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Preparation of Amides01:29

Preparation of Amides

3.2K
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...
3.2K
Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

2.7K
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...
2.7K
Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

5.0K
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.
5.0K
Amides to Carboxylic Acids: Hydrolysis01:28

Amides to Carboxylic Acids: Hydrolysis

3.5K
Amides can undergo either acid-catalyzed hydrolysis or base-promoted hydrolysis through a typical nucleophilic acyl substitution. Each hydrolysis requires severe conditions.
Acid-catalyzed hydrolysis:
Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat.
The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
3.5K
Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

6.3K
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...
6.3K
Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

3.1K
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
3.1K

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Amine Activation: "Inverse" Dipeptide Synthesis and Amide Function Formation through Activated Amino Compounds.

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A new copper(II)/HOBt-catalyzed method enables rapid microwave-assisted synthesis of dipeptides and amides using N-acyl imidazoles. This approach facilitates challenging N → C synthesis with minimal racemization, even for sensitive amino acids.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Catalysis

Background:

  • Traditional methods for amide and dipeptide synthesis often require harsh conditions or complex activation steps.
  • The N → C synthesis direction for amides and peptides is less explored and presents unique challenges.
  • N-acyl imidazoles offer an alternative activation strategy for carboxylic acid derivatives.

Purpose of the Study:

  • To develop an efficient and mild catalytic procedure for synthesizing dipeptides and amides.
  • To explore the N → C synthesis pathway for amide and peptide bond formation.
  • To utilize microwave irradiation for accelerating the coupling reactions.

Main Methods:

  • Copper(II)/HOBt catalysis was employed for the coupling reactions.
  • N-acyl imidazoles were used as activated amino acid precursors.
  • Microwave irradiation was applied to significantly reduce reaction times.
  • The synthesis was validated using sensitive amino acids to assess racemization.

Main Results:

  • A series of dipeptides and general amides were successfully synthesized.
  • The method demonstrated applicability in gram-scale synthesis.
  • Couplings proceeded under mild conditions, preserving the integrity of sensitive amino acids.
  • No detectable racemization was observed in the synthesized products.
  • A plausible reaction mechanism for the catalytic cycle was proposed based on experimental data.

Conclusions:

  • The developed copper(II)/HOBt-catalyzed method provides an efficient route to dipeptides and amides via N → C synthesis.
  • Microwave irradiation and N-acyl imidazoles offer a rapid and mild alternative to conventional activation methods.
  • The procedure's ability to prevent racemization makes it suitable for synthesizing complex peptides and incorporating sensitive amino acids.