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Alkylation of β-Diester Enolates: Malonic Ester Synthesis01:14

Alkylation of β-Diester Enolates: Malonic Ester Synthesis

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Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
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Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis01:07

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Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an...
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Acid-Catalyzed α-Halogenation of Aldehydes and Ketones01:21

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By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
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α-Alkylation of Ketones via Enolate Ions01:10

α-Alkylation of Ketones via Enolate Ions

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Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...
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Esters to β-Ketoesters: Claisen Condensation Mechanism01:08

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Regular Claisen condensation involves the synthesis of β-ketoesters by combining identical ester molecules bearing two α hydrogens in the presence of an alkoxide base. The reaction commences with the deprotonation of the acidic α hydrogen by the base to form a resonance stabilized ester enolate. This nucleophilic ion then attacks the carbonyl center of another ester molecule to generate a tetrahedral alkoxide intermediate. Next, the expulsion of the alkoxide group from the...
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[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement01:24

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The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
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Lactamización C(sp2)-H impulsada por CO2 a 2-quinolinonas

Hong Sun1, Duanyang Kong1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing Key Laboratory of Intelligent Design and Manufacturing for Hydrogen Energy Materials, Beijing University of Chemical Technology, Beijing 100029, China.

Organic letters
|February 23, 2026
PubMed
Resumen

Este estudio presenta un método nuevo y sin metales para sintetizar 2-quinolinonas utilizando dióxido de carbono (CO2) y azido-alquenos. Este enfoque sostenible ofrece una excelente tolerancia a grupos funcionales y permite la creación de importantes bloques de construcción farmacéuticos.

Palabras clave:
lactamización2-quinolinonasCO2síntesis sin metalesquímica sosteniblequímica medicinal

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Área de la Ciencia:

  • Química Orgánica
  • Química Medicinal
  • Síntesis Sostenible

Sus antecedentes:

  • Las 2-quinolinonas son motivos estructurales cruciales en muchos agentes farmacéuticos.
  • Los métodos sintéticos actuales para las 2-quinolinonas a menudo requieren condiciones duras o metales de transición, lo que plantea desafíos de sostenibilidad.

Objetivo del estudio:

  • Desarrollar una ruta sintética novedosa y sin metales de transición para las 2-quinolinonas.
  • Utilizar dióxido de carbono (CO2) como fuente sostenible de un carbono en síntesis orgánica.
  • Lograr la síntesis suave y eficiente de diversas 2-quinolinonas con amplia tolerancia a grupos funcionales.

Principales métodos:

  • Se empleó una reacción de lactamización C(sp2)-H sin metales de transición de azido-alquenos.
  • Se utilizó dimetil fenilfosfonito como reactivo clave en condiciones de reacción suaves.
  • El dióxido de carbono (CO2) sirvió como fuente de un carbono para la lactamización.

Principales resultados:

  • El método desarrollado sintetizó con éxito diversas 2-quinolinonas con altos rendimientos y excelente tolerancia a grupos funcionales.
  • La reacción demostró una eficiente marcación con 13C con una incorporación del 99%, facilitando estudios isotópicos.
  • Se logró la síntesis a escala de gramos, destacando la aplicabilidad práctica del método.
  • Las 2-quinolinonas sintetizadas fueron susceptibles a posteriores funcionalizaciones posteriores.

Conclusiones:

  • Este estudio presenta una alternativa versátil y sostenible a los métodos convencionales y catalizados por metales para la síntesis de 2-quinolinonas.
  • El enfoque sin metales de transición ofrece ventajas significativas en términos de condiciones suaves, tolerancia a grupos funcionales y escalabilidad.
  • La metodología proporciona acceso a una amplia gama de derivados de 2-quinolinona biológicamente relevantes para aplicaciones farmacéuticas.