Results 71 to 80 of about 3,038 (175)

Synthesis of 4-azasteroids by an intramolecular Ugi reaction

Steroids, 2008
In this paper we report the use of an intramolecular Ugi reaction to synthesize new 4-azacholestanes diversely substituted both at N-4 and C-5. Both the scope and the stereochemical outcome of this approach were studied by varying the nature of the components necessary for this multicomponent reaction.
Alonso, Fernando, Acebedo, Sofía Lorena, Bruttomesso, Andrea, Ramirez, Javier Alberto   +3 more
openaire   +3 more sources

Convergent synthesis of 13N-labelled Peptidic structures using aqueous [13N]NH3

EJNMMI Radiopharmacy and Chemistry, 2017
Background Nitrogen-13 has a 10-min half-life which places time constraints on the complexity of viable synthetic methods for its incorporation into PET imaging agents.
Julia E. Blower, Samuel F. Cousin, Antony D. Gee   +2 more
doaj   +1 more source

Rh(III)-Catalyzed C-2 Alkylation of Indoles followed by a Post-Synthetic Modification via the Ugi Reaction. [PDF]

ChemistryOpen, 2023
Januário MAP, de Souza DP, Zukerman-Schpector J, Corrêa AG.   +3 more
europepmc   +1 more source

Ugi bisamides based on pyrrolyl-β-chlorovinylaldehyde and their unusual transformations

Beilstein Journal of Organic Chemistry
By one-pot four- and three-component Ugi reactions involving convertible isocyanides and unexplored pyrrole-containing β-chlorovinylaldehyde, a small library of 20 bisamides with unusual behavior in post-Ugi transformations was prepared and characterized.
Alexander V. Tsygankov, Vladyslav O. Vereshchak, Tetiana O. Savluk, Serhiy M. Desenko, Valeriia V. Ananieva, Oleksandr V. Buravov, Yana I. Sakhno, Svitlana V. Shishkina, Valentyn A. Chebanov   +8 more
doaj   +1 more source

Doebner-type pyrazolopyridine carboxylic acids in an Ugi four-component reaction

Beilstein Journal of Organic Chemistry, 2019
Substituted 1H-pyrazolo[3,4-b]pyridine-4- and 1H-pyrazolo[3,4-b]pyridine-6-carboxamides have been synthetized through a Doebner–Ugi multicomponent reaction sequence in a convergent and versatile manner using diversity generation strategies: combination ...
Maryna V. Murlykina, Oleksandr V. Kolomiets, Maryna M. Kornet, Yana I. Sakhno, Sergey M. Desenko, Victoriya V. Dyakonenko, Svetlana V. Shishkina, Oleksandr A. Brazhko, Vladimir I. Musatov, Alexander V. Tsygankov, Erik V. Van der Eycken, Valentyn A. Chebanov   +11 more
doaj   +1 more source

Ethyl({[acryloyl(furan-2-ylmethyl)amino]acetyl}amino)acetate

Molbank, 2017
Ethyl({[acryloyl(furan-2-ylmethyl)amino]acetyl}amino)acetate was synthesized via Ugi four component (4C) reaction at ambient temperature. The protocol employs a reaction between formaldehyde, furfurylamine, acrylic acid, and ethyl 2-isocyanoacetate.
Shimoga D. Ganesh, Nabanita Saha, Ronald N. Zuckermann, Petr Sáha   +3 more
doaj   +1 more source

Innovations and Inventions: Why Was the Ugi Reaction Discovered Only 37 Years after the Passerini Reaction? [PDF]

J Org Chem, 2023
Dömling A.
europepmc   +1 more source

Combining the Ugi-azide multicomponent reaction and rhodium(III)-catalyzed annulation for the synthesis of tetrazole-isoquinolone/pyridone hybrids

Beilstein Journal of Organic Chemistry, 2019
An efficient sequence based on the Ugi-azide reaction and rhodium(III)-catalyzed intermolecular annulation has been established for the preparation of tetrazole-isoquinolone/pyridone hybrids.
Gerardo M. Ojeda, Prabhat Ranjan, Pavel Fedoseev, Lisandra Amable, Upendra K. Sharma, Daniel G. Rivera, Erik V. Van der Eycken   +6 more
doaj   +1 more source

Synthesis of Polyheterocyclic Pyrrolo[3,4-b]pyridin-5-ones via a One-Pot (Ugi-3CR/aza Diels-Alder/N-acylation/aromatization/SN2) Process. A Suitable Alternative towards Novel Aza-Analogues of Falipamil

Molecules, 2018
We describe the one-pot synthesis of twenty polyheterocyclic pyrrolo[3,4-b]pyridin-5-ones via a cascade process (Ugi-3CR/aza Diels-Alder/N-acylation/aromatization) in 20 to 95% overall yields, as well as four pharmacologically promising analogues via an ...
Angel Zamudio-Medina, Ailyn N. García-González, Genesis K. Herrera-Carrillo, Daniel Zárate-Zárate, Adriana Benavides-Macías, Joaquín Tamariz, Ilich A. Ibarra, Alejandro Islas-Jácome, Eduardo González-Zamora   +8 more
doaj   +1 more source

Synthesis of Novel Lipophilic Polyamines via Ugi Reaction and Evaluation of Their Anticancer Activity. [PDF]

Molecules, 2022
Nichugovskiy A, Maksimova V, Trapeznikova E, Eshtukova-Shcheglova E, Ivanov I, Yakubovskaya M, Kirsanov K, Cheshkov D, Tron GC, Maslov M.   +9 more
europepmc   +1 more source