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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...

Peptide Bonds

Peptide Bonds

A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.

Aldehydes and Ketones with Amines: Imine Formation Mechanism

Aldehydes and Ketones with Amines: Imine Formation Mechanism

Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

Enamine formation involves the addition of carbonyl compounds to a secondary amine through a series of reactions. The mechanism begins with the generation of carbinolamine, a nucleophilic attack followed by several proton transfer reactions. The hydroxyl group of the carbinolamine is converted into water to make a better leaving group that can push the reaction forward by eliminating a water molecule. In enamine formation, the last step involves the abstraction of a proton from the α carbon to...

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...

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Related Experiment Video

Updated: Jul 18, 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

Emerging methods in amide- and peptide-bond formation.

Jeffery W Bode¹

¹Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510, USA. bode@chem.ucsb.edu

Current Opinion in Drug Discovery & Development

|November 23, 2006

Summary

New methods for amide bond formation offer alternatives to traditional coupling reactions. These advances enable chemoselective ligation and the coupling of unprotected peptide fragments, expanding synthetic possibilities in chemistry.

Area of Science:

Organic Chemistry
Medicinal Chemistry
Biochemistry

Background:

Amide bonds are crucial linkages in peptides, proteins, and therapeutics.
Current amide bond synthesis predominantly uses dehydrative coupling of amines and carboxylic acids.
This traditional method often requires excess expensive reagents and limits chemoselective reactions.

Purpose of the Study:

To review emerging chemical strategies for amide bond formation.
To highlight ligation reactions for coupling unprotected peptide fragments.
To present alternatives to conventional amide synthesis.

Main Methods:

Literature review of recent advancements in amide bond formation.
Focus on novel ligation strategies and their mechanisms.

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Analysis of methods enabling chemoselective coupling.

Main Results:

Several novel chemical approaches to amide bond synthesis have emerged.
These methods offer improved efficiency and selectivity compared to traditional routes.
Specific attention is given to ligation reactions for unprotected peptide coupling.

Conclusions:

Emerging amide bond formation techniques provide valuable alternatives to established methods.
These new strategies facilitate chemoselective ligation and peptide synthesis.
The reviewed methods hold promise for advancing drug discovery and peptide chemistry.