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Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
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Preparation of 1° Amines: Gabriel Synthesis01:28

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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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Preparation and Reactions of Sulfides02:26

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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Preparation of 1° Amines: Azide Synthesis01:22

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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Preparation of Amines: Reduction of Amides and Nitriles01:13

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Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
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N-Alkoxysulfurdiimide Reagents for the One-Step Modular Synthesis of Primary Sulfonimidamides.

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Preparation of N-2-alkoxyvinylsulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines
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Adición catalizada por paladio de haluros de arilo a las N-sulfinilaminas para la síntesis de sulfinamidas

Ming-Kai Wei1, Daniel F Moseley1, Robin M Bär2

  • 1Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom.

Journal of the American Chemical Society
|July 12, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio introduce un nuevo método catalizado por el paladio para sintetizar sulfinamidas a partir de precursores fácilmente disponibles. Este enfoque ofrece condiciones suaves y una amplia tolerancia de grupo funcional, superando las limitaciones de los métodos tradicionales.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Metodología sintética

Sus antecedentes:

  • Las sulfinamidas son valiosos intermediarios sintéticos.
  • La síntesis tradicional de sulfinamida requiere precursores específicos de azufre y condiciones difíciles.
  • Los métodos existentes tienen un alcance de sustrato y tolerancia de grupo funcional limitados.

Objetivo del estudio:

  • Para desarrollar una nueva vía sintética más suave para las sulfinamidas.
  • Permitir la síntesis de sulfinamidas a partir de haluros de arilo y alquenilo (pseudo) y de las N-sulfinilaminas.
  • Lograr una amplia generalidad y una alta tolerancia del grupo funcional en la síntesis de sulfinamidas.

Principales métodos:

  • Reacciones de acoplamiento cruzado catalizadas por el paladio.
  • Utilizando como materiales de partida los haluros de arilo y de alquenilo (pseudo).
  • El uso de N-sulfinylaminas como socios de acoplamiento.

Principales resultados:

  • Síntesis exitosa de sulfinamidas bajo condiciones suaves.
  • Evitar el uso de reactivos organometálicos altamente reactivos.
  • Tolerancia demostrada a los grupos funcionales próticos y electrófilos.
  • Aplicación en núcleos de arilo complejos y derivados de productos naturales.

Conclusiones:

  • El método desarrollado catalizado por el paladio proporciona una vía versátil y eficiente para las sulfinamidas.
  • Este enfoque amplía la utilidad sintética de las sulfinamidas al permitir condiciones más suaves y un alcance más amplio del sustrato.
  • El método es aplicable a moléculas complejas, mostrando su valor práctico en la síntesis orgánica.