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Current Microwave Chemistry


ISSN (Print): 2213-3356
ISSN (Online): 2213-3364

Research Article

Effect of Microwave Radiation on the Solvent-free Synthesis of Phthaloylamino Acids

Author(s): Natalia A. Pankrushina*, Mikhail O. Korotkikh and Alexander N. Mikheev

Volume 10, Issue 1, 2023

Published on: 11 July, 2023

Page: [60 - 65] Pages: 6

DOI: 10.2174/2213335610666230523114340

Price: $65


Background: In recent years, microwave radiation has been widely used in organic synthesis, including solvent-free mode. However, the reaction conditions of phthalic anhydride with amino acids under solvent-free microwave activation have not been studied so far.

Objective: In the present work, the effect of microwave activation on the interaction of phthalic anhydride with amino acids in solvent-free conditions has been studied in detail.

Methods: The microwave heating dynamics of phthalic anhydride, glycine and their equimolar mixture under microwave conditions have been investigated, and the dependence of the heating rate on the microwave power is defined.

Results: The common conditions for the synthesis of phthaloylamino acids have been determined as continuous heating at a power of 200 W at 130 °C for 5-6 min and additional heating for 5-10 min at a temperature close to the melting point of the corresponding amino acid. We have applied the developed two-step solvent-free microwave reaction protocol successfully for the synthesis of phthaloyl derivatives of glycine, alanine, β-alanine, 4-aminobenzoic acid, γ-aminobutyric acid, isoleucine, leucine, phenylalanine.

Conclusion: Reaction conditions for synthesizing phthaloylamino acids by microwave activation without solvent have been established. The solvent-free microwave reaction between phthalic anhydride and amino acid has been found to proceed in the melted phthalic anhydride.

Keywords: Microwave activation, solvent-free reaction, phthaloylamino acids, microwave heating dynamics.

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