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Nitrosation of Enols01:19

Nitrosation of Enols

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The nitrosation reaction is one of the methods of preparing 1,2-diketones. The enol tautomer of the starting ketone reacts with sodium nitrite in hydrochloric acid, generating the 1,2-diketone after hydrolysis.
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Preparation of Epoxides03:00

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Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of...
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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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Preparation of Nitriles01:12

Preparation of Nitriles

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One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
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Inserción de nitrógeno oxidativo en los enolos silílicos de éter CC

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Los investigadores descubrieron una nueva forma de insertar nitrógeno en las moléculas utilizando éteres de sililenoles y una especie similar al iodonitreno. Este método crea valiosos agentes alquilantes alfa-amido para la síntesis de moléculas complejas y la funcionalización en etapa tardía.

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Área de la Ciencia:

  • Química orgánica
  • Metodología sintética
  • Descubrimiento de la reacción

Sus antecedentes:

  • Los éteres de sililenoles son versátiles bloques de construcción nucleófilos en la síntesis orgánica.
  • El desarrollo de nuevos métodos para la inserción de nitrógeno en marcos orgánicos sigue siendo un desafío clave.
  • Los métodos existentes a menudo carecen de regioselectividad o requieren condiciones duras.

Objetivo del estudio:

  • Introducir una nueva reactividad de éteres de silileno con la inserción de átomos de nitrógeno.
  • Desarrollar un método fácil y eficiente para la síntesis de agentes alquilantes alfa-amido.
  • Para permitir la funcionalización y modificación de moléculas orgánicas complejas.

Principales métodos:

  • Utilizando una especie similar al iodonitreno generada in situ para reaccionar con éteres de sililenoles.
  • Investigando el mecanismo de inserción de nitrógeno y la escisión del enlace C=C.
  • Correlación de la eficiencia de la reacción con la nucleofilicidad de los éteres de silileno utilizando la escala de Mayr N.

Principales resultados:

  • Una nueva transformación que inserta un átomo de nitrógeno entre los carbonos olefínicos de éteres de enol de silicio.
  • Conversión de éteres sililenoles nucleófilos C a N-acil-N,O-acetales electrófilos C.
  • Se ha demostrado la derivación modular de los acetalos resultantes con varios nucleófilos.
  • Inserción exitosa de nitrógeno en etapa tardía en esqueletos de productos naturales con alta regioselectividad.

Conclusiones:

  • Este trabajo presenta un método sin precedentes para acceder a los agentes alquilantes alfa-amido.
  • La metodología desarrollada ofrece una herramienta poderosa para la edición del marco de carbono en etapa tardía.
  • La reacción es eficiente y su alcance es predecible basado en la nucleofilicidad del éter enol.
  • Las aplicaciones incluyen el etiquetado selectivo 15N de amidas y lactamas.