Results 71 to 80 of about 14,677 (287)

Nickel-catalyzed transamidation of aliphatic amide derivatives. [PDF]

open access: yes, 2017
Transamidation, or the conversion of one amide to another, is a long-standing challenge in organic synthesis. Although notable progress has been made in the transamidation of primary amides, the transamidation of secondary amides has remained ...
Baker, Emma L   +2 more
core   +1 more source

Geminal Difunctionalization of Ketones via C─S Bond Insertion of Photogenerated Donor–Donor Diazo Compounds

open access: yesAngewandte Chemie International Edition, EarlyView.
Geminal difunctionalization of readily available building blocks provides rapid access to molecular complexity. This work introduces a strategy for installing two distinct functional groups on a carbonyl carbon by transforming it into a donor–donor diazo compound, enabling both batch and flow applications with broad solvent compatibility.
Vincent George   +13 more
wiley   +1 more source

The beauty of symmetry: siRNA phosphorodithioate modifications reduce stereocomplexity, ease analysis, and can improve in vivo potency

open access: yesMolecular Therapy: Nucleic Acids
Phosphorothioates (PSs) can be essential in stabilizing therapeutic oligonucleotides against enzymatic degradation. However, unless synthesis is performed with stereodefined amidites, each PS introduces a chemically undefined stereocenter, resulting in ...
Sophie Schöllkopf   +8 more
doaj   +1 more source

Efficient syntheses of 25,26-dihydrodictyostatin and 25,26-dihydro-6-epi-dictyostatin, two potent new microtubule-stabilizing agents

open access: yesBeilstein Journal of Organic Chemistry, 2011
The dictyostatins are powerful microtubule-stabilizing agents that have shown antiproliferative activity against a variety of human cancer cell lines.
María Jiménez   +4 more
doaj   +1 more source

Synthesis of an arginine mimic for an antifungal octapeptide library : this thesis is presented in partial fulfilment of the requirements for the degree of Master of Science in Chemistry at Massey University, Palmerston North, New Zealand [PDF]

open access: yes, 2008
A family of bioactive antifungal octapeptides has been established¹⁻³. The template for this library is based on peptides composed of two predefined amino acids, three arginines, and three unknown components. The arginine contains a guanidino group (pKa =
Sun, Hao
core  

A Catalytic, Enantioselective Formal Synthesis of (+)-Dichroanone and (+)-Taiwaniaquinone H [PDF]

open access: yes, 2014
A catalytic, enantioselective formal synthesis of (+)-dichroanone and (+)-taiwaniaquinone H is reported. The all-carbon quaternary stereocenter was constructed by asymmetric conjugate addition catalyzed by a palladium(II) (S)-tert-butylpyridinooxazoline ...
Holder, Jeffrey C.   +2 more
core   +3 more sources

Menthol-Induced Chirality in Semiconductor Nanostructures: Chiroptical Properties of Atomically Thin 2D CdSe Nanoplatelets Capped with Enantiomeric L-(−)/D-(+)-Menthyl Thioglycolates

open access: yesNanomaterials
Semiconductor colloidal nanostructures capped with chiral organic molecules are a research hotspot due to their wide range of important implications for photonic and spintronic applications.
Maria Yu. Skrypnik   +7 more
doaj   +1 more source

Photoenzymatic enantioselective synthesis of fluorinated amides with remote stereocenter

open access: yesNature Communications
Fluorinated compounds are scarce in nature, albeit they are in high demand in pharmaceuticals, agrochemicals, and materials. Fluorinated amides serve as prevalent structural motifs in pharmaceuticals and bioactive molecules.
Chaoqun Huang   +9 more
doaj   +1 more source

Stereodivergent Construction of Tertiary Fluorides in Vicinal Stereogenic Pairs by Allylic Substitution with Iridium and Copper Catalysts. [PDF]

open access: yes, 2019
Although much effort has been spent on the enantioselective synthesis of tertiary alkyl fluorides, the synthesis of compounds containing such a stereogenic center within an array of stereocenters, particularly two vicinal ones, remains a synthetic ...
Hartwig, John F   +2 more
core  

High-Throughput Screening of the Asymmetric Decarboxylative Alkylation Reaction of Enolate-Stabilized Enol Carbonates [PDF]

open access: yes, 2010
The use of high-throughput screening allowed for the optimization of reaction conditions for the palladium-catalyzed asymmetric decarboxylative alkylation reaction of enolate-stabilized enol carbonates.
McDougal, Nolan T.   +2 more
core   +2 more sources

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