Prolinamides of Aminouracils, Organocatalyst Modifiable by Complementary Modules
作者:Karen M. Ruíz-Pérez、Beatriz Quiroz-García、Marcos Hernández-Rodríguez
DOI:10.1002/ejoc.201800886
日期:2018.11.8
Prolinamide organocatalysts with aminouracils have the features of enhanced NH acidity, an additional hydrogen‐bond donor and the self‐assembly with complementary modules by Watson–Crick pairing. Each module affects the selectivity of the reaction and particularly 2,6‐diaminopyridine is beneficial to the selectivity in the reaction.
Proline dipeptides containing fluorine moieties as oganocatalysts for the asymmetric aldol reaction
作者:Ardiol Ahmetlli、Nikoleta Spiliopoulou、Angeliki Magi-Oikonomopoulou、Dimitrios-Triantaffylos Gerokonstantis、Panagiota Moutevelis-Minakakis、Christoforos G. Kokotos
DOI:10.1016/j.tet.2018.08.038
日期:2018.10
demonstrated, where aromaticaldehydes afforded products in high yields (up to 100%) with excellent diastereo- (up to 95:5) and enantioselectivities (up to 97%), whereas the aliphaticaldehydes afforded also excellent selectivities, but relatively low yield. A simple addition of fluorine to a dipeptide analogue affords organocatalysts with new interesting properties that can catalyze the aldol reaction
Diastereo- and Enantioselective Direct Aldol Reactions in Aqueous Medium: A New Highly Efficient Proline-Sugar Chimeric Catalyst
作者:Silvana Pedatella、Mauro De Nisco、Domenico Mastroianni、Daniele Naviglio、Ada Nucci、Romualdo Caputo
DOI:10.1002/adsc.201100143
日期:2011.6
A new synthetic catalyst, capable of acting like an enzyme in the accomplishment of directaldolreactions, is presented. Excellent results, in terms of chemical yields and diastereo‐/enantiomeric ratios, are reported for the catalyzed additions of cyclohexanone to variously substituted benzaldehydes.
Facile one-pot fabrication of magnetic nanoparticles (MNPs)-supported organocatalysts using phosphonate as an anchor point through direct co-precipitation method
Novel MNP-supported organocatalysts were prepared by one-pot co-precipitation and surface modification using phosphonate as an anchor point, and exhibited excellent performance in aqueous asymmetric aldol reactions.
Organocatalysis in Water at Room Temperature with <i>In-Flask</i> Catalyst Recycling
作者:Bruce H. Lipshutz、Subir Ghorai
DOI:10.1021/ol203242r
日期:2012.1.6
organocatalyst, proline. This species is water-soluble and, via spontaneous nanomicelle formation, catalyzes aldol reactions on water-soluble or -insoluble substrates in water as the only medium. Recycling the catalyst is trivial, as the amphiphile/catalyst remains in the aqueous phase in the flask.