Article (Scientific journals)
Continuous flow organocatalyzed methoxycarbonylation of benzyl alcohol derivatives with dimethyl carbonate
Toupy, Thomas; Bovy, Loïc; Monbaliu, Jean-Christophe
2022In Journal of Flow Chemistry
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Keywords :
Organic Chemistry; Carbonation; Continuous Flow; Benzyl alcohol; Hydroxycarbamates
Abstract :
[en] An organocatalytic continuous flow process is presented for the preparation of non-symmetric benzyl carbonate derivatives. The procedure relies on dimethyl carbonate as a reagent and a solvent in conjunction with an organocatalyst for the selective methoxycarbonylation of diversely substituted benzylic alcohols. The reaction is optimized with benzyl alcohol as a model substrate, which emphasizes 1,4-diazabicyclo[2.2.2]octane (DABCO), 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD), 2,8,9-trimethyl-2,5,8,9-tetraaza-1-phosphabicyclo[3.3.3]undecane (Verkade’s base) and phosphazene base P2-Et as suitable organocatalysts. The optimized conditions are next extended to a small library of 18 structurally diverse benzylic alcohol derivatives. High conversion (66–96%) and total selectivity (>99%) are achieved under mild conditions and short residence time, which converge toward a versatile and robust continuous flow protocol. Then, we illustrate that a set of representative benzyl methyl carbonates can be considered as stable, low toxicity surrogates of the corresponding chloroformates for the preparation of valuable benzyl N-hydroxycarbamates.
Disciplines :
Chemistry
Author, co-author :
Toupy, Thomas ;  Université de Liège - ULiège > Molecular Systems (MolSys)
Bovy, Loïc  ;  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 :
Continuous flow organocatalyzed methoxycarbonylation of benzyl alcohol derivatives with dimethyl carbonate
Publication date :
02 March 2022
Journal title :
Journal of Flow Chemistry
ISSN :
2062-249X
eISSN :
2063-0212
Publisher :
Springer Science and Business Media LLC
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FRIA - Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture
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since 07 March 2022

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