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Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems01:19

Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems

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Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body.
Oxidation reactions are fundamental in aromatic carbon-containing systems. An example is the hydroxylation of phenobarbital, a process that transforms it into...
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Basicity of Aliphatic Amines01:21

Basicity of Aliphatic Amines

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Amines can behave as Brønsted–Lowry bases by accepting a proton from the acid to form corresponding conjugate acids. Due to a lone pair of nonbonding electrons, aliphatic amines can also act as Lewis bases by forming a covalent bond with an electrophile.
To measure the basicity of amines, two conventions are generally used. The first defines Kb as the basicity constant for the deprotonation reaction of water by the amine, as presented in Figure 1. Conventionally, lower Kb indicates higher...
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Oxidation Numbers03:14

Oxidation Numbers

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In redox reactions, the transfer of electrons occurs between reacting species. Electron transfer is described by a hypothetical number called the oxidation number (or oxidation state). It represents the effective charge of an atom or element, which is assigned using a set of rules.
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Pyruvate Oxidation01:15

Pyruvate Oxidation

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After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...
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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Stages of Infection01:26

Stages of Infection

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Stages of infection describe what happens to a susceptible host once a pathogen invades the human body. The stages of infection are incubation, prodromal, illness, stage of decline, and convalescence. The incubation stage is the period from exposure to a pathogen until symptoms start. The infected person is unaware of impending illness as the pathogens grow and multiply within the body. The duration may vary depending on the type of infection. The incubation period of measles averages ten to...
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Updated: Feb 5, 2026

Mouse Fetal Liver Culture System to Dissect Target Gene Functions at the Early and Late Stages of Terminal Erythropoiesis
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Oxidaciones alifáticas de C-H para la funcionalización en etapa tardía

M Christina White1, Jinpeng Zhao1

  • 1Roger Adams Laboratory, Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.

Journal of the American Chemical Society
|September 7, 2018
PubMed
Resumen

Las reacciones de oxidación C-H no dirigidas permiten a los químicos modificar moléculas complejas en nuevos sitios. El ajuste del catalizador permite un control preciso de la oxidación, avanzando en las estrategias de funcionalización de última etapa.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Metodología sintética

Sus antecedentes:

  • La síntesis tradicional se basa en las características moleculares existentes para la funcionalidad.
  • La oxidación dirigida C-H extiende esta lógica, pero está limitada por la estructura del sustrato.
  • La oxidación C-H no dirigida ofrece una mayor flexibilidad sintética.

Objetivo del estudio:

  • Proporcionar una perspectiva histórica sobre los desafíos de la oxidación selectiva de C-H.
  • Para resaltar el descubrimiento y el impacto de la catálisis de hidroxilación no dirigida de C-H.
  • Demostrar el control de la selectividad del sitio a través del diseño del catalizador.

Principales métodos:

  • Revisión de las estrategias históricas de oxidación C-H.
  • Discusión de las hidroxilaciones alifáticas no dirigidas de C-H catalizadas por Fe (PDP).
  • Análisis de los factores electrónicos, estéricos y estéreoelectrónicos que influyen en la selectividad del sitio.

Principales resultados:

  • Demostró que los enlaces alifáticos C-H pueden oxidarse selectivamente sin dirigir grupos.
  • Reglas establecidas para predecir y controlar la selectividad del sitio en la oxidación C-H.
  • Se muestra la sintonización del catalizador (por ejemplo, Fe ((CF3-PDP)) para alterar el sitio de oxidación.

Conclusiones:

  • El desarrollo de la oxidación C-H no dirigida ha revolucionado la química sintética.
  • El control preciso de la selectividad del sitio se puede lograr mediante la modificación del catalizador.
  • Permite la funcionalización en etapa tardía para una diversificación eficiente de las moléculas.