckmann cyclization is an intramolecular Claisen condensation of diesters. The reaction occurs in the presence of a base and generates a cyclic β-ketoester as the final product. Commonly, 1, 6 and 1, 7-diesters are preferred substrates for the reaction since the generated five, and six-membered cyclic β-keto esters are particularly more stable.
01:14Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene
Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.