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Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
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Esters are reduced to primary alcohols when treated with a strong reducing agent like lithium aluminum hydride. The reaction requires two equivalents of the reducing agent and proceeds via an aldehyde intermediate.
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The reaction of an ester with a Grignard reagent, followed by hydrolysis of the magnesium alkoxide salt in aqueous acid, yields a tertiary alcohol. In the case of formate esters, secondary alcohols are formed.
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Reducción parcial desimétrica de los ésteres malónicos

Pengwei Xu1, Shihao Liu1, Zhongxing Huang1

  • 1State Key Laboratory of Synthetic Chemistry, Department of Chemistry, The University of Hong Kong, Hong Kong 00000, China.

Journal of the American Chemical Society
|April 7, 2022
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Resumen

Los investigadores desarrollaron un nuevo método catalizado por zinc para la reducción asimétrica de ésteres malónicos, obteniendo aldehídos valiosos. Este avance proporciona una ruta selectiva a las moléculas complejas con estereocentros cuaternarios.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis asimétrica
  • Metodología sintética

Sus antecedentes:

  • Los estereocentros cuaternarios son motivos cruciales en muchas moléculas bioactivas.
  • Los métodos existentes para la desimetrización a menudo producen alcoholes, lo que limita las transformaciones sintéticas adicionales.
  • Es muy deseable desarrollar métodos selectivos para obtener aldehídos a partir de ésteres malónicos.

Objetivo del estudio:

  • Informar de las nuevas condiciones para la hidrociliación asimétrica catalizada por zinc de los ésteres malónicos.
  • Para lograr una reducción selectiva a aldehídos, en lugar de alcoholes.
  • Para permitir la síntesis de diversos compuestos que contienen estereocentros cuaternarios.

Principales métodos:

  • Se utilizó la catálisis de zinc para la hidrociliación desimétrica de ésteres malónicos disueltos.
  • Se han empleado nuevos ligandos tetradentados derivados del pipecolinol.
  • Condiciones de reacción optimizadas, incluidas mayores concentraciones de silano, para favorecer la formación de aldehídos.

Principales resultados:

  • Se obtienen altos rendimientos de aldehídos como el principal producto de varios ésteres malónicos sustituidos.
  • Se obtienen altas relaciones aldehído-alcohol y una excelente enantioselectividad para los aldehídos.
  • Demostró la utilidad del método en la síntesis de compuestos bioactivos y productos naturales.

Conclusiones:

  • El método desarrollado ofrece un enfoque potente y selectivo para acceder a los aldehídos mediante la reducción parcial de los ésteres malónicos.
  • Esta estrategia proporciona un acceso eficiente a bloques de construcción quirales valiosos con estereocentros cuaternarios.
  • La metodología expande el conjunto de herramientas sintéticas para la construcción de moléculas orgánicas complejas.