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Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

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Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
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Preparation of Alkynes: Alkylation Reaction02:27

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Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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Preparation of Alkynes: Dehydrohalogenation02:34

Preparation of Alkynes: Dehydrohalogenation

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Introduction
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

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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.
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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

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Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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SN2 Reaction: Stereochemistry02:23

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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
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Interrupted SNAr-Alkylation Dearomatization.

Bilal Altundas1, John-Paul R Marrazzo2, Tore Brinck3

  • 1Department of Chemistry, University of Illinois Urbana-Champagne, 505 South Mathews Avenue Urbana, Champaign, Illinois 61801, United States.

JACS Au
|April 1, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a mild dearomatization method using lithiated nitriles or isocyanides. This efficient synthetic strategy rapidly creates complex carbocycles and heterocycles with new carbon-carbon bonds.

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Area of Science:

  • Organic Synthesis
  • Medicinal Chemistry

Background:

  • Dearomatization reactions are crucial for synthesizing carbocycles and heterocycles prevalent in bioactive molecules.
  • Traditional dearomatization methods often necessitate harsh reagents due to the stability of aromatic systems.

Purpose of the Study:

  • To develop a milder and more efficient dearomatization strategy.
  • To enable rapid assembly of complex molecular scaffolds.

Main Methods:

  • Utilized lithiated nitriles or isocyanides for SNAr-type addition to aromatic substrates.
  • Employed alkylation to trap the intermediate σ-complexes.
  • Developed a diastereoselective dearomatization protocol.

Main Results:

  • Achieved efficient dearomatization under relatively mild conditions.
  • Successfully installed two new carbon-carbon bonds, including a quaternary center.
  • Introduced nitrile, isocyanide, and cyclohexadiene functionalities in a single synthetic operation.

Conclusions:

  • The described method offers a facile and diastereoselective route to substituted carbocycles and heterocycles.
  • This approach simplifies the synthesis of valuable molecular frameworks, potentially accelerating drug discovery.
  • The strategy overcomes limitations of traditional dearomatization techniques by employing accessible reagents.