Results 131 to 140 of about 3,038 (175)

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
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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
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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
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Synthesis of Thiomorpholines by an Intramolecular Ugi Reaction.

ChemInform, 2002
AbstractFor Abstract see ChemInform Abstract in Full Text.
MARCACCINI, STEFANO, PEPINO, ROBERTO, T. Torroba, D. Miguel, M. Garcìa Valverde   +4 more
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“Isocyanide-free” Ugi reactions

Organic & Biomolecular Chemistry, 2009
High-yielding Ugi reactions have been carried out with in situ-prepared isocyanides, derived from the reaction of bromide derivatives with silver and potassium cyanide, thus alleviating the burden of the preparation, purification and subsequent use of isocyanides in multicomponent reactions.
El Kaim, Laurent, Grimaud, Laurence, Schiltz, Aurelie   +2 more
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Insight into the Mechanisms of the Multicomponent Ugi and Ugi–Smiles Reactions by ESI‐MS(/MS)

European Journal of Organic Chemistry, 2014
AbstractThe mechanisms of the Ugi and Ugi–Smiles reactions were investigated by using finely selected reaction conditions that allowed all of the intermediates to be “fish‐out” and characterized by ESI‐MS/MS. New insight into the Ugi and Ugi–Smiles reaction mechanisms is provided without using charge‐tagged reagents.
IACOBUCCI, CLAUDIO, REALE, SAMANTHA, Gal, Jean François, DE ANGELIS, Francesco   +3 more
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Homologation of Ugi and Passerini reactions using ynamides

Drug Discovery Today: Technologies, 2018
Being important biological and pharmacological units, β-amino amides and β-acyloxy amides have a privileged position in both academia and industry. Developing a methods to prepare them has gained attention. Ynamides, which possess dual nucleophilic and electrophilic properties, are similar to isonitriles. In this review, usage of ynamides in the single
Bo, Huang, Sunliang, Cui
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ChemInform Abstract: Skeletal Diversity by Ugi Four‐Component Coupling Reaction and Post‐Ugi Reactions.

ChemInform, 2008
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Masato Oikawa, Shinya Naito, Makoto Sasaki   +2 more
openaire   +1 more source

New Indolizine Templates from the Ugi Reaction.

ChemInform, 2007
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
El Kaim, Laurent, Gizolme, Marie, Grimaud, Laurence   +2 more
openaire   +1 more source

Enantioselective four-component Ugi reactions

Science, 2018
A chiral organocatalyst condenses four reactants with stereochemical ...
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