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Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

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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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Electrophilic Aromatic Substitution: Friedel–Crafts Acylation of Benzene01:11

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The Friedel–Crafts acylation reactions involve the addition of an acyl group to an aromatic ring. These reactions proceed via electrophilic aromatic substitution by employing an acyl chloride and a Lewis acid catalyst such as aluminum chloride to form aryl ketone.
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Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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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.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
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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.
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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

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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 Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
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RNA SHAPE chemistry with aromatic acylating reagents.

Laura Nodin1, Olivier Noël1, Françoise Chaminade2

  • 1PPSM, CNRS, Institut d'Alembert, ENS de Cachan, 61 Avenue du P(t) Wilson, F-94235 Cachan, France.

Bioorganic & Medicinal Chemistry Letters
|January 6, 2015
PubMed
Summary

This study enhances selective 2'-hydroxyl acylation for RNA structure determination. Nucleophilic catalysts significantly improved acylation efficiency with specific anhydrides, advancing chemical probing methods.

Keywords:
Active esterAcyl fluorideAcylating reagentRNASHAPE chemistrySymmetric anhydride

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Area of Science:

  • Chemical Biology
  • Molecular Biology
  • RNA Structure Determination

Background:

  • Selective 2 ext-hydroxyl acylation analyzed by primer extension (SHAPE) chemistry is a key method for RNA secondary structure analysis.
  • Existing SHAPE reagents target flexible nucleotides but can lack specificity.
  • Improving reagent specificity is crucial for accurate RNA structure probing.

Purpose of the Study:

  • To explore novel acylating reagents for enhanced specificity in 2 ext-hydroxyl acylation.
  • To investigate the role of nucleophilic catalysts in improving acylation efficiency and selectivity.
  • To identify optimal chemical conditions for RNA secondary structure determination using SHAPE chemistry.

Main Methods:

  • Synthesis and testing of various acylating reagents including symmetric anhydrides, acyl fluorides, and active esters.
  • Evaluation of reagent reactivity for 2 ext-O-acylation of RNA nucleotides.
  • Assessment of nucleophilic catalysts, such as DMAP, to enhance acylation reactions.

Main Results:

  • Acyl fluoride 4 showed low reactivity compared to N-methylimidazole (NMIA).
  • Nucleophilic catalysts, particularly DMAP, significantly improved selective 2 ext-hydroxyl acylation.
  • 2-Fluorobenzoic anhydride 5 demonstrated the highest reactivity among tested compounds when catalyzed.

Conclusions:

  • Nucleophilic catalysis is a powerful strategy to enhance the selectivity and efficiency of SHAPE chemistry.
  • The findings provide a pathway to develop more specific and reactive reagents for RNA structure probing.
  • This research advances chemical methods for detailed RNA secondary structure analysis.