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Reaction Catalyzed (reaction + catalyze)
Kinds of Reaction Catalyzed Selected AbstractsVery Fast Suzuki,Miyaura Reaction Catalyzed by Pd(OAc)2 under Aerobic Conditions at Room Temperature in EGME/H2OEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 1 2009Alessandro Del Zotto Abstract The results of a ligand-free Pd(OAc)2 -catalyzed Suzuki,Miyaura C,C coupling performed at room temperature under aerobic conditions are presented. It was found that the use of an ethylene glycol monomethyl ether/H2O mixture as the solvent resulted in very rapid reactions of aryl bromides with arylboronic acids. As a matter of fact, under optimized conditions, some substrates were converted quantitatively in less than 1 min with exceptionally high TOF values. For example, the reaction between 4-methoxyphenylboronic acid and bromobenzene afforded 4-methoxybiphenyl in 30 s with TOF = 180000 h,1. Furthermore, the reaction tolerates a wide range of functional groups and can be successfully applied to heteroaryl bromides such as 2-bromopyridine and 5-bromopyrimidine. Interestingly, also an activated aryl chloride such as 1-chloro-4-nitrobenzene reacted quantitatively with phenylboronic acid at 373 K. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source] Acrolein Diethyl Acetal: A Three-Carbon Homologating Reagent for the Synthesis of ,-Arylpropanoates and Cinnamaldehydes by Heck Reaction Catalyzed by a Kaiser Oxime Resin Derived PalladacycleEUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 18 2008Emilio Alacid Abstract A polymer palladacycle derived from Kaiser oxime resin was used as a source of palladium(0) in the chemoselective Heck reaction of acrolein diethyl acetal with aryl halides under ligand-free conditions. The use of typical Heck conditions afforded 3-arylpropionic esters, and the process can be directed to the synthesis of cinnamaldehydes under Cacchi conditions. These processes take place with rather low loading of the catalyst, which can be recovered by simple filtration and reused for at least five runs without competitive dehalogenation. This is the first time that a supported palladium complex has been reused under Cacchi conditions. ICP-OES analyses of the Pd content of the crude products in both transformations indicated lower leaching for the esters than for the aldehydes in the range up to 0.08 ppm for the esters and 0.8 ppm for the aldehydes.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source] An Efficient Domino Synthesis of Quinoxalin-2(1H)-ones via an SNAr/Coupling/Demesylation Reaction Catalyzed by Copper(I) as Key StepADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 6 2010Dingben Chen Abstract An efficient copper-catalyzed method for the synthesis of quinoxalin-2(1,H)-ones derivatives via domino SNAr/coupling/demesylation reaction of N -(2-halophenyl)methylsulfonamides with 2-halo amides has been developed. Various quinoxalinones with diversity at three positions on their scaffold have been obained, and the method is valuable for the construction of this kind of molecules with biological and pharmaceutical activities. [source] Highly Efficient Asymmetric Three-Component Vinylogous Mannich Reaction Catalyzed by a Chiral Scandium(III)- N,N,-Dioxide ComplexADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 6 2010Qi Zhang Abstract The asymmetric three-component vinylogous Mannich reaction of an acyclic silyl dienol ester, an aldehyde and 2-aminophenol was accomplished using a chiral N,N,-dioxide-scandium(III) complex as the catalyst. A variety of aldehydes were found to be suitable substrates for the reaction and the desired ,-amino-,,,-unsaturated esters were obtained in 90,99% yields with good to excellent enantioselectivities (up to >99% ee) and complete regioselectivities. Moreover, the simple experimental procedures were air-tolerant and convenient. The present catalytic process provides the potential for large-scale syntheses of the chiral ,-amino-,,,-unsaturated esters. [source] Enantioselective Mannich-Type Reaction Catalyzed by a Chiral Brønsted Acid Derived from TADDOLADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-13 2005Takahiko Akiyama Abstract A novel cyclic dialkyl phosphate was synthesized starting from (+)-diethyl tartrate. Its catalytic activity as a chiral Brønsted acid has been examined in the Mannich-type reaction of a ketene silyl acetal with aldimines as a model reaction. The corresponding ,-amino acid esters were obtained with high enantioselectivity. [source] Aqueous Asymmetric Mukaiyama Aldol Reaction Catalyzed by Chiral Gallium Lewis Acid with Trost-Type Semi-Crown LigandsADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 9 2005Hui-Jing Li Abstract The combination of Ga(OTf)3 with chiral semi-crown ligands (1a,e) generates highly effective chiral gallium Lewis acid catalysts for aqueous asymmetric aldol reactions of aromatic silyl enol ethers with aldehydes. A ligand-acceleration effect was observed. Water is essential for obtaining high diastereoselectivity and enantioselectivity. The p -phenyl substituent in aromatic silyl enol ether (2,h) plays an important role and increases the enantioselectivity up to 95% ee. Although aliphatic silyl enol ethers provided low enantioselectivities and silylketene acetal is easily hydrolyzed in aqueous alcohol, the aldol reactions of silylketene thioacetal (12) with aldehydes in the presence of gallium-Lewis acid catalysts give the ,-hydroxy thioester with reasonable yields and high diastereo- (up to 99,:,1) and enantioselectivities (up to 96% ee). [source] Study on an Aldol Reaction Catalyzed by Ti(IV)/Calix[n]arene ComplexesADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 6 2005Annunziata Soriente Abstract Ti(IV)/calixarene complexes, formed in situ or previously prepared with standard procedures, can be conveniently used as efficient catalysts in the aldol reaction of Chan's silyloxydiene with a range of aldehydes bearing either activating or deactivating groups, including aromatic, heteroaromatic and ,,,-unsaturated ones. The structure of both calixarene ligand and aldehyde, as well as the reaction conditions, strongly influence the efficiency of the reaction. NMR experiments in conjunction with the experimental results suggest that the structure of the catalytic species in the Ti(IV)/calixarene system prepared in situ is strongly dependent on the concentration and temperature adopted. [source] Asymmetric Nazarov Reaction Catalyzed by Chiral Tris(oxazoline)/Copper(II),ANGEWANDTE CHEMIE, Issue 26 2010Peng Cao Dr. In Gegenwart eines dreizähnigen Liganden führte die Titelreaktion hoch effizient zu chiralen O-Heterohexahydroindenonen. Die Produkte wurden mit ausgezeichneten Ausbeuten, Enantio- und Diastereoselektivitäten erhalten. HFIP=Hexafluor-2-propanol, BArF= Tetrakis[3,5-bis(trifluormethyl)phenyl]borat. [source] ChemInform Abstract: Direct Asymmetric Aldol Reaction Catalyzed by C2 -Symmetrical Chiral Primary Amine Organocatalysts.CHEMINFORM, Issue 27 2010Gong-Jian Zhu 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: Stereoselective Synthesis of Isoquinuclidinones by Direct Imino-Diels,Alder Type Reaction Catalyzed by L-Proline.CHEMINFORM, Issue 16 2010Noelia Quinones 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: Synthesis of Amides Through the Cannizzaro-Type Reaction Catalyzed by Lanthanide Chlorides.CHEMINFORM, Issue 10 2010Lijun Zhang 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: Strecker-Type Reaction Catalyzed by Carboxylic Acids in Aqueous Media.CHEMINFORM, Issue 43 2009Zhengfeng Xie 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] ChemInform Abstract: Highly Efficient One-Pot, Three-Component Mannich Reaction Catalyzed by Boric Acid and Glycerol in Water with Major "syn" Diastereoselectivity.CHEMINFORM, Issue 43 2009Chhanda Mukhopadhyay 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] ChemInform Abstract: Heck Reaction Catalyzed by Mesoporous SBA-15-Supported Ionic Liquid,Pd(OAc)2.CHEMINFORM, Issue 20 2009Ji-Young Jung 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] ChemInform Abstract: Mannich-Type Reaction Catalyzed by Silica-Supported Fluoroboric Acid under Solvent-Free Conditions.CHEMINFORM, Issue 32 2008WeiYi 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 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: An Enantioselective Biginelli Reaction Catalyzed by a Simple Chiral Secondary Amine and Achiral Broensted Acid by a Dual-Activation Route.CHEMINFORM, Issue 32 2008Junguo Xin 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] ChemInform Abstract: Recyclable Copper Catalysts in the Enantioselective Glyoxylate-Ene Reaction Catalyzed by Chiral Fluorous-Tagged Bis(oxazolines).CHEMINFORM, Issue 17 2008Robert Kolodziuk 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] ChemInform Abstract: Copper-Free Sonogashira Cross-Coupling Reaction Catalyzed by Polymer-Supported N-Heterocyclic Carbene Palladium Complex.CHEMINFORM, Issue 2 2008Jong-Ho 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] exo-Selective Asymmetric Diels,Alder Reaction Catalyzed by Diamine Salts as Organocatalysts.CHEMINFORM, Issue 52 2007Taichi Kano 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] Enantioselective Henry Reaction Catalyzed with Copper(II),Iminopyridine Complexes.CHEMINFORM, Issue 51 2007Gonzalo Blay 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] Nitroaldol Reaction Catalyzed by Tris(2,4,6-trimethoxyphenyl)phosphine (TTMPP).CHEMINFORM, Issue 45 2007N. Hirata 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 Heck Reaction Catalyzed by Co Hollow Nanospheres in Ligand-Free Condition.CHEMINFORM, Issue 33 2007Ping Zhou 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] Allenic Pauson,Khand Reaction Catalyzed by Cobalt,Rhodium Heterobimetallic Nanoparticles.CHEMINFORM, Issue 26 2007Ji Hoon Park 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] Direct Asymmetric Aldol Reaction Catalyzed by Simple Prolinamide Phenols.CHEMINFORM, Issue 25 2007Yu-Qin Fu 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] Stereoselective Synthesis of ,-Amino Ketones via Direct Mannich-Type Reaction Catalyzed with Silica Sulfuric Acid.CHEMINFORM, Issue 23 2007Hui Wu 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] Chiral Diols: A New Class of Additives for Direct Aldol Reaction Catalyzed by L-Proline.CHEMINFORM, Issue 16 2007Yan Zhou 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] Asymmetric Morita,Baylis,Hillman Reaction Catalyzed by Isophoronediamine-Derived Bis(thio)urea Organocatalysts.CHEMINFORM, Issue 4 2007Albrecht Berkessel 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] Hetero-Diels,Alder Reaction Catalyzed by Self-Organized Polymeric Rare Earth Complexes under Solvent-Free Conditions.CHEMINFORM, Issue 23 2006Shuichi Ishida 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] Enantioselective Aza-Diels,Alder Reaction Catalyzed by a Chiral Broensted Acid: Effect of the Additive on the Enantioselectivity.CHEMINFORM, Issue 21 2006Takahiko Akiyama 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] Efficient and Copper-Free Sonogashira Cross-Coupling Reaction Catalyzed by Pd(OAc)2/Pyrimidines Catalytic System.CHEMINFORM, Issue 9 2006Jin-Heng Li 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] | ||||||||||||||||||||||