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Amines: Introduction

Amines: Introduction

Amines are organic derivatives of ammonia. They are formed by replacing one or more ammonia protons with alkyl or aryl groups. Depending upon the number of organyl groups bonded to nitrogen, amines are classified as primary, secondary, or tertiary. Primary amines have one organyl group attached to the nitrogen atom, while secondary and tertiary amines have two and three organyl groups attached to the nitrogen atom, respectively.

Preparation of Amines: Reduction of Oximes and Nitro Compounds

Preparation of Amines: Reduction of Oximes and Nitro Compounds

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,...

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

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.

Physical Properties of Amines

Physical Properties of Amines

Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.

Preparation of 1° Amines: Azide Synthesis

Preparation of 1° Amines: Azide Synthesis

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...

Preparation of 1° Amines: Gabriel Synthesis

Preparation of 1° Amines: Gabriel Synthesis

Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...

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Updated: May 21, 2025

A Direct, Early Stage Guanidinylation Protocol for the Synthesis of Complex Aminoguanidine-containing Natural Products

A Direct, Early Stage Guanidinylation Protocol for the Synthesis of Complex Aminoguanidine-containing Natural Products

Published on: September 9, 2016

Hydroxylamine natural products.

Roderick W Bates¹, Thang Loi Pham¹, Patcharaporn Sae-Lao¹

¹School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 21 Nanyang Link, Singapore.

The Alkaloids. Chemistry and Biology

|March 20, 2025

Summary

This review explores natural products featuring the hydroxylamine functional group. It covers their diverse structures, isolation, biosynthesis, and synthesis, highlighting novel compounds.

Keywords:

Diketopiperazine Hydroxylamine Indole Isoxazolidine Oxazine Pyridone

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Area of Science:

Natural Product Chemistry
Organic Chemistry

Background:

Hydroxylamine-containing compounds are a diverse class of natural products.
These molecules exhibit a wide range of structural motifs and biological activities.

Purpose of the Study:

To provide a comprehensive overview of natural products containing the hydroxylamine group.
To discuss the isolation, characterization, biosynthesis, and synthesis of these compounds.

Main Methods:

Literature review of natural products containing hydroxylamine moieties.
Categorization of compounds based on structural features (e.g., acyclic, heterocyclic).
Discussion of synthetic and biosynthetic pathways.

Main Results:

Identification of numerous natural products with hydroxylamine groups, including acyclic forms, isoxazolidines, 1,2-oxazines, and diketopiperazines.
Exploration of N-hydroxy/N-methoxy derivatives of pyrroles, indoles, carbazoles, and carbolines.
Inclusion of pyridones and other cyclic structures with exocyclic hydroxylamines, as well as O-acylhydroxylamines.
Discussion of compounds with limited or unprecedented precedent.

Conclusions:

Natural products with hydroxylamine groups represent a significant and structurally diverse area of chemical research.
Understanding their isolation, biosynthesis, and synthesis is crucial for discovering new bioactive molecules.