Results 21 to 30 of about 14,677 (287)
Catalytic Asymmetric Synthesis of all‐Carbon Quaternary Stereocenters [PDF]
ChemInform, 2004 AbstractFor Abstract see ChemInform Abstract in Full Text.
Christopher J, Douglas, Larry E, Overman
openaire +3 more sources
Network-analysis-guided synthesis of weisaconitine D and liljestrandinine. [PDF]
, 2015 General strategies for the chemical synthesis of organic compounds, especially of architecturally complex natural products, are not easily identified. Here we present a method to establish a strategy for such syntheses, which uses network analysis.
Gallego, GM +8 more
core +2 more sources
Visible light-promoted enantioselective aerobic oxidation of pyrazolones by phase transfer catalysis
Green Synthesis and Catalysis, 2022 An efficient and enantioselective aerobic oxidation of 4-substituted pyrazolones has been developed by phase transfer catalysis. Using visible light as the driving force and O2 (in air) as the oxidant, broad scopes (38 examples) of pyrazolones bearing an
Yakun Wang +8 more
doaj +1 more source
Enantioselective Synthesis of 5-epi-Citreoviral Using Ruthenium-Catalyzed Asymmetric Ring-Closing Metathesis [PDF]
, 2009 Chiral ruthenium olefin metathesis catalysts can perform asymmetric ring-closing reactions in ≥90% ee with low catalyst loadings. To illustrate the practicality of these reactions and the products they form, an enantioselective total synthesis of 5-epi ...
Funk, Timothy W.
core +2 more sources
CHIMIA, 2008 Iridium-catalyzed enantioselective hydrogenation has become the method of choice to convert prochiral unfunctionalized olefins to optically active compounds.
Marcus G. Schrems +2 more
doaj +1 more source
Beilstein Journal of Organic Chemistry, 2021 The 9-azabicyclo[3.3.1]nonane ring system is present in several insect- and plant-derived alkaloids. (−)-Adaline (1) and (+)-euphococcinine (2), found in secretions of Coccinelid beetles, and (+)-N-methyleuphococcinine (3), isolated from the Colorado ...
Dimas J. P. Lima +3 more
doaj +1 more source
Angewandte Chemie, EarlyView.Metal‐catalyzed enantioconvergent substitutions of unactivated cyclic electrophiles by organometallic nucleophiles have not previously been reported. Herein, a chiral nickel catalyst is described that achieves this objective, coupling 3‐iodopyrrolidine derivatives with arylzinc nucleophiles.
Ting Hei Matthew Wong +2 more
wiley +2 more sources
Functionalisation of Artemisinin and Its Ring-contracted Derivatives
Molecules, 2007 Isoxazoline analogues of artemisinin were obtained in low yield and low diastereoselectivity from the 1,3-dipolar cycloaddition of nitrile oxides. Alternatively, starting from the aldehyde 7, a number of transformations - Wittig reaction and reduction ...
Wim Dehaen +2 more
doaj +1 more source
Molecules, 2022 Herein, we report the application of an efficient and practical K2CO3 promoted cascade reaction of 2-acetylbenzonitrile in the synthesis of novel 3-methylated analogs of Pazinaclone and PD172938, belonging to isoindolinones heterocyclic class bearing a ...
Antonia Di Mola +5 more
doaj +1 more source
Convergent Total Synthesis of 16β‐Hydroxylpseudobufarenogin
Angewandte Chemie, EarlyView.We present a novel convergent strategy that integrates Pd/Ag‐promoted Suzuki–Miyaura coupling with Ir‐catalyzed radical‐relay cyclization, enabling the first total synthesis of 16β‐hydroxylpseudobufarenogin. This approach is broadly applicable to the total synthesis of various oxygenated bufadienolides by simply modifying the fragment structures ...
Wataru Shigematsu +3 more
wiley +2 more sources