Reductive Amination
Reductive Amination - Related Videos
01:38
Preparation of Amines: Reductive Amination of Aldehydes and Ketones
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2023
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. Reductive amination using sodium cyanoborohydride as the reducing agent is called the Borch reaction. Sodium cyanoborohydride is a mild...
13:59
Methods to Identify the NMR Resonances of the 13C-Dimethyl N-terminal Amine on Reductively Methylated Proteins
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Cited by 4 •
2013
Two methods for assigning the α- and ε-dimethylamine nuclear magnetic resonance signals of a reductively 13C-methylated N-terminal lysine are described. One method utilizes the pH-induced selectivity of the reductive methylation reaction, and the other uses aminopeptidase to selectively remove the N-terminal lysine.
01:20
Amides to Amines: LiAlH4 Reduction
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2025
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.
01:13
Preparation of Amines: Reduction of Amides and Nitriles
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2023
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,...
00:55
Nitriles to Amines: LiAlH4 Reduction
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2025
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...
FAQs
The imine or iminium intermediate connects the carbonyl compound to the nitrogen source before reduction occurs. Its formation shows that the amine has engaged the aldehyde or ketone, creating the chemical state that can receive hydrogen from NAD(P)H or a laboratory hydride reagent. This two-stage sequence explains how carbonyl chemistry becomes an amine-containing product.
The reducing agent supplies the hydrogen needed to convert the imine or iminium intermediate into the final amine. In enzyme-catalyzed biology, NAD(P)H serves this role, whereas laboratory synthesis can use a hydride reagent. This distinction links the same reaction chemistry to either metabolic enzyme systems or controlled pharmaceutical preparation.
Aminotransferases and reductive aminases use reductive-amination chemistry within biological systems to build or modify amino acids and other nitrogen-containing metabolites. Their activity places the reaction inside enzymatic pathways rather than treating it only as a laboratory transformation. Studying these enzymes therefore helps connect individual chemical steps with biological synthesis and metabolism.
Reductive amination provides a chemical route from aldehydes or ketones to nitrogen-containing products, allowing carbonyl compounds to participate in the formation or modification of amino acids and related metabolites. This connection is important because it integrates carbonyl transformations with biological nitrogen chemistry, making the reaction relevant to both synthesis and metabolic pathway analysis.
The main distinction is the source of the reducing power and the setting in which the reaction occurs. Biological systems use enzymes together with NAD(P)H, while laboratory procedures use a hydride reagent after the amine and carbonyl compound form an intermediate. This comparison helps researchers frame the same chemistry as either enzymatic metabolism or synthetic preparation.
In biology, the reaction is relevant to amino acids and other nitrogen-containing metabolites. Enzymatic use can therefore contribute either to constructing these molecules or to changing existing metabolite structures. This scope makes reductive amination useful for examining how nitrogen-containing compounds arise within biological synthesis rather than limiting its significance to a single product class.
Reductive amination supports pharmaceutical synthesis by allowing carbonyl-containing starting materials and amines to be connected through an imine or iminium intermediate, followed by reduction to an amine. The reaction is valuable in medicinal chemistry because amine-containing structures are common targets of synthetic planning, and the chemistry provides a direct way to generate such products.
Because aminotransferases and reductive aminases use this chemistry to build or modify amino acids and other nitrogen-containing metabolites, the reaction offers a way to examine specific steps in metabolic pathways. Researchers can relate enzyme activity to the appearance or modification of these compounds, clarifying how nitrogen-containing metabolites are produced within biological systems.