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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
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Hidrogenación por transferencia asimétrica catalítica de acilboronatos: BMIDA como el grupo directivo privilegiado

Xiangjian Meng1,2, Shouang Lan1, Ting Chen1

  • 1State Key Laboratory of Structural Chemistry, and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China.

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Este estudio introduce un nuevo método catalítico para la síntesis de alcoholes quirales utilizando la hidrogenación por transferencia asimétrica (ATH) de los acilboronatos de N-metilminodiacetilo (MIDA). Este enfoque proporciona una vía versátil para los alcoholes secundarios enriquecidos con enantio y los compuestos relacionados.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Síntesis asimétrica

Sus antecedentes:

  • El desarrollo de métodos generales, eficientes y enantioselectivos para la síntesis de alcohol quiral sigue siendo un desafío significativo en la química orgánica.
  • Los métodos de hidrogenación asimétrica existentes a menudo tienen dificultades para lograr altas enantioselectividades para ciertas clases de sustratos, lo que limita la accesibilidad sintética.

Objetivo del estudio:

  • Establecer un método catalítico general e independiente del sustrato para la síntesis enantioselectiva de alcoholes quirales.
  • Explorar la utilidad de los acilboronatos de N-metilminodiacetilo (MIDA) como sustratos versátiles en la hidrogenación por transferencia asimétrica (ATH).

Principales métodos:

  • Hidrogenación asimétrica por transferencia (ATH) de acilboronatos de N-metilminodiacetilo (MIDA) mediante el uso de un sistema catalizador de Noyori-Ikariya.
  • Síntesis de álcoholes α-borilo enriquecidos con enantio con diversos sustituyentes (arilo, alquilo, alquinylo, alquenilo, carbonilo).
  • Transformaciones estereospecíficas de álcoholes α-borilo utilizando la fracción de boro.
  • Estudios computacionales para elucidar el mecanismo de la enantioselectividad.

Principales resultados:

  • Desarrollo exitoso de un método general de ATH para los acilboronatos MIDA, que permite obtener una amplia gama de alcoholes secundarios enriquecidos con enantio.
  • Se demostró la síntesis de carbinolos con dos α-sustitutos estrechamente relacionados, superando las limitaciones de la hidrogenación asimétrica directa.
  • Se identificó al grupo BMIDA como un grupo de dirección de enantioselectividad superior en comparación con los grupos arilo y alquinilo tradicionales en ATH.
  • El análisis computacional reveló interacciones electrostáticas CH-O favorables que contribuyen a la capacidad de dirección del grupo BMIDA.

Conclusiones:

  • El ATH reportado de los acilboronatos MIDA ofrece una entrada poderosa y general a los alcoholes secundarios enantioenriquecidos y compuestos relacionados.
  • Este método amplía el alcance de la ATH y proporciona una herramienta valiosa para la síntesis de moléculas complejas, incluidos objetivos desafiantes como el intermedio (R) - cloperastina.
  • Los hallazgos ponen de relieve el potencial de los boronatos MIDA en la catálisis asimétrica y la síntesis estereoselectiva.