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Continuous synthesis of N-(3-Amino-4-methylphenyl)benzamide and its kinetics study in microflow system

Continuous synthesis of N-(3-Amino-4-methylphenyl)benzamide and its kinetics study in microflow... N-(3-Amino-4-methylphenyl)benzamide (1) is a crucial building blocks of many drug candidates. In this paper, a continuous flow microreactor system was developed to synthesize 1 and determine intrinsic reaction kinetics parameters. By screening the acylating reagents and reaction conditions, 1 was obtained by the selective acylation of 4-methylbenzene-1,3-diamine (2) with benzoic anhydride (3). Since the two amine groups in 2 are in different chemical environments, parallel by-products and serial by-products coexist, which makes the selective monoacylation process relatively complicated. To reveal the reaction process clearly, reaction rate constants and their 95% confidence intervals, activation energies, pre-exponential factors were acquired by kinetics study in microflow system. The established kinetic model can calculate the selectivity and conversion of the acylation reaction, which are in good agreement with the experimental results. Subsequently, the kinetic model was used to optimize reaction conditions, as a result, 1 was synthesized in the microreactor with a yield of 85.7% within 10 min. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Flow Chemistry Springer Journals

Continuous synthesis of N-(3-Amino-4-methylphenyl)benzamide and its kinetics study in microflow system

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Publisher
Springer Journals
Copyright
Copyright © Akadémiai Kiadó 2022. Springer Nature or its licensor holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
ISSN
2062-249X
eISSN
2063-0212
DOI
10.1007/s41981-022-00241-1
Publisher site
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Abstract

N-(3-Amino-4-methylphenyl)benzamide (1) is a crucial building blocks of many drug candidates. In this paper, a continuous flow microreactor system was developed to synthesize 1 and determine intrinsic reaction kinetics parameters. By screening the acylating reagents and reaction conditions, 1 was obtained by the selective acylation of 4-methylbenzene-1,3-diamine (2) with benzoic anhydride (3). Since the two amine groups in 2 are in different chemical environments, parallel by-products and serial by-products coexist, which makes the selective monoacylation process relatively complicated. To reveal the reaction process clearly, reaction rate constants and their 95% confidence intervals, activation energies, pre-exponential factors were acquired by kinetics study in microflow system. The established kinetic model can calculate the selectivity and conversion of the acylation reaction, which are in good agreement with the experimental results. Subsequently, the kinetic model was used to optimize reaction conditions, as a result, 1 was synthesized in the microreactor with a yield of 85.7% within 10 min.

Journal

Journal of Flow Chemistry – Springer Journals

Published: Sep 1, 2022

Keywords: Selective acylation; Continuous synthesis; Microreactor; Reaction kinetics; N-(3-Amino-4-methylphenyl)benzamide

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