Results 21 to 30 of about 824,810 (240)

Hydrazones as Singular Reagents in Asymmetric Organocatalysis [PDF]

open access: yes, 2016
This Minireview summarizes strategies and developments regarding the use of hydrazones as reagents in asymmetric organocatalysis, their distinct roles in nucleophile–electrophile, cycloaddition, and cyclization reactions.
Fernández Fernández, Rosario Fátima   +4 more
core   +1 more source

Total Synthesis of Natural Terpenoids Enabled by Cobalt Catalysis

open access: yesFrontiers in Chemistry, 2022
Transition metal catalysis plays an essential role in the total synthesis of natural products. Cobalt-mediated asymmetric catalysis has successfully been used as a primary or a secondary step in the total synthesis of natural products, especially ...
Shu Xiao   +6 more
doaj   +1 more source

Non-linear Effects in Asymmetric Catalysis: Whys and Wherefores [PDF]

open access: yes, 2012
It is argued that the titled non-linear effects (NLE) may arise whenever the order of the reaction in the chiral catalyst in greater than 1. In a fundamental departure from previous approaches, this is mathematically elaborated for the second order case.
Sosale Chandrasekhar
core   +2 more sources

Influence of Phosphoramidites in Copper-Catalyzed Conjugate Borylation Reaction [PDF]

open access: yes, 2012
Copper(I) has become the preferred metal to catalyze the β-boration of α,β-unsaturated carbonyl compounds, and now we demonstrate that easily accessible monodentate chiral ligands, such as phosphoramidites and phosphites, can be convenient alternative ...
Bonet, Amadeu,   +6 more
core   +8 more sources

Kinetic Resolution in Asymmetric Epoxidation using Iminium Salt Catalysis [PDF]

open access: yes, 2013
The first reported examples of kinetic resolution in epoxidation reactions using iminium salt catalysis are described, providing up to 99% ee in the epoxidation of racemic cis ...
Allin, Steven M.   +7 more
core   +1 more source

Catalytic Asymmetric Synthesis of Chiral Covalent Organic Frameworks from Prochiral Monomers for Heterogeneous Asymmetric Catalysis.

open access: yesJournal of the American Chemical Society, 2020
Direct synthesis, post-synthetic modification and chiral induction have been recognized as three powerful methods to syn-thesize chiral covalent organic frameworks (CCOFs).
Jian-Cheng Wang   +4 more
semanticscholar   +1 more source

Enantioselective synthesis and application to the allylic imidate rearrangement of amine-coordinated palladacycle catalysts of cobalt sandwich complexes [PDF]

open access: yes, 2013
The reaction of (η5-(N,N-dimethylaminomethyl)cyclopentadien-yl)(η4-tetraphenylcyclobutadiene)cobalt with sodium tetrachloropalladate and (R)-N-acetylphenylalanine gave planar chiral palladacycle di-μ-chloridebis[(η5-(Sp)-2-(N,N-dimethylaminomethyl ...
Cassar, Doyle J.   +5 more
core   +1 more source

Synergistic Pd/Cu catalysis for stereoselective allylation of vinylethylene carbonates with glycine iminoesters: Enantioselective access to diverse trisubstituted allylic amino acid derivatives

open access: yesGreen Synthesis and Catalysis, 2021
We reported a synergistic Pd/Cu catalyzed enantioselective decarboxylative allylation of vinylethylene carbonates with glycine iminoesters, which provides facile access to non-proteinogenic diverse trisubstituted allylic amino acid derivatives in high ...
Miaolin Ke   +4 more
doaj  

Stereodivergent, Diels-Alder-initiated organocascades employing α,β-unsaturated acylammonium salts: scope, mechanism, and application. [PDF]

open access: yes, 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

Continuous-Flow Synthesis of the Nucleobase Unit of Remdesivir

open access: yesEngineering, 2023
In this work, the nucleobase unit of the antiviral drug remdesivir, 7-bromopyrrolo[2,1-f][1,2,4]triazin-4-amine, was synthesized through five-step continuous flow.
Yongxing Guo   +5 more
doaj  

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