Results 161 to 170 of about 4,769 (209)

NMR-Based Structural Analysis of Highly Substituted Pyridines From Kondrat'eva Aza-Diels-Alder Cycloadditions. [PDF]

Magn Reson Chem
Suárez-Moreno GV, Méndez F, Gutierrez-Carrillo A, Rincón-Guevara MA, Amador-Sánchez YA, Islas-Jácome A, González-Zamora E.   +6 more
europepmc   +1 more source

LOw-Dose RAbeprazole Therapy for Reducing Gastrointestinal Events in Patients with High Bleeding Risk (LORA-HBR): A Prospective, Multicenter, Interventional Study. [PDF]

J Clin Med
Kang DO, Choi CU, Lee JH, Hong YJ, Kim JS, Lee HC, Rhew JY, Cho JH, Kim W.   +8 more
europepmc   +1 more source

Versatile Protecting-Group Free Tetrazolomethane Amine Synthesis by Ugi Reaction [PDF]

ACS Combinatorial Science, 2016
The use of ammonia in the Ugi reaction is often problematic due to low yields and multiple side reactions. Here, we report the use of ammonia in the tetrazole Ugi variation providing a clean, good-to-high yielding reaction, especially with ketones as oxo
Pravin Patil, Katarzyna Kurpiewska, Justyna Kalinowska-Tłuścik   +2 more
exaly   +2 more sources

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Cyclic Imines in Ugi and Ugi-Type Reactions

ACS Combinatorial Science, 2020
Ugi four-component reactions (U-4CRs) are widely recognized as being highly efficient for the synthesis of pseudopeptides. However, the products of these reactions are not so interesting as drug candidates because they are not conformationally restricted enough for a potent interaction with biological targets.
Mohammad Taghi Nazeri, Hassan Farhid, Reza Mohammadian, Ahmad Shaabani   +3 more
openaire   +2 more sources

An Ugi Reaction in the Total Synthesis of (−)‐Dysibetaine

Angewandte Chemie - International Edition, 2009
AbstractEinen einfachen Zugang zu (−)‐Dysibetain bietet eine elfstufige Reaktion ausgehend von L‐Äpfelsäure (siehe Schema). Der Schlüsselschritt ist eine einzigartige Vier‐Zentren‐drei‐Komponenten‐Ugi‐Cyclisierung, bei der eine Estereinheit als Carbonsäurekomponente fungiert.
Yoshihisa Kobayashi
exaly   +3 more sources

Ugi Reaction with Isocyanoindoles.

ChemInform, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
M. A. Mironov, M. I. Tokareva, M. N. Ivantsova, V. S. Mokrushin   +3 more
openaire   +1 more source

Seven-component reactions by sequential chemoselective Ugi–Mumm/Ugi–Smiles reactions

Chemical Communications, 2010
A seven-component reaction was accomplished by utilizing the different chemoselectivities of the Ugi-Mumm and the Ugi-Smiles reaction. The sequential multicomponent reactions led to highly diverse peptide and glycopeptide like structures.
Sebastian, Brauch, Lars, Gabriel, Bernhard, Westermann   +2 more
openaire   +2 more sources

Repetitive Ugi reactions

Tetrahedron, 2001
Abstract A variety of hydantoinimide and tetrazole derivatives was prepared by combining two different Ugi reactions (U-4CRs) in solid and liquid phases.
Friederike Constabel, Ivar Ugi
openaire   +1 more source

Skeletal Diversity by Ugi Four-Component Coupling Reaction and Post-Ugi Reactions

HETEROCYCLES, 2007
Here we report a strategy to alter the skeletal complexity of Ugi four-component coupling reaction products by using allylations followed by ring-closing metathesis. Principal component analysis is also performed for these compounds.
Masato Oikawa, Shinya Naito, Makoto Sasaki   +2 more
openaire   +1 more source