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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

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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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Preparation of Amines: Reduction of Amides and Nitriles01:13

Preparation of Amines: Reduction of Amides and Nitriles

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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,...
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Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

6.2K
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.
6.2K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

4.6K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
4.6K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.8K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.8K
Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

4.6K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Updated: Jan 12, 2026

Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine
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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

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Asymmetric reductive amination.

Chao Wang1, Jianliang Xiao

  • 1Key Laboratory of Applied Surface and Colloid Chemistry of Ministry of Education, and Department of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, 710062, China, c.wang@snnu.edu.cn.

Topics in Current Chemistry
|October 26, 2013
PubMed
Summary
This summary is machine-generated.

Asymmetric reductive amination provides a direct route to chiral amines. Recent advances focus on catalytic methods including hydrogenation, transfer hydrogenation, organocatalysis, and biocatalysis for efficient synthesis.

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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Chemistry

Background:

  • Chiral amines are essential building blocks in pharmaceuticals and agrochemicals.
  • Asymmetric reductive amination (ARA) is a key strategy for their synthesis.
  • Developing efficient and selective ARA methods remains a significant challenge.

Purpose of the Study:

  • To review recent advancements in asymmetric reductive amination.
  • To highlight key catalytic approaches for chiral amine synthesis.
  • To provide a comprehensive overview of the current state-of-the-art in ARA.

Main Methods:

  • Focus on ARA via hydrogenation.
  • Exploration of transfer hydrogenation techniques.
  • Review of organocatalytic reduction methods.
  • Discussion of biocatalytic reduction approaches.

Main Results:

  • Significant progress has been made in developing various catalytic systems for ARA.
  • High enantioselectivities and yields are achievable with optimized methods.
  • Each catalytic strategy offers distinct advantages for specific substrates.

Conclusions:

  • Asymmetric reductive amination has evolved significantly with diverse catalytic options.
  • Catalytic ARA is a powerful and versatile tool for accessing chiral amines.
  • Continued innovation in catalysis promises further improvements in efficiency and scope.