Video Experimental Relacionado
Updated: Jul 5, 2026
09:45
Modification and Functionalization of the Guanidine Group by Tailor-made Precursors
Published on: April 27, 2017
Síntesis total de (+) -forboxazol A explotando el reordenamiento de Petasis y Ferrier
A B Smith1, K P Minbiole, P R Verhoest
1Department of Chemistry, Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, PA 19104, USA.
Journal of the American Chemical Society
|November 1, 2001
Resumen
Se logró una nueva síntesis total de (+) -forboxazol A, un potente agente antiproliferativo. Esta investigación detalla las estrategias sintéticas clave y su aplicación exitosa en la construcción de esta compleja molécula.
Área de la Ciencia:
- Química orgánica es la química orgánica.
- Química sintética de la química sintética.
- Química Medicinal La Química Medicinal es un campo de estudio de la química medicinal.
Sus antecedentes:
- El potente agente antiproliferativo (+) -forboxazol A es un producto natural complejo.
- Desarrollar rutas sintéticas eficientes para tales moléculas es crucial para una mayor evaluación biológica y el descubrimiento de fármacos.
Objetivo del estudio:
- Para lograr una síntesis total altamente convergente y estereocontrolada de (+) -forboxazol A.
- Explorar nuevas metodologías sintéticas aplicables a la construcción de moléculas complejas.
Principales métodos:
- Utilizó reordenamientos modificados de Petasis-Ferrier para el ensamblaje de anillos de cis-tetrahidropirano.
- Empleó la olefinación de Julia para la síntesis de éter enol y desarrolló un nuevo eje central de oxazol.
- Acoplamiento Stille incorporado para el ensamblaje final del fragmento.
Principales resultados:
- Con éxito sintetizó (+) -forboxazol A con una secuencia lineal más larga de 27 pasos.
- Logró un rendimiento general del 3% para la síntesis total.
- Demostró la utilidad de nuevas estrategias sintéticas en la síntesis de moléculas complejas.
Conclusiones:
- Se ha establecido con éxito una síntesis total estereocontrolada y altamente convergente de (+) -forboxazol A.
- La ruta sintética desarrollada muestra aplicaciones innovadoras de reacciones orgánicas clave.
- Esta síntesis proporciona una base para futuros estudios sobre los agentes antiproliferativos.
Videos de Conceptos Relacionados
02:54Coordination Compounds and Nomenclature
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
01:09Conjugate Addition to α,β-Unsaturated Carbonyl Compounds
α,β-Unsaturated carbonyl compounds are molecules bearing a carbonyl and alkene functionality in conjugation with each other. The conjugation in the molecule leads to three resonance structures. The hybrid form exhibits two probable electrophilic sites: the carbonyl carbon and the β carbon.
01:11Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene
The Friedel–Crafts acylation reactions involve the addition of an acyl group to an aromatic ring. These reactions proceed via electrophilic aromatic substitution by employing an acyl chloride and a Lewis acid catalyst such as aluminum chloride to form aryl ketone.
01:07Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview
In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
01:27Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)
α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon.
Direct addition products are formed faster owing to...
Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon.
Direct addition products are formed faster owing to...
01:26EDTA: Auxiliary Complexing Reagents
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...