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Continuous‐Flow Divergent Lithiation of 2,3‐Dihalopyridines: Deprotolithiation versus Halogen Dance

We describe herein the first halogen dance (HD) in continuous flow on 2‐chloro‐3‐bromopyridine by selectively trapping a (pyridin‐4‐yl)lithium species that is known to undergo the halogen‐dance process. In addition, this lithiated intermediate was trapped at lower temperature before the HD occurs. T...

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Autores principales: Brégent, Thibaud, Ivanova, Maria V., Poisson, Thomas, Jubault, Philippe, Legros, Julien
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10092453/
https://www.ncbi.nlm.nih.gov/pubmed/36200571
http://dx.doi.org/10.1002/chem.202202286
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author Brégent, Thibaud
Ivanova, Maria V.
Poisson, Thomas
Jubault, Philippe
Legros, Julien
author_facet Brégent, Thibaud
Ivanova, Maria V.
Poisson, Thomas
Jubault, Philippe
Legros, Julien
author_sort Brégent, Thibaud
collection PubMed
description We describe herein the first halogen dance (HD) in continuous flow on 2‐chloro‐3‐bromopyridine by selectively trapping a (pyridin‐4‐yl)lithium species that is known to undergo the halogen‐dance process. In addition, this lithiated intermediate was trapped at lower temperature before the HD occurs. The HD process was extended to fluoro‐iodopyridines by using various electrophiles to afford 28 examples with yields ranging from 42 to 97 % with very short residence times. Finally, scale up of the reaction was demonstrated, affording a promising space‐time yield (STY) of 4.2 kg.h(−1).L(−1).
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spelling pubmed-100924532023-04-13 Continuous‐Flow Divergent Lithiation of 2,3‐Dihalopyridines: Deprotolithiation versus Halogen Dance Brégent, Thibaud Ivanova, Maria V. Poisson, Thomas Jubault, Philippe Legros, Julien Chemistry Research Articles We describe herein the first halogen dance (HD) in continuous flow on 2‐chloro‐3‐bromopyridine by selectively trapping a (pyridin‐4‐yl)lithium species that is known to undergo the halogen‐dance process. In addition, this lithiated intermediate was trapped at lower temperature before the HD occurs. The HD process was extended to fluoro‐iodopyridines by using various electrophiles to afford 28 examples with yields ranging from 42 to 97 % with very short residence times. Finally, scale up of the reaction was demonstrated, affording a promising space‐time yield (STY) of 4.2 kg.h(−1).L(−1). John Wiley and Sons Inc. 2022-10-31 2022-12-20 /pmc/articles/PMC10092453/ /pubmed/36200571 http://dx.doi.org/10.1002/chem.202202286 Text en © 2022 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH https://creativecommons.org/licenses/by-nc-nd/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Research Articles
Brégent, Thibaud
Ivanova, Maria V.
Poisson, Thomas
Jubault, Philippe
Legros, Julien
Continuous‐Flow Divergent Lithiation of 2,3‐Dihalopyridines: Deprotolithiation versus Halogen Dance
title Continuous‐Flow Divergent Lithiation of 2,3‐Dihalopyridines: Deprotolithiation versus Halogen Dance
title_full Continuous‐Flow Divergent Lithiation of 2,3‐Dihalopyridines: Deprotolithiation versus Halogen Dance
title_fullStr Continuous‐Flow Divergent Lithiation of 2,3‐Dihalopyridines: Deprotolithiation versus Halogen Dance
title_full_unstemmed Continuous‐Flow Divergent Lithiation of 2,3‐Dihalopyridines: Deprotolithiation versus Halogen Dance
title_short Continuous‐Flow Divergent Lithiation of 2,3‐Dihalopyridines: Deprotolithiation versus Halogen Dance
title_sort continuous‐flow divergent lithiation of 2,3‐dihalopyridines: deprotolithiation versus halogen dance
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10092453/
https://www.ncbi.nlm.nih.gov/pubmed/36200571
http://dx.doi.org/10.1002/chem.202202286
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