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Hydroxy Esters (hydroxy + ester)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

Kinetic Resolution of Quaternary and Tertiary ,-Hydroxy Esters,

ANGEWANDTE CHEMIE, Issue 44 2009
Derek
Einfach selektiv: In Gegenwart von (1S,2R)- N -methylephedrin gelingt die Racematspaltung von tertiären und sekundären Alkoholen, die bei Aldoladditionen mit Ketonen und Aldehyden entstehen (siehe Beispiel). Die Methode ist einfach ausführbar und leicht auf einen größeren Maßstab zu übertragen, und sie liefert tertiäre und sekundäre Alkohole mit hohen Enantiomerenverhältnissen. [source]

ChemInform Abstract: A Rapid and Green Approach to Chiral ,-Hydroxy Esters: Asymmetric Transfer Hydrogenation (ATH) of ,-Keto Esters in Water by Use of Surfactants.

CHEMINFORM, Issue 8 2010
Lu Yin
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: A Novel One-Pot Procedure for the Stereoselective Synthesis of ,-Hydroxy Esters from Orthoesters.

CHEMINFORM, Issue 6 2010
Matthias Breuning
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: Kinetic Resolution of ,-Chromenyl-,-Hydroxy Esters for Asymmetric Preparation of Flavene Derivatives.

CHEMINFORM, Issue 39 2009
Dajung Kim
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]

,-Hydroxy Esters via Enantioselective Hydrogen-Mediated C,C Coupling: Regiocontrolled Reactions of Silyl-Substituted 1,3-Diynes.

CHEMINFORM, Issue 51 2006
Chang-Woo Cho
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]

Synthesis of ,-Hydroxy Esters Using Highly Active Manganese.

CHEMINFORM, Issue 23 2004
YoungSung Suh
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

ChemInform Abstract: Enzymatic Kinetic Resolution and Chemoenzymatic Dynamic Kinetic Resolution of ,-Hydroxy Esters.

CHEMINFORM, Issue 29 2002
-Lactones., An Efficient Route to Chiral
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: Highly Efficient and Stereoselective Route to threo- and erythro-,-Allylated ,-Fluoro-,-hydroxy Esters via Radical Allylation Reaction.

CHEMINFORM, Issue 33 2002
Takashi Ishihara
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: Highly Stereoselective Radical Reduction of ,-Bromo-,-fluoro-,-hydroxy Esters with Tributyltin Hydride Leading to threo-,Fluoro-,-hydroxy Esters.

CHEMINFORM, Issue 27 2002
Kazuhide Mima
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: The Asymmetric Synthesis of ,-Aryl-,-hydroxy Esters from ,-Aryl-,,,-dihydroxy Esters.

CHEMINFORM, Issue 27 2002
Nicholas J. Lawrence
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]

A Practical Method for Selective Cleavage of a tert -Butoxycarbamoyl N -Protective Group from N,N -Diprotected ,-Amino Acid Derivatives Using Montmorillonite K-10,

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 30 2007
J. Nicolás Hernández
Abstract A new, practical, and mild procedure for the selective cleavage of a tert -butoxycarbonyl group (Boc) in N -Boc- N -acyl-diprotected amines is described. When applied to ,-amino acids, complete integrity of the stereochemistry was observed. The use of N,N -di-Boc-,-amino-,- and ,-hydroxy esters provided both ,- and ,-lactones in very good yields. The method is based on the use of Montmorillonite K-10 either in CH2Cl2 at room temperature or in toluene at 65 °C and is compatible with the presence of a large range of functional and other protecting groups in the substrates. In most cases virtually pure samples are obtained after filtration and removal of solvents. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007) [source]

Pentafluorophenylammonium Trifluoromethanesulfonimide: Mild, Powerful, and Robust Catalyst for Mukaiyama Aldol and Mannich Reactions between Ketene Silyl Acetals and Ketones or Oxime Ethers

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 7 2010
Ryohei Nagase
Abstract Pentafluorophenylammonium trifluoromethanesulfonimide (C6F5N+H3,NTf2,) promotes Mukaiyama aldol and Mannich reactions using ketene silyl acetals with ketones and oxime ethers, respectively. The present robust method is mild, but powerful enough to utilize less accessible electrophiles such as enolizable ketones and oxime ethers to produce a variety of ,-hydroxy esters and ,-alkoxyamino esters, respectively. Mechanistic investigation revealed in situ generation of trimethylsilyl bistriflimide [Tf2N(TMS)], the truly active catalyst, which was supported by rational 1H,NMR measurements. [source]

The Rhodium-Catalyzed Carbene Cyclization Cycloaddition Cascade Reaction of Vinylsulfonates

ADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 18 2009
Bairu Shi
Abstract Vinylsulfonates have proved to be excellent dipolarophiles for carbonyl ylides derived from diazoketones in rhodium-catalyzed intramolecular cycloadditions. Polyfunctional substrates, such as 8 and (+)- 15, were readily available from hydroxy esters, e.g. 1 and the cyclopenta-1,3-dione 10, respectively, and the resulting polycyclic sultones were formed under mild reaction conditions in high yields with very good diastereoselectivities. A ruthenium-catalyzed asymmetric transfer hydrogenation was found to desymmetrize the meso -cyclopenta-1,3-dione 12 efficiently. [source]

Synthesis and NMR spectroscopic studies of optically active derivatives of ,-aminobutenoic acids and 2-amino-pyrrolin-4-ones

JOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 4 2001
Margarita Petroliagi
An efficient method for the preparation of optically active derivatives of ,-amino-butenoic acids and their cyclic derivatives, 2-amino-pyrrolin-4-ones, from ,-amino acids is described. Partial racemization accompanies the formation of initial unsaturated ,-amino-,-hydroxy esters 5,8, as determined by chiral HPLC. [source]

ChemInform Abstract: Pentafluorophenylammonium Trifluoromethanesulfonimide: Mild, Powerful, and Robust Catalyst for Mukaiyama Aldol and Mannich Reactions Between Ketene Silyl Acetals and Ketones or Oxime Ethers.

CHEMINFORM, Issue 38 2010
Ryohei Nagase
Abstract The catalyst allows facile access to ,-hydroxy esters, ,-amino esters, and 5-oxo esters. [source]