Artículo
Preparation of Chitosan-supported Urea Materials and their Application in Some Organocatalytic Procedures
Autor/es | Gonzalo Calvo, Gonzalo de
Franconetti García, Antonio Fernández Fernández, Rosario Fátima Lassaletta, José M. Cabrera Escribano, Francisca |
Departamento | Universidad de Sevilla. Departamento de Química orgánica |
Fecha de publicación | 2018 |
Fecha de depósito | 2022-12-16 |
Publicado en |
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Resumen | An efficient and mild procedure was developed for the preparation of three chitosan-supported ureas containing electron-withdrawing groups. These catalysts were characterized and employed as organocatalysts in different ... An efficient and mild procedure was developed for the preparation of three chitosan-supported ureas containing electron-withdrawing groups. These catalysts were characterized and employed as organocatalysts in different transformations, including the enantioselective cyanosilylation of α-ketoesters and aldehydes, the asymmetric addition of formaldehyde tert-butyl hydrazone to prochiral α-ketoesters and a Friedel-Crafts reaction. Several parameters that can affect the activity and selectivity of the reactions were analysed. The supported catalysts can be reused for more than 10 cycles with only a small loss in their properties. Finally, theoretical DFT calculations were carried out to interpret the results of the catalysed reactions. |
Agencias financiadoras | Junta de Andalucía Ministerio de Economía y Competitividad (MINECO). España |
Identificador del proyecto | FQM 142
FQM 263 P09-AGR-4597 2012/FQM 10,787 CTQ2016-78703-P CTQ2016-76908-C2-1,2-P |
Cita | Gonzalo Calvo, G.d., Franconetti García, A., Fernández Fernández, R.F., Lassaletta, J.M. y Cabrera Escribano, F. (2018). Preparation of Chitosan-supported Urea Materials and their Application in Some Organocatalytic Procedures. Carbohydrate Polymers, 199, 365-374. https://doi.org/10.1016/j.carbpol.2018.07.009. |
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