A novel and simple transamidation of carboxamides in 1,4-dioxane without a catalyst

Transamidation of aromatic amines with formamides using cyclic dihydrogen tetrametaphosphate

Amide fragments are found to be one of the key constituents in a wide range of natural products and pharmacologically active compounds. Herein, we report a simple and efficient procedure for transamidation with a cyclic dihydrogen tetrametaphosphate. The protocol is simple, does not require any additives, and encompasses a broad substrate scope. To comprehend the mechanism of the present methodology, detailed spectroscopic and kinetic studies were undertaken.

Amide Synthesis by Transamidation of Primary Carboxamides

The amide functionality is one of the most important and widely used groups in nature and in medicinal and industrial chemistry. Because of its importance and as the actual synthetic methods suffer from major drawbacks, such as the use of a stoichiometric amount of an activating agent, epimerization and low atom economy, the development of new and efficient amide bond forming reactions is needed. A number of greener and more effective strategies have been studied and developed. The transamidation of primary amides is particularly attractive in terms of atom economy and as ammonia is the single byproduct. This review summarizes the advancements in metal-catalyzed and organocatalyzed transamidation methods. Lewis and Brønsted acid transamidation catalysts are reviewed as a separate group. The activation of primary amides by promoter, as well as catalyst- and promoter-free protocols, are also described. The proposed mechanisms and key intermediates of the depicted transamidation reactions are shown.

1 Introduction

2 Metal-Catalyzed Transamidations

3 Organocatalyzed Transamidations

4 Lewis and Brønsted Acid Catalysis

5 Promoted Transamidation of Primary Amides

6 Catalyst- and Promoter-Free Protocols

7 Conclusion

Copper catalysed C–N bond formation via a sequential acylation and deacylation process: a novel strategy for the synthesis of benzanilides

An efficient oxidative amidation of aldehydes using acetanilides as amine component has been developed by copper catalysis. The approach is versatile and proceeds through sequential acylation and deacylation to afford benzanilides.

H-β-zeolite catalyzed transamidation of carboxamides, phthalimide, formamides and thioamides with amines under neat conditions

Efficient transamidation of unactivated carboxamides, phthalimides, formamides and thioamides with amines under solvent-free conditions using H-β-zeolite as a green and recyclable heterogeneous catalyst is described.

Mechanistic insights into l-proline-catalyzed transamidation of carboxamide with benzylamine from density functional theory calculations

Density functional theory was used to study mechanism of transamidation of carboxamides with amines catalysed by l-proline in three different solvents.