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Phase II Reactions: Methylation Reactions

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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
The mechanism of methylation unfolds in two stages. The first stage sees a methyltransferase enzyme facilitating the transfer of a methyl group from S-adenosylmethionine (SAM) to the substrate, forming S-adenosylhomocysteine (SAH). The second stage involves further metabolism of SAH into homocysteine, which can be recycled...
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

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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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In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
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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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Acetylation, a phase II biotransformation reaction, introduces an acetyl group to drugs or their metabolites. Acetyltransferase enzymes facilitate this reaction, which resembles α-amino acid conjugation due to the addition of a functional group to the drug molecule.
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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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Estadio tardío de la metilación oxidativa C ((sp3)) -H

Kaibo Feng1, Raundi E Quevedo1, Jeffrey T Kohrt2

  • 1Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL, USA.

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|March 18, 2020
PubMed
Resumen

Este estudio introduce un nuevo método para agregar grupos metilo a moléculas complejas, mejorando la potencia del fármaco. Esta técnica de metilación C ((sp3) -H en etapa tardía es eficiente y ampliamente aplicable en la química medicinal.

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Área de la Ciencia:

  • Química orgánica
  • Química medicinal
  • Catálisis

Sus antecedentes:

  • El "efecto metilo mágico" aumenta significativamente la potencia de las moléculas biológicamente activas mediante la adición de grupos metilo, particularmente adyacentes a los heteroátomos.
  • Los métodos de metilación existentes tienen limitaciones en su alcance y aplicabilidad a estructuras moleculares complejas, lo que dificulta el desarrollo de fármacos.

Objetivo del estudio:

  • Desarrollar un método de metilación oxidativa regioselectiva y quimioselectiva de C ((sp3) -H para la funcionalización en etapa tardía de andamios de fármacos y productos naturales.
  • Permitir una metilación eficiente y dirigida de moléculas complejas, facilitando la exploración del "efecto metilo mágico".

Principales métodos:

  • Un nuevo enfoque que combina la hidroxilación selectiva de C-H con una metilación leve tolerante al grupo funcional utilizando un catalizador de manganeso (Mn(CF3PDP)).
  • Formación de intermedios reactivos asistida por flúor o ácido de Lewis para la metilación con un reactivo de organoaluminio.
  • Aplicó el método a 41 sustratos diversos, incluidos núcleos médicamente importantes, medicamentos y productos naturales.

Principales resultados:

  • Se ha logrado una metilación selectiva del sitio en 18 moléculas farmacológicamente relevantes, incluyendo fármacos como el tedizolid y productos naturales.
  • Se ha demostrado la síntesis exitosa de dos fármacos candidatos al "metilo mágico" mediante metilación en etapa tardía.
  • Mostró la metilación remota en un análogo de abiraterona, destacando la versatilidad del método.

Conclusiones:

  • El método desarrollado ofrece una herramienta poderosa para la metilación de C ((sp3) -H en etapa tardía, compatible con andamios complejos de fármacos y productos naturales.
  • Esta técnica reduce significativamente los esfuerzos sintéticos, acelerando el descubrimiento y desarrollo de nuevas terapias y sondas químicas.
  • Amplia la aplicación del "efecto metilo mágico" en la investigación química medicinal.