Results 51 to 60 of about 10,956 (235)
N-heterocyclic germylenes: structural characterisation of some heavy analogues of the ubiquitous N-heterocyclic carbenes [PDF]
, 2019 The X-ray crystal structures of three N-heterocyclic germylenes (NHGes) have been elucidated including the previously unknown 1,3-bis(2,6-dimethylphenyl)diazagermol-2-ylidene (1).
Dodds, Christopher A. +2 more
core +2 more sources
Angewandte Chemie, EarlyView.Substrate preorganization is used to overcome the concentration and lifetime constraints of photoredox catalysis. Pt12L24 nanospheres equipped with guanidinium moieties (LGua) are able to preorganize carboxylic acids and act as photocatalysts for the decarboxylative oxygenation reaction.
Rens Ham +2 more
wiley +2 more sources
Organocatalysis in total synthesis [PDF]
, 2015 Peer ...
Herrera, Raquel P. +1 more
core +2 more sources
Stereodivergent, Diels-Alder-initiated organocascades employing α,β-unsaturated acylammonium salts: scope, mechanism, and application. [PDF]
, 2017 Chiral α,β-unsaturated acylammonium salts are novel dienophiles enabling enantioselective Diels-Alder-lactonization (DAL) organocascades leading to cis- and trans-fused, bicyclic γ- and δ-lactones from readily prepared dienes, commodity acid chlorides ...
Abbasov, Mikail E +3 more
core +2 more sources
Do We Need Asymmetric Organocatalysis?
CHIMIA, 2007 Asymmetric organocatalysis is a 'fast lane' of the chemical highway: the progress in the last decade is simply spectacular. This introductory article summarizes basic principles, historical background, and discusses basic catalyst classes and ...
Peter I. Dalko
doaj +1 more source
Nature Communications, 2022 Nitriles have proven to be useful functional groups in pharmaceuticals and polymers, both as active moieties themselves or as easy precursors to further transformations, but synthesis of benzonitriles with axial chirality has often been difficult.
Ya Lv +5 more
doaj +1 more source
Development of a general, enantioselective organocatalytic Mukaiyama-Michael reaction with α,β-unsaturated aldehydes [PDF]
, 2009 LUMO-lowering organocatalysis has been extended to promote the conjugate addition of S-alkyl and 1-pyrrolyl silylketene acetals to α,β-unsaturated aldehydes, yielding both, syn and anti Mukaiyama–Michael products with high levels of enantioselectivity ...
Borths, Christopher J. +2 more
core +1 more source
Advanced Synthesis &Catalysis, EarlyView.Abstract Herein, we present the first light‐mediated, diastereoselective de novo synthesis for 2,3‐substituted indolines, a privileged scaffold in pharmaceuticals. The protocol was tested with various aryl and alkyl groups, maintaining high yields up to 85% across different substituents.
Julian J. Melder +7 more
wiley +1 more source
Organocatalytic C─O Bond Cleavage and Asymmetric Transformations via [1,3]‐Sigmatropic Rearrangement
Advanced Science, EarlyView.A direct asymmetric strategy for fulfilling the functional group transfer by aryl ether cleavage and migration is developed, representing the first Brønsted base‐catalyzed asymmetric [1,3]‐sigmatropic rearrangement reaction. The resulting chiral benzofuran products generated through this strategy exhibit significant 3D‐dimensionality and demonstrate ...
Lei Peng +7 more
wiley +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