Results 41 to 50 of about 11,747 (233)
Synthesis of Chromeno[3,4-b]piperazines by an Enol-Ugi/Reduction/Cyclization Sequence
Molecules, 2021 Keto piperazines and aminocoumarins are privileged building blocks for the construction of geometrically constrained peptides and therefore valuable structures in drug discovery.
Ana Bornadiego +2 more
doaj +1 more source
Synthesis of novel glycopeptidomimetics via Nβ-protected- amino alkyl isonitrile based Ugi 4C reaction [PDF]
, 2013 The Ugi-4C reaction employing Nβ-protected-amino alkyl isonitrile, amino acid ester, aldehyde, and glycosyl acid has resulted in novel glycosylated peptidomimetics.
Basavaprabhu, H. +3 more
core +1 more source
Applications of the Ugi reaction with ketones [PDF]
Tetrahedron Letters, 2008 A convenient synthesis of highly functionalized, α,α-disubstituted amino acid amide derivatives has been accomplished by using cyclic and acyclic ketones as the carbonyl inputs in the Ugi multicomponent reaction. An application of this extension of the Ugi reaction to the synthesis of α,α-divinyl amino acids that may be cyclized via ring-closing ...
Suvi T M, Simila, Stephen F, Martin
openaire +2 more sources
Silver(I) triflate-catalyzed protocol for the post-ugi synthesis of spiroindolines
, 2019 A silver(I) triflate-catalyzed protocol for the post-Ugi synthesis of tetracyclic spiroindolines has been developed. The protocol worked best for indole-3-carbaldehyde-derived Ugi adducts obtained using anilines and 3-aryl propiolic acids.
Hasan, Muhammad +6 more
core +1 more source
Synthesis of Novel Diterpenic Peptides via the Ugi Reaction and Their Anticancer Activities
Molbank, 2023 Novel diterpenic peptide derivatives were synthesized via the Ugi four-component reaction at ambient temperature. The protocol employed a reaction between formaldehyde, benzyl amine, the corresponding diterpene acid, and ethyl 2-isocyanoacetate.
Anna A. Smirnova +3 more
doaj +1 more source
SynOpen, 2018 Biologically attractive azaspiro[4.5]trienones have been prepared via Ugi four-component reaction (Ugi-4CR) followed by bromine-mediated ipso-cyclization.
Saeed Balalaie +5 more
doaj +1 more source
Mechanisms of base selection by human single-stranded selective monofunctional uracil-DNA glycosylase [PDF]
, 2009 hSMUG1 (human single-stranded selective monofunctional uracil-DNA glyscosylase) is one of three glycosylases encoded within a small region of human chromosome 12. Those three glycosylases, UNG (uracil-DNA glycosylase), TDG (thymine-DNA glyscosylase), and
Agus Darwanto +63 more
core +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
Diastereoselective Ugi reaction for the synthesis of unnatural amino esters
Orbital: The Electronic Journal of Chemistry, 2012 Multicomponent Reactions (MCR) are useful reactions to obtain complex products by the simple mixture of 3 or more reactants. The classic Ugi reaction (4-UCR) involves a mixture of an amine, aldehyde, isocyanide and a carboxylic acid, giving peptoides as ...
Rafael Oliveira Rocha +4 more
doaj +1 more source
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