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Related Concept Videos

α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview01:19

α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview

The pinacol and McMurry reactions involve the reductive coupling of ketones or aldehydes. Similarly, the bimolecular reductive coupling of two ester molecules in the presence of sodium metal in an aprotic solvent yields an α-hydroxy ketone product. The α-hydroxy ketone is also called acyloin, so the reaction is referred to as ‘acyloin condensation.’
Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

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.
Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

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 amide...
Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis01:07

Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis

Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an alkylated β-keto acid.
Acid-Catalyzed Aldol Addition Reaction01:15

Acid-Catalyzed Aldol Addition Reaction

The aldol reaction of a ketone under acidic conditions successfully forms an unsaturated carbonyl as the final product instead of an aldol. The acid-catalyzed aldol reaction is depicted in Figure 1.
Phase II Reactions: Acetylation Reactions01:24

Phase II Reactions: Acetylation Reactions

Acetylation, a phase II biotransformation reaction, introduces an acetyl group to drugs or their metabolites. Acetyltransferase enzymes facilitate this reaction, which resembles α-amino acid conjugation due to the addition of a functional group to the drug molecule.
The substrates for acetylation are typically drugs or their metabolites with an amino, sulfonamide, or hydrazine functional group. Acetylation can occur at several points in the drug molecule, including primary, secondary, and...

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Exerting control over the acyloin reaction.

Timothy J Donohoe1, Ali Jahanshahi, Michael J Tucker

  • 1Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK. timothy.donohoe@chem.ox.ac.uk

Chemical Communications (Cambridge, England)
|April 20, 2011
PubMed
Summary

Researchers developed a new solution-phase electron transfer method for the acyloin reaction. This innovative technique enables selective crossed acyloin reactions between different ester types, favoring intramolecular coupling.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • The acyloin reaction is a crucial carbon-carbon bond-forming reaction.
  • Traditional methods often require specific conditions or reagents.
  • Developing efficient and selective acyloin reaction protocols remains an active area of research.

Purpose of the Study:

  • To introduce a novel synthetic method for the acyloin reaction.
  • To utilize electron transfer in solution for acyloin condensation.
  • To achieve selective crossed acyloin reactions between distinct ester functionalities.

Main Methods:

  • A synthetic strategy involving the linkage of two esters via their oxygen atoms was employed.
  • Electron transfer in solution was used to initiate the reaction.
  • The reaction conditions were optimized to promote intramolecular coupling.

Main Results:

  • A new, efficient solution-phase method for the acyloin reaction was successfully developed.
  • Crossed acyloin reactions between different ester types were achieved.
  • A high degree of preference for intramolecular coupling was observed, demonstrating selectivity.

Conclusions:

  • The reported electron transfer method offers a viable alternative for acyloin synthesis.
  • The strategy allows for controlled and selective formation of carbon-carbon bonds.
  • This approach has potential applications in the synthesis of complex organic molecules.