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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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Phase I Reactions: Reductive Reactions01:27

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Phase I biotransformation reductive reactions are chemical processes that modify drugs by introducing or revealing polar functional groups via reduction. Enzymes called reductases catalyze these reactions, playing a pivotal role in drug metabolism by transforming lipophilic drugs into more polar, water-soluble metabolites for easy excretion. An essential type of reductive reaction is the carbonyl group reduction, where aldehydes and ketones are reduced to alcohols. An example is the...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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...
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Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

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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,...
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Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
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Nitriles to Amines: LiAlH4 Reduction00:55

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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...
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Updated: Sep 27, 2025

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Multifunctional biocatalyst for conjugate reduction and reductive amination.

Thomas W Thorpe1, James R Marshall1, Vanessa Harawa1

  • 1Department of Chemistry, University of Manchester, Manchester Institute of Biotechnology, Manchester, UK.

Nature
|April 7, 2022
PubMed
Summary
This summary is machine-generated.

A novel enzyme, EneIRED, efficiently synthesizes chiral amine diastereomers, crucial for pharmaceuticals and agrochemicals. This biocatalyst uses an unreported mechanism for asymmetric synthesis, simplifying production.

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Area of Science:

  • Biocatalysis and Synthetic Biology
  • Organic Chemistry

Background:

  • Chiral amine diastereomers are essential in pharmaceuticals and agrochemicals.
  • Current synthesis methods are often inefficient and multi-step.
  • Asymmetric synthesis is critical due to differing biochemical properties of enantiomers.

Purpose of the Study:

  • To characterize a novel multifunctional biocatalyst for chiral amine synthesis.
  • To elucidate the unique catalytic mechanism of the enzyme.
  • To explore the enzyme's potential in asymmetric synthesis of complex chiral amines.

Main Methods:

  • Enzyme discovery from a metagenomic imine reductase (IRED) collection.
  • Biocatalyst characterization including mechanistic and structural studies.
  • Assessing the enzyme's substrate scope for coupling carbonyls and amines.

Main Results:

  • Identification and characterization of EneIRED, a novel biocatalyst from Pseudomonas.
  • EneIRED utilizes an unreported mechanism involving amine-activated conjugate alkene reduction and reductive amination.
  • The enzyme efficiently produces chiral amine diastereomers with up to three stereocenters from diverse substrates.

Conclusions:

  • EneIRED offers an efficient route to valuable chiral amine diastereomers.
  • The IRED family serves as a promising platform for discovering new enzymatic activities.
  • This work advances synthetic biology and organic synthesis applications.