Article (Scientific journals)
Intensified Continuous Flow Michaelis-Arbuzov Rearrangement toward Alkyl Phosphonates
Toupy, Thomas; Monbaliu, Jean-Christophe
2022In Organic Process Research and Development, 26 (2), p. 467 - 478
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Keywords :
alkyl phosphonates; continuous flow processes; in-line NMR monitoring; intensification; Michaelis−Arbuzov; α-aminophosphonic acids; Alkyl phosphonate; Competitive reactions; Continuous-flow; Phosphonates; Physical and Theoretical Chemistry; Organic Chemistry
Abstract :
[en] Herein is described the development of an intensified continuous flow process for the preparation of a library of alkyl phosphonates through a Michaelis-Arbuzov rearrangement. A careful process optimization and thorough analysis of the competitive reactions led to a very attractive protocol with unprecedented productivities (up to 4.97 kg of material per day) and a low environmental footprint with the absence of solvent, additives, catalysts, and waste. In-line low-field 31P NMR monitoring was conveniently implemented for rapid optimization and process monitoring. Two key alkyl phosphonate intermediates were also assessed for the unprecedented diazene dicarboxylate-mediated electrophilic amination under continuous flow conditions toward the α-aminophosphonic acid derivatives of Pphenylalanine and Palanine, bioisosters of the natural amino acids phenylalanine and alanine, respectively.
Disciplines :
Chemistry
Author, co-author :
Toupy, Thomas ;  Université de Liège - ULiège > Molecular Systems (MolSys)
Monbaliu, Jean-Christophe  ;  Université de Liège - ULiège > Département de chimie (sciences) > Center for Integrated Technology and Organic Synthesis
Language :
English
Title :
Intensified Continuous Flow Michaelis-Arbuzov Rearrangement toward Alkyl Phosphonates
Publication date :
08 February 2022
Journal title :
Organic Process Research and Development
ISSN :
1083-6160
eISSN :
1520-586X
Publisher :
American Chemical Society
Volume :
26
Issue :
2
Pages :
467 - 478
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture
Funding text :
This work was supported by the F.R.I.A.-FNRS (Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture, Belgium) and the University of Liège (Welcome Grant WG-13/03, JCMM). T.T. is a F.R.I.A.-FNRS PhD student fellow.
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