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Highly Stereoselective Synthesis (highly + stereoselective_synthesis)
Selected AbstractsChemInform Abstract: Efficient Rhodium-Catalyzed Conjugate Addition of Arylboronic Acids to Unsaturated Furano Esters for the Highly Stereoselective Synthesis of Four Natural Trisubstituted Furanolignans.CHEMINFORM, Issue 3 2010Aurelie Mondiere 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 Synthesis of (Z,E)-1-Halo-1,3-dienol Esters via Rearrangement of Fischer Chromium Chlorocarbenes Using Microwave Irradiation.CHEMINFORM, Issue 37 2009Dhurke Kashinath 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] Simple Approach to the Highly Stereoselective Synthesis of trans-1,2-Cyclopropane Derivatives.CHEMINFORM, Issue 49 2007Hui Zhang 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] A Novel Highly Stereoselective Synthesis of 2,3-Disubstituted 3H-Quinazoline-4-one Derivatives.CHEMINFORM, Issue 33 2007Paul Zhichkin 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] Hydrogen-Bond-Directed Highly Stereoselective Synthesis of (Z)-Enamides via Pd-Catalyzed Oxidative Amidation of Conjugated Olefins.CHEMINFORM, Issue 5 2007Ji Min Lee 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] An Efficient and Highly Stereoselective Synthesis of New P-Chiral 1,5-Diphosphanylferrocene Ligands and Their Use in Enantioselective Hydrogenation.CHEMINFORM, Issue 47 2006Weiping Chen 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] Sequential Olefinations on 2-Arylmethylidene-2-phosphonoacetates: A One-Pot Highly Stereoselective Synthesis of 1,2,3-Trisubstituted 1,3-Butadienes.CHEMINFORM, Issue 12 2005Sonali M. Date Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: A Highly Stereoselective Synthesis of ,,,-Unsaturated Oxazolines.CHEMINFORM, Issue 11 2002Vito Capriati 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 Synthesis of Dialkyl 2-Alkylidene Glutarates.CHEMINFORM, Issue 48 2001Ali Samarat 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] Simple Approach to the Highly Stereoselective Synthesis of trans -1,2-Cyclopropane DerivativesCHINESE JOURNAL OF CHEMISTRY, Issue 8 2007Hui Zhang Abstract In the presence of KF·2H2O, furoylmethyltriphenylarsonium bromide (1a) or thienoylmethyltriphenylarsonium bromide (1b) reacted with 2-[(un)substituted benzylidene]malononitrile (2) in chloroform at room temperature to give trans -3,3-dicyano-1-furoyl-2-[(un)substituted phenyl]cyclopropane (3a) or trans -3,3-dicyano-1-thienoyl-2-[(un)substituted phenyl]cyclopropane (3b) respectively in good yield with high stereoselectivity. The structures of product 3 were confirmed by IR, MS, 1H NMR, 1H- 1H COSY and microanalysis. The relative configuration of product 3 was determined by 1H- 1H NOESY technique. The mechanism for the formation of product 3 was also proposed. [source] Highly stereoselective synthesis of cyclopropyl heterocycles via cyclopropanation of olefin with arsonium saltJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 1 2008Zhongjiao Ren An efficient and highly stereoselective approach for the preparation of highly functionalized cyclopropyl heterocycles via the cyclopropanation of olefines with arsonium salts in the presence of KF2H2O has been developed. [source] Synthesis of Substituted , -(Hydroxymethyl)- , -iodoacrylates via MgI2 -Promoted Stereoselective Aldol CouplingHELVETICA CHIMICA ACTA, Issue 9 2004Han-Xun Wei The efficient and highly stereoselective syntheses of a variety of (Z)-configured, substituted , -(hydroxymethyl) - , -iodo-acrylates from prop-2-ynoate and various aldehydes was achieved. The synthetic protocol involves a simple one-pot coupling reaction under mild conditions, promoted by MgI2, which serves both as a Lewis acid and iodine source for a BaylisHillman -type reaction. All adducts were generated in good-to-excellent yields, the (Z)-isomers being formed in high selectivity (>98%). The conversion of methyl prop-2-ynoate into an active ,, -iodo allenolate' intermediate, which then nucleophilically attacks an aldehyde, is proposed as a plausible reaction mechanism. [source] Sequential Double Olefination of 2-(Arylmethylidene)-2-phosphonoacetonitrile with Dimsyl Lithium and Aldehydes: A Domino Route to Densely Substituted 1,3-ButadienesEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 22 2008Raghunath Chowdhury Abstract An efficient and highly stereoselective synthesis of densely substituted 1,3-dienes has been achieved which entails a sequential double olefination of 2-(arylmethylidene)-2-phosphonoacetonitriles by a one-pot domino process involving Michael addition of dimsyllithium to 2-(arylmethylidene)-2-phosphonoacetonitrile, Horner,Wadsworth,Emmons reaction of the resulting phosphonate ylide with the added aldehyde followed by base induced methylsulfenoxy elimination. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source] Highly Stereoselective Halocyclopropanation of ,,,-Unsaturated AmidesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 13 2009Abstract A convenient highly stereoselective synthesis of chloro- and bromocyclopropanamides from di- tri- or tetrasubstituted (E)- or (Z)-,,, - unsaturated amides with total or high stereoselectivity promoted by chromium dichloride or dibromide is described. The transformation of chlorocyclopropanamides into the corresponding ketones or amines is also reported. A mechanism to explain these transformations is proposed. [source] Highly Efficient and Stereoselective Julia,Kocienski Protocol for the Synthesis of ,-Fluoro-,,,-unsaturated Esters and Weinreb Amides Employing 3,5-Bis(trifluoromethyl)phenyl (BTFP) SulfonesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-12 2008Diego Abstract ,-Fluoroacetates 3 and Weinreb amide 4, bearing a ,-[3,5-bis(trifluoromethyl)phenyl]sulfonyl (BTFP-sulfonyl) group at the ,-position, are employed in the highly stereoselective synthesis of ,-fluoro-,,,-unsaturated alkenoates and Weinreb amides, respectively. Aromatic and aliphatic aldehydes are condensed under extremely mild and simple reaction conditions using potassium carbonate in dimethylformamide at room temperature under solid-liquid phase-transfer catalysis conditions in good yields and high Z -diastereoselectivities, specially in the case of the fluorinated Weinreb amides. A detailed computational mechanistic study suggests a final non-concerted elimination of sulfur dioxide and 3,5-bis(trifluoromethyl)phenoxide and explains the observed high stereoselectivities for the reaction on the basis of thermodynamic and kinetic considerations. [source] | ||||||||||||||||||||||