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The Formation of 2,2,4-Trimethyl-2,3-dihydro-1H-1,5-Benzodiazepine from 1,2-Diaminobenzene in the Presence of Acetone

In an attempt to synthesize a 2-substituted benzimidazole from the reaction of o-phenylenediamine and isophthalic acid in the presence of acetone and ethanol under microwave irradiation, a salt of the isophthalate ion and 2,2,4-trimethyl-2,3-dihydro-1H-1,5-benzodiazepin-5-ium ion was obtained. The c...

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Autores principales: Odame, Felix, Kleyi, Phumelele, Hosten, Eric, Betz, Richard, Lobb, Kevin, Tshentu, Zenixole
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6269685/
https://www.ncbi.nlm.nih.gov/pubmed/24256923
http://dx.doi.org/10.3390/molecules181114293
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author Odame, Felix
Kleyi, Phumelele
Hosten, Eric
Betz, Richard
Lobb, Kevin
Tshentu, Zenixole
author_facet Odame, Felix
Kleyi, Phumelele
Hosten, Eric
Betz, Richard
Lobb, Kevin
Tshentu, Zenixole
author_sort Odame, Felix
collection PubMed
description In an attempt to synthesize a 2-substituted benzimidazole from the reaction of o-phenylenediamine and isophthalic acid in the presence of acetone and ethanol under microwave irradiation, a salt of the isophthalate ion and 2,2,4-trimethyl-2,3-dihydro-1H-1,5-benzodiazepin-5-ium ion was obtained. The condensation of two moles of acetone with the amine groups resulted in the formation of the benzodiazepine which crystallized as an iminium cation forming a salt with the isophthalate anion. The formation of benzodiazepine was also confirmed by performing the reaction of o-phenylenediamine with excess acetone in ethanol under conventional heating conditions. The compounds were characterized by NMR, FTIR, HRMS and microanalysis as well as X-ray crystallography. The reaction mechanism leading to the formation of benzodiazepine is also discussed.
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spelling pubmed-62696852018-12-20 The Formation of 2,2,4-Trimethyl-2,3-dihydro-1H-1,5-Benzodiazepine from 1,2-Diaminobenzene in the Presence of Acetone Odame, Felix Kleyi, Phumelele Hosten, Eric Betz, Richard Lobb, Kevin Tshentu, Zenixole Molecules Communication In an attempt to synthesize a 2-substituted benzimidazole from the reaction of o-phenylenediamine and isophthalic acid in the presence of acetone and ethanol under microwave irradiation, a salt of the isophthalate ion and 2,2,4-trimethyl-2,3-dihydro-1H-1,5-benzodiazepin-5-ium ion was obtained. The condensation of two moles of acetone with the amine groups resulted in the formation of the benzodiazepine which crystallized as an iminium cation forming a salt with the isophthalate anion. The formation of benzodiazepine was also confirmed by performing the reaction of o-phenylenediamine with excess acetone in ethanol under conventional heating conditions. The compounds were characterized by NMR, FTIR, HRMS and microanalysis as well as X-ray crystallography. The reaction mechanism leading to the formation of benzodiazepine is also discussed. MDPI 2013-11-19 /pmc/articles/PMC6269685/ /pubmed/24256923 http://dx.doi.org/10.3390/molecules181114293 Text en © 2013 by the authors; licensee MDPI, Basel, Switzerland. http://creativecommons.org/licenses/by/3.0/ This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Communication
Odame, Felix
Kleyi, Phumelele
Hosten, Eric
Betz, Richard
Lobb, Kevin
Tshentu, Zenixole
The Formation of 2,2,4-Trimethyl-2,3-dihydro-1H-1,5-Benzodiazepine from 1,2-Diaminobenzene in the Presence of Acetone
title The Formation of 2,2,4-Trimethyl-2,3-dihydro-1H-1,5-Benzodiazepine from 1,2-Diaminobenzene in the Presence of Acetone
title_full The Formation of 2,2,4-Trimethyl-2,3-dihydro-1H-1,5-Benzodiazepine from 1,2-Diaminobenzene in the Presence of Acetone
title_fullStr The Formation of 2,2,4-Trimethyl-2,3-dihydro-1H-1,5-Benzodiazepine from 1,2-Diaminobenzene in the Presence of Acetone
title_full_unstemmed The Formation of 2,2,4-Trimethyl-2,3-dihydro-1H-1,5-Benzodiazepine from 1,2-Diaminobenzene in the Presence of Acetone
title_short The Formation of 2,2,4-Trimethyl-2,3-dihydro-1H-1,5-Benzodiazepine from 1,2-Diaminobenzene in the Presence of Acetone
title_sort formation of 2,2,4-trimethyl-2,3-dihydro-1h-1,5-benzodiazepine from 1,2-diaminobenzene in the presence of acetone
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6269685/
https://www.ncbi.nlm.nih.gov/pubmed/24256923
http://dx.doi.org/10.3390/molecules181114293
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