Results 61 to 70 of about 2,875 (189)

An effective one-pot access to polynuclear dispiroheterocyclic structures comprising pyrrolidinyloxindole and imidazothiazolotriazine moieties via a 1,3-dipolar cycloaddition strategy

Beilstein Journal of Organic Chemistry, 2016
An effective and highly regio- and diastereoselective one-pot method for the synthesis of new polynuclear dispiroheterocyclic systems with five stereogenic centers (dispiro[imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-6,3′-pyrrolidine-2′,3′′-indoles ...
Alexei N. Izmest’ev, Galina A. Gazieva, Natalya V. Sigay, Sergei A. Serkov, Valentina A. Karnoukhova, Vadim V. Kachala, Alexander S. Shashkov, Igor E. Zanin, Angelina N. Kravchenko, Nina N. Makhova   +9 more
doaj   +1 more source

azomethine ylides

, 2008
Citation: 'azomethine ylides' in the IUPAC Compendium of Chemical Terminology, 3rd ed.; International Union of Pure and Applied Chemistry; 2006. Online version 3.0.1, 2019. 10.1351/goldbook.A00565 • License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International for individual terms.
openaire   +1 more source

An efficient and facile access to highly functionalized pyrrole derivatives

Beilstein Journal of Organic Chemistry, 2018
A straightforward and one-pot synthesis of pyrrolo[3,4-c]pyrrole-1,3-diones via Ag(I)-catalyzed 1,3-dipolar cycloaddition of azomethine ylides with N-alkyl maleimide, followed by readily complete oxidation with DDQ, has been successfully developed ...
Meng Gao, Wenting Zhao, Hongyi Zhao, Ziyun Lin, Dongfeng Zhang, Haihong Huang   +5 more
doaj   +1 more source

Synthesis of 2‐Fluoropyrroles via [4 + 1] Cycloaddition of α,β‐Unsaturated Imines with In Situ‐Generated Difluorocarbene

European Journal of Organic Chemistry, Volume 28, Issue 35, September 26, 2025.
2‐Fluoropyrroles are synthesized via the [4 + 1] cycloaddition of α,β‐unsaturated imines with difluorocarbene, generated in situ from trimethylsilyl 2,2‐difluoro‐2‐(fluorosulfonyl)acetate (TFDA). The α,β‐unsaturated imines are treated with TFDA in the presence of a Proton Sponge catalyst.
Kohei Fuchibe, Takaya Miura, Junji Ichikawa   +2 more
wiley   +1 more source

A Facile One-Pot Construction of Succinimide-Fused Spiro[Pyrrolidine-2,3′-Oxindoles] via 1,3-Dipolar Cycloaddition Involving 3-Amino Oxindoles and Maleimides

Molecules, 2018
Increasing interests have been invested in the development of synthetic strategies toward the construction of spiro[pyrrolidine-2,3′-oxindole], which is the core structural skeleton in some compounds with diverse biological activities.
Lunqiang Jin, Feng Liang
doaj   +1 more source

Steuerbare endo/exo‐Selektivität in direkten katalytisch‐ asymmetrischen 1,3‐dipolaren Cycloadditionen mit polyfunktionellen Lewis‐Säure‐/Azolium‐Aryloxid‐Katalysatoren

Angewandte Chemie, Volume 137, Issue 34, August 18, 2025.
Ein neuartiges Konzept für katalytische asymmetrische 1,3‐dipolare Cycloadditionen mit Iminoestern verwendet modulare polyfunktionelle Lewis‐Säure‐/Azolium‐Aryloxid‐Betain‐Katalysatoren, die die endo‐ und exo‐Selektivität durch Anpassungen des Metallzentrums, des Azoliums und der Sterik steuern. DFT‐Studien zeigen eine nahezu perfekte räumliche Passung
Adrian Bürstner, Patrick M. Becker, Alexander Allgaier, Lucca Pfitzer, Daniel M. Wanner, Johanna Dollinger, Felix Willig, Justin Herrmann, Vukoslava Miskov‐Pajic, Andreas C. Hans, Wolfgang Frey, Joris van Slageren, Johannes Kästner, René Peters   +13 more
wiley   +1 more source

Tunable Endo/Exo Selectivity in Direct Catalytic Asymmetric 1,3‐Dipolar Cycloadditions with Polyfunctional Lewis Acid / Azolium–Aryloxide Catalysts

Angewandte Chemie International Edition, Volume 64, Issue 34, August 18, 2025.
A novel concept for catalytic asymmetric 1,3‐dipolar cycloadditions with iminoesters employs modular polyfunctional Lewis acid/azolium‐aryloxide betaine catalysts, controlling endo‐ and exo‐selectivity through adjustments of metal center, azolium, and sterics.
Adrian Bürstner, Patrick M. Becker, Alexander Allgaier, Lucca Pfitzer, Daniel M. Wanner, Johanna Dollinger, Felix Willig, Justin Herrmann, Vukoslava Miskov‐Pajic, Andreas C. Hans, Wolfgang Frey, Joris van Slageren, Johannes Kästner, René Peters   +13 more
wiley   +1 more source

Thioxanthone: A Benchmark Photocatalyst for Organic Synthesis

ChemCatChem, Volume 17, Issue 16, August 18, 2025.
Thioxanthone is a highly versatile and effective organocatalyst for photochemical applications, with its low‐toxicity, metal‐free structure driving growing interest in sustainable photocatalysis. Building on our previous 2021 review, this update covers advances from 2021–2025 in thioxanthone‐based synthetic organic photochemistry – excluding ...
Vera P. Demertzidou, Elpida Skolia, Christoforos G. Kokotos   +2 more
wiley   +1 more source

Synthesis, Photophysical, and Chemiexcitation Properties of Luminol‐Fullerene Dyads: Toward Chemiexcitation Electron Transfer

Chemistry – A European Journal, Volume 31, Issue 40, July 17, 2025.
The emission properties of fullerene‐luminol dyads, following either irradiation or chemiexcitation, are evaluated. Strong luminol (chemi)luminescence quenching is partially attributed to electron transfer. Abstract Fullerene‐based donor‐acceptor (D‐A) dyads have been extensively studied for their unique electronic properties, with applications in ...
Theodoros Mikroulis, Gemma M. Rodríguez‐Muñiz, Demeter Tzeli, Georgios Rotas, Miguel A. Miranda, Georgios C. Vougioukalakis   +5 more
wiley   +1 more source

Highly Efficient Asymmetric [3+2] Cycloaddition Promoted by Chiral Aziridine-Functionalized Organophosphorus Compounds

Molecules
The asymmetric [3+2] cycloaddition of azomethine ylides generated from the corresponding imino ester-to-trans-β-nitrostyrene catalysis by chiral aziridine-containing phosphines and phosphine oxides is described. Of the sixteen stereoisomers that could be
Julia Szymańska, Michał Rachwalski, Adam M. Pieczonka   +2 more
doaj   +1 more source