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Nucleophilic Catalysts (nucleophilic + catalyst)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

The Mukaiyama,Michael Addition of a ,,,-Dimethyl Substituted Silyl Ketene Acetal to ,,,-Unsaturated Ketones Using Tetra-n-butylammonium Bibenzoate as a Nucleophilic Catalyst.

CHEMINFORM, Issue 47 2003
Rudhramyna Gnaneshwar
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

A New Nucleophilic Catalyst for Kinetic Resolution of Racemic sec-Alcohols.

CHEMINFORM, Issue 12 2003
Kyu-Sung Jeong
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Chiral Ammonium Betaines as Ionic Nucleophilic Catalysts,

ANGEWANDTE CHEMIE, Issue 32 2010
Daisuke Uraguchi Dr.
Ungeahnte Qualitäten: Das chirale Ammoniumbetain 1 war als ionischer nucleophiler Katalysator in der asymmetrischen Steglich-Umlagerung erfolgreich. Die Umsetzung ergab rekordverdächtige Enantioselektivitäten und war auf vielfältige Substrate anwendbar. M.S. = Molekularsieb, Troc = 2,2,2-Trichlorethoxycarbonyl. [source]

Facile Synthesis of TMS-Protected Trifluoromethylated Alcohols Using Trifluoromethyltrimethylsilane (TMSCF3) and Various Nucleophilic Catalysts in DMF.

CHEMINFORM, Issue 1 2007
G. K. Surya Prakash
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]

ChemInform Abstract: Synthesis of C2 -Symmetric Analogues of 4-(Pyrrolidino)pyridine: New Chiral Nucleophilic Catalysts.

CHEMINFORM, Issue 9 2001
Alan C. Spivey
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]

Triphenylphosphine catalyzed formation of functionalized 2-aminothiophenes

HETEROATOM CHEMISTRY, Issue 3 2007
David Virieux
Triphenylphosphine was used as a nucleophilic catalyst in the addition,cyclization reaction of phenyl isothiocyanate with electron-deficient allenes. This strategy offers a new approach for the synthesis of 2-aminothiophenes under neutral conditions. © 2007 Wiley Periodicals, Inc. Heteroatom Chem 18:312,315, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20300 [source]

Catechol as a nucleophilic catalyst of peptide bond formation

JOURNAL OF PEPTIDE SCIENCE, Issue 1 2002
Gabriela Ivanova
Abstract The aminolysis of a mildly activated aminoacid ester, benzyloxycarbonyl- L -phenylalanine cyanomethyl ester, by glycine esters in the presence of catechol has been studied as a model of catalysis by RNA cis -vicinal-diol systems in protein biosynthesis. Catechol accelerated the aminolysis, especially in the presence of bases, probably by nucleophilic catalysis. Copyright © 2002 European Peptide Society and John Wiley & Sons, Ltd. [source]

ChemInform Abstract: DMAP-Catalyzed Cyanation of Aldehydes and Ketones with Ethyl Cyanoformate.

CHEMINFORM, Issue 40 2010
Shohei Aoki
Abstract It is successfully demonstrated that DMAP serves a nucleophilic catalyst for the cyanation of aldehydes and ketones. [source]

Synthesis of Chiral 2-Phospha[3]ferrocenophanes and their Behaviour as Organocatalysts in [3+2],Cyclization Reactions

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-12 2009
Arnaud Voituriez
Abstract Planar chiral 2-phospha[3]ferrocenophanes have been prepared via a stereoselective three-step synthesis. The key step is the lithiation of the 1,1,-disubstituted ferrocene 11 bearing (S)-2-(methoxymethyl)pyrrolidines as the chiral ortho -directing groups. The diastereoselectivity of these reactions has been mastered by an appropriate choice of the metallating agent, so as to afford a suitable access to C2 -symmetrical, tetrasubstituted ferrocenes. These compounds have been converted into the enantiomerically pure 2-phospha[3]-ferrocenophanes 16, via the corresponding acetates and their reactions with primary phosphines. Phosphines 16 have been used as nucleophilic catalysts in model cyclization reactions. Unlike 2-phospha[3]-ferrocenophanes with stereogenic ,-carbons, the planar chiral derivatives 16 proved to be suitable catalysts for these processes. Thus, for instance, phosphine 16c successfully promotes the enantioselective [3+2],annulations of allenes and enones into functionalized cyclopentenes (ees up to 96%). Among others, spirocyclic derivatives have been obtained in good yields and ees in the range 77,85%. The robustness of this catalyst has been demonstrated by recycling experiments. [source]

Enantioselective Synthesis of 4-(Dimethylamino)pyridines through a Chemical Oxidation-Enzymatic Reduction Sequence.

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 18 2006
Application in Asymmetric Catalysis
Abstract Enantiomerically pure 4-(dimethylamino)-3-(1-hydroxyalkyl)pyridines and 4-(dimethylamino)-3-[hydroxy(phenyl)methyl]pyridine have been prepared through efficient chemoenzymatic routes. For this purpose different lipases and oxidoreductases have been tested in the preparation of optically active 4-chloro derivatives and baker's yeast was found to be an excellent catalyst for the bioreductions of the corresponding ketones. Their applications as enantioselective nucleophilic catalysts have been studied, important catalytic properties were observed in the stereoselective construction of quaternary centers. [source]