Preparation of chitosan-supported urea materials and their application in some organocatalytic procedures
作者:Gonzalo de Gonzalo、Antonio Franconetti、Rosario Fernández、José M. Lassaletta、Francisca Cabrera-Escribano
DOI:10.1016/j.carbpol.2018.07.009
日期:2018.11
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