Results 21 to 30 of about 31,425 (239)
Asymmetric Organocatalysis with Chiral Covalent Organic Frameworks
Organic Materials, 2021 Inspired by Mother Nature, the use of chiral covalent organic frameworks as heterogeneous asymmetric organocatalysts has arisen over the last decade as a new method in enantioselective synthesis.
Song-Chen Yu, Liang Cheng, Li Liu
doaj +1 more source
Concentration-Flux-Steered Mechanism Exploration with an Organocatalysis Application [PDF]
Isr. J. Chem. 63 (2023) e202200123, 2022 Investigating a reactive chemical system with automated reaction network exploration algorithms provides a more detailed picture of its chemical mechanism than what would be accessible by manual investigation. In general, exploration algorithms cannot uncover reaction networks exhaustively for feasibility reasons.
arxiv +1 more source
Molecules, 2023 In 1971, chemists from Hoffmann-La Roche and Schering AG independently discovered a new asymmetric intramolecular aldol reaction catalyzed by the natural amino acid proline, a transformation now known as the Hajos–Parrish–Eder–Sauer–Wiechert reaction ...
Arianna Quintavalla +2 more
doaj +1 more source
ScienceOpen Research, 2015 Organocatalysis, that is the use of small organic molecules to catalyse organic transformations, has been included among the most successful concepts in asymmetric catalysis and it has been used for the enantioselective construction of C-C, C-N, C-O, C-S,
Chiara Palumbo
doaj +5 more sources
Cinchona Alkaloids in Asymmetric Organocatalysis [PDF]
Synthesis, 2010 AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Marcelli, T., Hiemstra, H.
openaire +4 more sources
Synthesis and use of a stable aminal derived from TsDPEN in asymmetric organocatalysis [PDF]
, 2010 A stable aminal formed stereoselectively from (R,R)-N-tosyl-1,2-diphenyl-1,2-ethylenediamine (TsDPEN) is capable of asymmetric organocatalysis of Diels-Alder and alpha-amination reactions of ...
Clarkson, Guy J. +3 more
core +1 more source
Asymmetric Organocatalysis in Deep Eutectic Solvents
European Journal of Organic Chemistry, 2021 AbstractThe recent advances in asymmetric organocatalysis using eutectic mixtures as a reaction medium are revised in this mini‐review. In addition, the first enantioselective transformations using chiral eutectic solvents, which play the role of a green medium and organocatalyst, are described.
Diego A. Alonso +5 more
openaire +3 more sources
Asymmetric organocatalysis of the addition of acetone to 2-nitrostyrene using N-diphenylphosphinyl-1,2-diphenylethane-1,2-diamine (PODPEN) [PDF]
, 2010 The highly enantioselective addition of acetone to 2-nitrostyrene, using N–diphenylphosphinyl-trans-1,2-diphenylethane-1,2-diamine (PODPEN) as catalyst, is ...
A. Simon Partridge +53 more
core +1 more source
Kinetics and mechanism of organocatalytic aza-Michael additions: direct observation of enamine intermediates. [PDF]
, 2012 The imidazoles 1a–g add to the CC-double bond of the iminium ion 2 with rate constants as predicted by the equation log k = sN(N + E). Unfavourable proton shifts from the imidazolium unit to the enamine fragment in the adduct 3 account for the failure of
Ahrendt +33 more
core +1 more source
Organocatalytic synthesis of axially chiral atropisomers [PDF]
, 2017 This review summarises the recent progress made in the organocatalytic synthesis of atropisomeric compounds. Methodologies based on dynamic kinetic resolution and direct access to BINOL-like biaryls are described.
Renzi, P.
core +1 more source