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The pseudo-Michael reaction of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl ethoxymethylenecyanoacetate

ABSTRACT: The pseudo-Michael reaction of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl 2-cyano-3-methoxyprop-2-enoate (ethyl ethoxymethylenecyanoacetate) is investigated. At −10 °C reaction takes place on the exocyclic nitrogen atom, giving exclusively ethyl esters of 2-cyano-3-[(1-phenyl-4,5-d...

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Autores principales: Kaczor, Agnieszka A., Kijkowska-Murak, Urszula, Pihlaja, Kalevi, Sinkkonen, Jari, Wysocki, Waldemar, Karczmarzyk, Zbigniew, Matosiuk, Dariusz
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Vienna 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4495018/
https://www.ncbi.nlm.nih.gov/pubmed/26166883
http://dx.doi.org/10.1007/s00706-013-0982-y
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author Kaczor, Agnieszka A.
Kijkowska-Murak, Urszula
Pihlaja, Kalevi
Sinkkonen, Jari
Wysocki, Waldemar
Karczmarzyk, Zbigniew
Matosiuk, Dariusz
author_facet Kaczor, Agnieszka A.
Kijkowska-Murak, Urszula
Pihlaja, Kalevi
Sinkkonen, Jari
Wysocki, Waldemar
Karczmarzyk, Zbigniew
Matosiuk, Dariusz
author_sort Kaczor, Agnieszka A.
collection PubMed
description ABSTRACT: The pseudo-Michael reaction of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl 2-cyano-3-methoxyprop-2-enoate (ethyl ethoxymethylenecyanoacetate) is investigated. At −10 °C reaction takes place on the exocyclic nitrogen atom, giving exclusively ethyl esters of 2-cyano-3-[(1-phenyl-4,5-dihydro-1H-imidazol-2-yl)amino]prop-2-enoic acid. The formation of isomeric enamines which may be a theoretical product of the reaction on N3 ring nitrogen atom is not observed. The N6 enamines, heated in boiling acetic acid, yield cyclic 1-aryl-5-oxo-2,3-dihydroimidazo[1,2-a]pyrimidine-6-carbonitriles. Heating of the enamines to the temperature of 120–140 °C without a solvent makes it possible to obtain a mixture of 1-aryl-5-oxo-2,3-dihydroimidazo[1,2-a]pyrimidine-6-carbonitriles and ethyl 1-aryl-5-imino-2,3-dihydroimidazo[1,2-a]pyrimidine-6-carboxylates. The reaction of the respective hydrobromides of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl ethoxymethylenecyanoacetate in the presence of triethylamine gives selectively 1-aryl-5-oxo-1,2,3,5-dihydroimidazo[1,2-a]pyrimidine-6-carbonitriles. GRAPHICAL ABSTRACT: [Image: see text]
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spelling pubmed-44950182015-07-09 The pseudo-Michael reaction of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl ethoxymethylenecyanoacetate Kaczor, Agnieszka A. Kijkowska-Murak, Urszula Pihlaja, Kalevi Sinkkonen, Jari Wysocki, Waldemar Karczmarzyk, Zbigniew Matosiuk, Dariusz Monatsh Chem Original Paper ABSTRACT: The pseudo-Michael reaction of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl 2-cyano-3-methoxyprop-2-enoate (ethyl ethoxymethylenecyanoacetate) is investigated. At −10 °C reaction takes place on the exocyclic nitrogen atom, giving exclusively ethyl esters of 2-cyano-3-[(1-phenyl-4,5-dihydro-1H-imidazol-2-yl)amino]prop-2-enoic acid. The formation of isomeric enamines which may be a theoretical product of the reaction on N3 ring nitrogen atom is not observed. The N6 enamines, heated in boiling acetic acid, yield cyclic 1-aryl-5-oxo-2,3-dihydroimidazo[1,2-a]pyrimidine-6-carbonitriles. Heating of the enamines to the temperature of 120–140 °C without a solvent makes it possible to obtain a mixture of 1-aryl-5-oxo-2,3-dihydroimidazo[1,2-a]pyrimidine-6-carbonitriles and ethyl 1-aryl-5-imino-2,3-dihydroimidazo[1,2-a]pyrimidine-6-carboxylates. The reaction of the respective hydrobromides of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl ethoxymethylenecyanoacetate in the presence of triethylamine gives selectively 1-aryl-5-oxo-1,2,3,5-dihydroimidazo[1,2-a]pyrimidine-6-carbonitriles. GRAPHICAL ABSTRACT: [Image: see text] Springer Vienna 2013-05-14 2013 /pmc/articles/PMC4495018/ /pubmed/26166883 http://dx.doi.org/10.1007/s00706-013-0982-y Text en © The Author(s) 2013 https://creativecommons.org/licenses/by/2.0/ Open AccessThis article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
spellingShingle Original Paper
Kaczor, Agnieszka A.
Kijkowska-Murak, Urszula
Pihlaja, Kalevi
Sinkkonen, Jari
Wysocki, Waldemar
Karczmarzyk, Zbigniew
Matosiuk, Dariusz
The pseudo-Michael reaction of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl ethoxymethylenecyanoacetate
title The pseudo-Michael reaction of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl ethoxymethylenecyanoacetate
title_full The pseudo-Michael reaction of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl ethoxymethylenecyanoacetate
title_fullStr The pseudo-Michael reaction of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl ethoxymethylenecyanoacetate
title_full_unstemmed The pseudo-Michael reaction of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl ethoxymethylenecyanoacetate
title_short The pseudo-Michael reaction of 1-aryl-4,5-dihydro-1H-imidazol-2-amines with ethyl ethoxymethylenecyanoacetate
title_sort pseudo-michael reaction of 1-aryl-4,5-dihydro-1h-imidazol-2-amines with ethyl ethoxymethylenecyanoacetate
topic Original Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4495018/
https://www.ncbi.nlm.nih.gov/pubmed/26166883
http://dx.doi.org/10.1007/s00706-013-0982-y
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