Video Experimental Relacionado
Updated: May 8, 2026
10:33
Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors
Published on: October 26, 2015
Un motivo conformacional cicloquiral construido utilizando una red robusta de enlaces de hidrógeno.
Kenji Mishiro1, Takumi Furuta, Takahiro Sasamori
1Institute for Chemical Research, Kyoto University , Uji, Kyoto, 611-0011, Japan.
Journal of the American Chemical Society
|September 7, 2013
Resumen
Los investigadores descubrieron una nueva estructura molecular con una fuerte red de enlaces de hidrógeno, creando una forma cicloquiral. Esta estructura quiral se usó para resolver alcoholes secundarios y mostró mano ajustable, ofreciendo nuevas posibilidades en el diseño molecular.
Área de la Ciencia:
- Química orgánica es la química orgánica.
- Química supramolecular de las moléculas.
- La estereoquímica es la estereoquímica.
Sus antecedentes:
- El enlace de hidrógeno intramolecular (enlace H) es crucial para la conformación molecular.
- El diseño de moléculas con propiedades quirales predecibles y controlables sigue siendo un desafío significativo en la química.
Objetivo del estudio:
- Descubrir y caracterizar un nuevo motivo conformacional impulsado por una robusta red intramolecular de enlaces H.
- Para investigar la formación de estructuras cicloquirales y su handedness.
- Para explorar la aplicación de este motivo en la síntesis asimétrica, específicamente la resolución cinética acilativa.
Principales métodos:
- Síntesis de un derivado de pirrolidina con cuatro sustituyentes de amida idénticos.
- Análisis estructural utilizando espectroscopia de Resonancia Magnética Nuclear (RMN), cristalografía de rayos X y cálculos teóricos.
- Aplicación en la resolución cinética acilativa de alcoholes secundarios.
Principales resultados:
- Un nuevo derivado de pirrolidina formó una fuerte red de enlaces H intramoleculares que involucra a todos los grupos de amida.
- Esta red indujo una estructura cicloquiral con la mano dependiente de la direccionalidad de la unión H.
- La manualidad del compuesto podría ser influenciada por sustitutos quirales y cambiada por estímulos externos.
- Se demostró la aplicación exitosa en la resolución cinética acilativa de los alcoholes secundarios.
Conclusiones:
- Se ha establecido un nuevo motivo conformacional basado en una fuerte red de enlaces H intramoleculares.
- La estructura cicloquiral descubierta exhibe una manipulación controlable, aplicable a la síntesis asimétrica.
- Este trabajo proporciona información sobre la relación entre las redes de enlace H, la conformación molecular y la quiralidad.
Videos de Conceptos Relacionados
02:11Conformations of Cyclohexane
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
02:02Chair Conformation of Cyclohexane
The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
01:18Aromatic Hydrocarbon Cations: Structural Overview
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
Removing one hydrogen from the intervening CH2 group with both...
01:22Protein Folding
Overview
01:25Protein Folding
Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
02:29Conformations of Cycloalkanes
Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3 hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that was based on the...