Home  About us  Contact
 

Ugi Reaction (ugi + reaction)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

ChemInform Abstract: An Interrupted Ugi Reaction Enables the Preparation of Substituted Indoxyls and Aminoindoles.

CHEMINFORM, Issue 34 2009
John S. Jr. Schneekloth
Abstract ChemInform 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. [source]

Synthesis of 7,8-Dihydrothieno[3,,2,:4,5]pyrrolo[1,2-a]pyrazin-5(6H)-ones Using a Modification of Four-Component Ugi Reaction.

CHEMINFORM, Issue 35 2006
Alexey P. Ilyin
Abstract ChemInform 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. [source]

Use of a Design of Experiments Approach for the Optimization of a Microwave-Assisted Ugi Reaction.

CHEMINFORM, Issue 31 2004
Heather Tye
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

ChemInform Abstract: A Two-Step, One-Pot Synthesis of Diverse N-Pyruvoyl Amino Acid Derivatives Using the Ugi Reaction.

CHEMINFORM, Issue 12 2001
Masayuki Nakamura
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 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. [source]

ChemInform Abstract: "Isocyanide-Free" Ugi Reactions.

CHEMINFORM, Issue 52 2009
Laurent El Kaim
Abstract ChemInform 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. [source]

Ammonia in Ugi Reactions , Four-Component versus Six-Component Couplings.

CHEMINFORM, Issue 32 2005
Rigobert Pick
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Synthesis of Pyridodiazepinediones by Using the Ugi Multicomponent Reaction

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 28 2010
An M. Van den Bogaert
Abstract Benzodiazepines show a broad spectrum of biological activities. In an ongoing effort to extend molecular diversity in this type of systems, we developed a strategy for synthesizing3,4-dihydro-1H -pyrido[2,3- e][1,4]diazepine-2,5-dione compounds starting from 2-hydroxynicotinic acid and by using an Ugi reaction as a key step in the synthesis. We opted to use 2-isocyanophenyl benzoate instead of Armstrong's convertible isocyanide in this multicomponent reaction. [source]

ChemInform Abstract: Efficient Synthesis of Azaspirodienones by Microwave-Assisted Radical Spirocyclization of Xanthate-Containing Ugi Adducts.

CHEMINFORM, Issue 33 2010
Rocio Gamez-Montano
Abstract By use of a sequential combination of Ugi reaction and microwave-promoted radical spirocyclization, an efficient protocol for the preparation of five- and six-membered spirolactams is developed. [source]

Remarkably Slow Rotation about a Single Bond between an sp3 -Hybridised Carbon Atom and an Aromatic Ring without ortho Substituents

CHEMISTRY - A EUROPEAN JOURNAL, Issue 9 2009
Sarah Murrison
Abstract Look, noorthosubstituents! A series of polycycles were prepared by using a three-component Joullié,Ugi reaction. The rate of rotation about the bond between a highly hindered bridgehead and a phenyl ring with no ortho substituents was measured, and was highly dependent on the substitution. Rotamer half-lives of up to 21,h at 298,K were observed (see figure). Rotamers resulting from this restricted rotation were isolated for the first time. A series of polycycles was prepared by using a three-component Joullié,Ugi reaction. The rate of rotation about the bond between a highly hindered bridgehead and a phenyl ring with no ortho substituents was measured by using, in general, variable-temperature HPLC. The rate of rotation was highly dependent on substitution and rotamer half-lives of up to 21,h at 298,K were observed. Insights into the effect of substitution on the rate of rotation were gleaned through electronic structure calculations on closely related derivatives. Rotamers resulting from restricted rotation about a bond between an sp3 -hybridised carbon atom and a phenyl ring with no ortho substituents were isolated for the first time, and the equilibration of the separated rotamers was followed by using analytical HPLC. It was demonstrated, for the first time, that a highly hindered environment for the sp3 -hybridised atom is sufficient for slow bond rotation about a single bond between sp3 - and sp2 -hybridised carbon atoms. [source]