Results 31 to 40 of about 3,038 (175)
DFT Studies on the Stereoselective Three-Component Ugi Reaction
Orbital: The Electronic Journal of Chemistry, 2019 Mechanism and stereochemistry of three component Ugi reaction (3C-Ugi) were studied theoretically based on DFT calculations. Structures of reagents, products, intermediates, and transition states were optimized at M062X/6-31+g(d,p) level of theory in gas
Elaheh Sadat Sharifzadeh +1 more
doaj +3 more sources
Beilstein Journal of Organic ChemistryA new tandem sequence involving the Ugi reaction and Diels–Alder [4 + 2] cycloaddition based on vinylfuran and 1,3-butadienylfuran derivatives was designed and studied.
Yuriy I. Horak +5 more
doaj +1 more source
Beilstein Journal of Organic Chemistry, 2019 The synthesis of a novel category of pseudo-peptides via intramolecular Ugi reaction of levulinic acid (4-oxopentanoic acid), aromatic and aliphatic amines, and amino acid-based isocyanides is reported.
Maryam Khalesi +2 more
doaj +1 more source
Chemistry – A European Journal, EarlyView.Hybrid macrocyclic peptides unite genetically encoded peptide libraries with the structural complexity of synthetic small molecules. This Review critically analyzes phage‐compatible cyclization and diversification chemistries, highlights emerging opportunities beyond traditional cysteine‐based approaches, and outlines how future advances may enable the
Titia Rixt Oppewal, Clemens Mayer
wiley +1 more source
Retro‐Hetero‐Michael Addition Strategies in Organic Synthesis
European Journal of Organic Chemistry, EarlyView.In this review, synthetic approaches to carbo‐ and heterocyclic compounds, including natural products, published in the last 15 years (2011–2025) which have either relied upon or included a retro‐hetero‐Michael addition step at any stage are discussed.
Dina Scarpi, Ernesto G. Occhiato
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 +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
Journal of Science: Advanced Materials and DevicesThis 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 +2 more
doaj +1 more source
Endoscopic features of cytomegalovirus disease of the upper gastrointestinal tract between transplant and non-transplant patients [PDF]
The Korean Journal of Internal MedicineBackground/Aims Cytomegalovirus (CMV) disease in the upper gastrointestinal (UGI) tract frequently occurs in immunocompromised patients. However, data regarding UGI CMV disease in non-transplant patients compared with those in transplant recipients are ...
Yuri Kim +10 more
doaj +1 more source
Molecules, 2022 An efficient method for the synthesis of functionalized peptidomimetics via multicomponent Ugi reaction has been developed. The application of trifluoroethanol (TFE) as a reaction medium provided desired products with good yields.
Parul Sahrawat +6 more
doaj +1 more source