The aldolreaction of hydroxyacetone with different aldehydes usingimmobilizedproline on a mesoporoussupport, assisted by heat and microwaves, has been explored. It was found that heterogenized L-proline on MCM-41 catalyzed aldolreactions in both hydrophilic and hydrophobic solvents, and provided stereoselectivities in some cases complementary to the homogeneous catalyst. The heterogeneous catalysts
Insights into Substituent Effects of Benzaldehyde Derivatives in a Heterogeneous Organocatalyzed Aldol Reaction
作者:Graziano Di Carmine、Fabio Pesciaioli、Simeng Wang、Arianna Sinibaldi、Giuliana Giorgianni、Christopher M. A. Parlett、Armando Carlone、Carmine D'Agostino
DOI:10.1002/cctc.202200405
日期:2022.7.21
heterogenous organocatalysis is undoubtedly critical to develop new and higher performing catalysts. NMR relaxation techniques provide very useful insights into adsorption effects of the aldehyde partner in an organocatalyzed aldol reaction.
Enantioselective aldol reaction of ketones with aldehydes catalyzed by (2S,5S)-pyrrolidine-2,5-dicarboxylic acid in the presence of an equal molar amount of Et3N was described. By using the new chiral organocatalyst, the direct aldol condensation products were obtained in reasonable yields and up to 90% ee. (c) 2006 Elsevier Ltd. All rights reserved.