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Videos de Conceptos Relacionados

Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

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Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
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Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
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Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

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Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
6.4K
Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

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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.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
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Structure of Amines01:19

Structure of Amines

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The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’...
2.7K
Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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Resolución dinámica de aminas inducida por cristalización impulsada por la luz

Jonathan M Meinhardt1, Diane D Kim1, Emily J Wu1

  • 1Department of Chemistry, Princeton University; Princeton, New Jersey 08544, United States.

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Este estudio introduce un nuevo método para la separación de enantiómeros de aminas quirales mediante catálisis fotorredóxica y cristalización. Este enfoque resuelve eficientemente las aminas racémicas, produciendo altos rendimientos de enantiómeros específicos para la síntesis química.

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Área de la Ciencia:

  • Química orgánica
  • Síntesis asimétrica
  • Catálisis

Sus antecedentes:

  • Las aminas quirales son bloques de construcción cruciales en productos farmacéuticos y productos químicos finos.
  • Los métodos eficientes para la resolución enantiomérica de aminas racémicas son muy buscados.
  • Los métodos existentes pueden verse limitados por condiciones adversas o bajos rendimientos.

Objetivo del estudio:

  • Desarrollar un método nuevo, suave y eficiente para la resolución dinámica de aminas racémicas.
  • Para acoplar la racemización catalítica mediada por fotorredóxido con la cristalización diastereomérica in situ.
  • Proporcionar un enfoque simplificado para acceder a las aminas α-quirales enantioméricamente puras.

Principales métodos:

  • Utilizando un cromóforo de iridio y un cocatalizador de tiol aciral para la racemicidad mediada por fotorredóxido.
  • Utilizando la formación de sales diastereoméricas in situ con ácidos disolventes quirales.
  • Aplicación del método a diversas estructuras de aminas secundarias y terciarias.

Principales resultados:

  • Resolución dinámica exitosa de aminas racémicas bajo condiciones suaves y neutras en oxígeno.
  • Se obtienen altos rendimientos y enantioselectividades para diversas familias de aminas.
  • Utilidad demostrada a través de aminas α-quirales secundarias y terciarias.

Conclusiones:

  • El método desarrollado ofrece una estrategia eficaz para la resolución dinámica de aminas.
  • Este enfoque simplifica la preparación de valiosos compuestos de aminas quirales.
  • Potencial de amplia aplicación en la síntesis química fina y el desarrollo farmacéutico.