Results 91 to 100 of about 23,776 (268)
Diastereoselective congested β-amido ketone synthesis via NHC-catalyzed radical–radical coupling
, 2023 N-Heterocyclic carbene catalysis merging with photoredox PCET enabled amidoacylation of alkenes to construct sterically congested cyclic β-amido ketone skeleton bearing α-tertiary or quaternary carbon centers with high diastereoselectivity.
Takanori , Matsui +4 more
core +1 more source
N‐Aryl Acridone Derivatives as Effective Catalysts for Energy Transfer Reactions
Chemistry – A European Journal, EarlyView.Acridones derivatives have high triplet energy, are simple accessible, and could be used in challenging [2+2] ENT reactions. ABSTRACT Organic photocatalysts capable of promoting high‐energy triplet energy transfer (EnT) remain limited, particularly for demanding [2+2] photocycloaddition reactions.
Francesco Calogero +8 more
wiley +1 more source
Computational ligand design in enantio- and diastereoselective ynamide [5+2] cycloisomerization
Nature Communications, 2016 Using a chiral catalyst to override the innate stereochemical outcome of a diastereoselective process is a challenging task. Here, the authors use theory and experiment to develop a cycloisomerization where the enantioselectivity is driven by the ...
R. N. Straker +4 more
doaj +1 more source
Highly Diastereoselective Alkylation of 3-Substituted Tetrahydroisoquinolines
, 2016 Highly Diastereoselective Alkylation of 3-Substituted ...
Sabine Laschat (1642789) +3 more
core +1 more source
Flipping the Card With Enantiodivergent Organocatalysis
Chemistry – A European Journal, EarlyView.This minireview elaborates on recent organocatalytic strategies for achieving enantiodivergence—the ability to access both product enantiomers using a single chiral catalyst. It highlights how achiral stimuli, such as solvent polarity and chemical additives, along with minimal catalyst modifications, trigger stereochemical inversions in reactions ...
Debora Iapadre +3 more
wiley +1 more source
CHIMIA, 1992 Bicyclooctanone (±)-2, an advanced intermediate for the synthesis of (±)-coriolin, has been synthesized in ten steps starting from 2,2-dimethylpent-4-enal (7). The key step 6 ?
Wolfgang Oppolzer, Akira Ando
doaj +2 more sources
CHIMIA, 1991 The 2-Phenyl-dioxinones 1 and 2 are resolved on cellulose-triacetate columns (medium pressure, eluent MeOH, separation factors ? = 2.0–2.3, injection of g amounts).
Dieter Seebach +2 more
doaj +2 more sources
Brønsted-Acid Catalyzed Diastereoselective Synthesis of Spiroisoindolinones from Enamides
A highly diastereoselective synthesis of spiroisoindolinones from enamides and 3-hydroxy-isoindolinones is reported. The reaction proceeds rapidly in the presence of para-toluenesulfonic acid as Brønsted acid-catalyst and affords a variety of densely ...
Miro , Halaczkiewicz +3 more
core +1 more source
Chemistry – A European Journal, EarlyView.An Artificial metalloenzyme was designed by a Michael addition between a MnSalen complex and a cysteine residue within NikA crystals. The heterogeneous catalyst was found capable of an enantioselective and stereospecific epoxidation of cis‐β‐methylstyrene in cristallo.
Manel Boukhallat +8 more
wiley +1 more source
Titanium‐Catalyzed Diastereoselective Keto‐ and Iminonitrile Cyclizations
Chemistry – A European Journal, EarlyView.The titanium(III)‐catalyzed diastereoselective cyclization of readily‐available substituted ketonitriles gives cyclopentanones in good yield and stereoselectivity. Subsequent 1,2‐addition allows the preparation of cyclopentyls with three consecutive stereocenters.
Christoph Kern +4 more
wiley +1 more source