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Related Concept Videos

Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

3.2K
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.
3.2K
Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

6.9K
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...
6.9K
Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

5.5K
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.
5.5K
Preparation of Amines: Reduction of Amides and Nitriles01:13

Preparation of Amines: Reduction of Amides and Nitriles

2.7K
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,...
2.7K
Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

4.2K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
4.2K
Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

5.4K
Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
5.4K

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Updated: Oct 22, 2025

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
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Artificial imine reductases: developments and future directions.

Rosalind L Booth1, Gideon Grogan2, Keith S Wilson2

  • 1Department of Chemistry, University of York UK anne.duhme-klair@york.ac.uk.

RSC Chemical Biology
|August 30, 2021
PubMed
Summary
This summary is machine-generated.

Artificial imine reductases (artIREDs) are engineered biocatalysts for chiral amine production. This review details their design, performance enhancement strategies, and future potential in biocatalysis.

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Area of Science:

  • Biocatalysis
  • Enzyme Engineering
  • Organic Synthesis

Background:

  • Biocatalytic imine reduction is crucial for synthesizing chiral amines.
  • Artificial metalloenzymes (artIREDs) offer promising routes for enantioselective imine reduction.
  • Significant research has focused on engineering artificial constructs and natural enzymes for this purpose.

Purpose of the Study:

  • To review the design of major classes of artificial imine reductases (artIREDs).
  • To summarize methods for enhancing the catalytic performance of artIREDs.
  • To explore the current scope and future potential of artIREDs in biocatalysis.

Main Methods:

  • Review of published literature on artificial imine reductases.
  • Analysis of catalyst design strategies.
  • Summary of performance enhancement techniques.
  • Examination of in vivo and multi-enzyme cascade applications.

Main Results:

  • Various classes of artIREDs have been designed and engineered.
  • Complementary methods can enhance catalytic performance.
  • In vivo and cascade applications show potential but current use is limited.
  • Strategies for catalyst improvement are diverse.

Conclusions:

  • Artificial imine reductases hold significant potential for chiral amine synthesis.
  • Further development is needed to overcome current limitations in biocatalysis.
  • Continued research into catalyst design and enhancement is crucial for broader application.