نتایج جستجو برای: organocatalysis

تعداد نتایج: 465  

Journal: :Molecules 2016
Anna Maria Pia Salvo Francesco Giacalone Michelangelo Gruttadauria

In this review, the most recent advances (2014-2016) on the synthesis of new polymer-supported catalysts are reported, focusing the attention on the synthetic strategies developed for their preparation. The polymer-supported catalysts examined will be organic-based polymers and organic-inorganic hybrids and will include, among others, polystyrenes, poly-ionic liquids, chiral ionic polymers, den...

2014
Alfredo Ricci

The application of the most representative and up-to-date examples of homogeneous asymmetric organocatalysis to the synthesis of molecules of interest in medicinal chemistry is reported. The use of different types of organocatalysts operative via noncovalent and covalent interactions is critically reviewed and the possibility of running some of these reactions on large or industrial scale is de...

Journal: :Angewandte Chemie 2023

Dual nucleophilic phosphine photoredox catalysis is yet to be developed due facile oxidation of the organocatalyst phosphoranyl radical cation. Herein, we report a reaction design that avoids this event and exploits traditional organocatalysis with allow Giese coupling ynoates. The approach has good generality, while its mechanism supported by cyclic voltametric, Stern–Volmer quenching, interce...

Journal: :Beilstein Journal of Organic Chemistry 2013

Journal: :Journal of the American Chemical Society 2009
Jonathan E Wilson Anthony D Casarez David W C MacMillan

The first enantioselective organocatalytic alpha-nitroalkylation of aldehydes has been accomplished. The aforementioned process involves the oxidative coupling of an enamine intermediate, generated transiently via condensation of an amine catalyst with an aldehyde, with a silyl nitronate to produce a beta-nitroaldehyde. Two methods, one that furnishes the syn beta-nitroaldehyde and a second tha...

2012
Vittorio Lucchini Marco Noè Maurizio Selva Massimo Fabris Alvise Perosa

The anionic and the cationic partners of ionic liquids may act cooperatively and independently as nucleophilic and electrophilic catalysts. This ambiphilic propensity was demonstrated by kinetically discriminating the contributions of the anion (nucleophilic catalyst) and of the cation (electrophilic catalyst) to the solvent-free Baylis– Hillman dimerization of cyclohexenone catalysed by ionic ...

2009
Matthias Breuning Tobias Häuser Christian Mehler Christian Däschlein Carsten Strohmann Andreas Oechsner Holger Braunschweig

An enantioselective route to four tricyclic amino acids and N-tosylamides, composed of a central norbornane framework with a 2-endo,3-endo-annelated pyrrolidine ring and a 5-endo-C₁ or -C₂ side chain, has been developed. A key intermediate was the chiral, N-Boc-protected ketone (1R,2S,6S,7R)-4-azatricyclo[5.2.1.0²,⁶]decan-8-one, available from inexpensive endo-carbic anhydride in five steps and...

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