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Preparation of Amides

Preparation of Amides

Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...

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 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.

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.

Amines to Amides: Acylation of Amines

Amines to Amides: Acylation of Amines

Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...

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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Related Experiment Video

Updated: May 5, 2026

Split-and-pool Synthesis and Characterization of Peptide Tertiary Amide Library

Split-and-pool Synthesis and Characterization of Peptide Tertiary Amide Library

Published on: June 20, 2014

Rethinking amide bond synthesis.

Vijaya R Pattabiraman¹, Jeffrey W Bode

¹Laboratorium für Organische Chemie, ETH Zürich, 8093 Zürich, Switzerland.

|December 24, 2011

Summary

This summary is machine-generated.

Novel amide bond formation reactions address limitations in current methods. These new chemical approaches offer sustainable and cost-effective solutions for synthesizing pharmaceuticals and peptides.

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Area of Science:

Organic Chemistry
Medicinal Chemistry
Synthetic Chemistry

Background:

Amide bond formation is crucial in organic chemistry, particularly for pharmaceuticals and biologically active compounds.
Existing amide synthesis methods face limitations regarding waste, cost, and efficiency.
There is a growing need for innovative and sustainable amide bond-forming reactions.

Purpose of the Study:

To review and summarize a new generation of amide-forming reactions.
To highlight novel chemical approaches addressing the limitations of current methods.
To explore the potential applications of these new reactions in synthetic challenges.

Main Methods:

Review of recent literature on amide bond formation.
Categorization and summary of novel amide-forming reactions.
Analysis of the advantages and limitations of new methods.

Main Results:

Identification of several new amide-forming reactions with improved efficiency and sustainability.
Demonstration of potential for catalytic amide formation.
Exploration of applications in peptide and protein synthesis.

Conclusions:

New amide-forming reactions offer promising solutions to overcome the challenges of traditional methods.
These advancements can facilitate the synthesis of complex molecules, including therapeutic peptides and modified proteins.
Further development of catalytic and sustainable amide bond formation is essential for modern organic synthesis.