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Related Concept Videos

Aldehydes and Ketones with Amines: Enamine Formation Mechanism01:14

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

Enamine formation involves the addition of carbonyl compounds to a secondary amine through a series of reactions. The mechanism begins with the generation of carbinolamine, a nucleophilic attack followed by several proton transfer reactions. The hydroxyl group of the carbinolamine is converted into water to make a better leaving group that can push the reaction forward by eliminating a water molecule. In enamine formation, the last step involves the abstraction of a proton from the α carbon to...
Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

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Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.
Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

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...
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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Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Enamine catalysis.

Petri M Pihko1, Inkeri Majander, Anniina Erkkilä

  • 1Department of Chemistry, University of Jyväskylä, P. O. B. 35, FI-40014 JYU, Jyväskylä, Finland. Petri.Pihko@jyu.fi

Topics in Current Chemistry
|April 16, 2011
PubMed
Summary

Chiral amines react with carbonyl compounds to form enamines, enabling enantioselective catalysis. This review covers structure-activity relationships, scope, and limitations of enamine catalysis.

Area of Science:

  • Organic Chemistry
  • Asymmetric Catalysis

Background:

  • Enamines are nucleophilic intermediates formed from primary or secondary amines and enolizable aldehydes or ketones.
  • Chiral amines enable enantioselective reactions through enamine intermediates.

Purpose of the Study:

  • To review structure-activity relationships in enamine catalysis.
  • To discuss the scope and limitations of current enamine catalysis methods.

Main Methods:

  • Literature review of enamine catalysis.
  • Analysis of structure-activity relationships.
  • Evaluation of reaction scope and limitations.

Main Results:

  • Enamine catalysis offers a pathway for enantioselective synthesis.

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  • Understanding structure-activity relationships is key to optimizing enamine catalysts.
  • Current limitations include substrate scope and catalyst efficiency.
  • Conclusions:

    • Enamine catalysis is a powerful tool for asymmetric synthesis.
    • Further research is needed to expand the scope and overcome limitations.
    • Optimized enamine catalysts can significantly impact chiral amine synthesis.