Results 51 to 60 of about 4,769 (209)

Design, Synthesis, and Photophysical Studies of Functionalized Polyaromatic Isonitriles as Visible Light Photoredox Catalysts

European Journal of Organic Chemistry, EarlyView.
A new series of structurally rich polyaromatic isonitriles is presented as photoredox catalysts. Their photophysical properties are investigated by UV–Vis absorption and fluorescence measurements, combined with experimental and theoretical studies to evaluate both ground‐ and excited‐state redox properties.
Cristina Martini, Camilla Russo, Jussara Amato, Carmine Volpe, Francesca Brunelli, Laurence Grimaud, Maxime R. Vitale, Greta Donati, Andrea Basso, Mariateresa Giustiniano   +9 more
wiley   +1 more source

Substituent Effects in Ugi–Smiles Reactions

The Journal of Physical Chemistry A, 2013
In a recent communication, we described the mechanism of the well-known Ugi-type reactions with a model system (J. Org. Chem. 2012, 77, 1361-1366). Herein, focusing on the Ugi-Smiles coupling, we study the effects of each of the four reactants on the energy profile to further explain the experimental results.
Chéron, Nicolas, Ramozzi, Romain, El Kaim, Laurent, Grimaud, Laurence, Fleurat-Lessard, Paul   +4 more
openaire   +3 more sources

The Catalytic Enantioselective Ugi Four‐Component Reactions [PDF]

Angewandte Chemie International Edition, 2018
Finally stereoselective: Enantioselective variations have been developed for many multicomponent reactions; however, it has been missing for the Ugi four-component reaction. This has now changed with the discovery of an efficient catalytic enantioselective variant for the four-component reaction of isocyanides, primary amines, aldehydes or ketones, and
Shabnam Shaabani, Alexander Dömling
openaire   +2 more sources

Ugi-Functionalized Magnetic Carbon Quantum Dots: an Efficient and Environmentally Friendly Catalyst for the Synthesis of 1,4-Dihydropyridines

Journal of Science: Advanced Materials and Devices
This research presents the synthesis of Ugi-modified magnetic carbon quantum dots (MCQD-AP-Ugi) via a one-pot process to improve functionality. For the first time, the Ugi reaction was utilized to modify the surface of carbon quantum dots (CQDs), thereby
Faezeh Montazeri, Robabeh Baharfar, Behrooz Maleki   +2 more
doaj   +1 more source

Post-Ugi Cyclization for the Construction of Diverse Heterocyclic Compounds: Recent Updates

Frontiers in Chemistry, 2018
Multicomponent reactions (MCRs) have proved as a valuable tool for organic and medicinal chemist because of their ability to introduce a large degree of chemical diversity in the product in a single step and with high atom economy.
Jitender Bariwal, Rupinder Kaur, Leonid G. Voskressensky, Erik V. Van der Eycken, Erik V. Van der Eycken   +4 more
doaj   +1 more source

Microwave-assisted efficient and facile synthesis of tetramic acid derivatives via a one-pot post-Ugi cascade reaction

Beilstein Journal of Organic Chemistry, 2020
A facile microwave-assisted method for the synthesis of tetramic acid derivatives has been developed through an Ugi/Dieckmann cyclization strategy with DBU.
Yong Li, Zheng Huang, Jia Xu, Yong Ding, Dian-Yong Tang, Jie Lei, Hong-yu Li, Zhong-Zhu Chen, Zhi-Gang Xu   +8 more
doaj   +1 more source

Synthesis of Oxazolyl‐Piperidines Bearing a Quaternary Stereocenter Through a Multicomponent Reaction Involving α‐Isocyanoacetates and Piperidones

European Journal of Organic Chemistry, EarlyView.
Straightforward access to oxazole‐containing piperidines through a multicomponent reaction from α‐isocyanoacetates is described. By expanding the reactivity of these a‐isocyanoacetates from aldehydes to ketones, this process efficiently delivers oxazolyl‐piperidines bearing a quaternary stereocenter as valuable scaffolds relevant to drug discovery. The
Roshan Chandrakant Kajare, Gilles Argouarch, Nicolas Gouault, Claudia Lalli   +3 more
wiley   +1 more source

1,3,4-Oxadiazoles by Ugi-Tetrazole and Huisgen Reaction [PDF]

Organic Letters, 2019
Easy to perform, functional group tolerant, and short syntheses of the privileged scaffold oxadiazole are highly desired. Here, a metal-free protocol for MCR-based synthesis of 2,5-disubstituted 1,3,4-oxadiazoles via a Ugi-tetrazole/Huisgen sequence was developed.
Qian Wang, Kumchok C. Mgimpatsang, Markella Konstantinidou, Svitlana V. Shishkina, Alexander Dömling   +4 more
openaire   +3 more sources

Predictive Value of Nutrition Indices in Advanced Hepatocellular Carcinoma Patients Treated With Lenvatinib

The Kaohsiung Journal of Medical Sciences, EarlyView.
ABSTRACT The prognostic nutritional index (PNI) and geriatric nutritional risk index (GNRI) are simple markers that reflect immune and nutritional status. This retrospective study evaluated their prognostic significance in 276 patients with advanced hepatocellular carcinoma (HCC) who received first‐line lenvatinib. PNI and GNRI were calculated based on
Cheng‐Wei Kuo, Wei‐Chen Tai, Yen‐Hao Chen, Ming‐Chao Tsai, Jing‐Houng Wang, Sheng‐Nan Lu, Tsung‐Hui Hu, Chao‐Hung Hung, Chien‐Hung Chen, Yuan‐Hung Kuo   +9 more
wiley   +1 more source

A personal 360° view of applications of ‘biomimetic’ molecular recognition

Journal of Chemical Technology &Biotechnology, Volume 101, Issue 7, Page 1300-1311, July 2026.
Abstract Molecular recognition between biological molecules has formed the basis for innumerable applications in biotechnology for the last seven decades or so. Techniques such as affinity chromatography, solid‐phase and aqueous two‐phase extraction, affinity precipitation, biomimetic catalytic systems, biosensors and molecular imprinting all exploit ...
Christopher R Lowe
wiley   +1 more source