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Stille Coupling (stille + coupling)
Terms modified by Stille Coupling Selected AbstractsChemInform Abstract: A Novel Stereoselective Synthesis of (Z)-,-Arylsulfanyl-,,,-unsaturated Ketones via Stille Coupling of (E)-,-Arylsulfanylvinylstannanes with Acyl Halides.CHEMINFORM, Issue 44 2009Fang Yao 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] A Straightforward Approach Towards Piperidines via Stille Coupling and Subsequent 1,4-Addition of Amines.CHEMINFORM, Issue 28 2006Sandra Doerrenbaecher 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] Rapid Methylation of Terminal Acetylenes by the Stille Coupling of Methyl Iodide with Alkynyltributylstannanes: A General Protocol Potentially Useful for the Synthesis of Short-Lived 11CH3 -Labeled PET Tracers with a 1-Propynyl Group.CHEMINFORM, Issue 20 2004Takamitsu Hosoya Abstract For Abstract see ChemInform Abstract in Full Text. [source] Improved Yields with Added Copper(I) Salts in Carbonylative Stille Coupling of Sterically Hindered Vinylstannanes.CHEMINFORM, Issue 19 2004R. D. Jr. Mazzola Abstract For Abstract see ChemInform Abstract in Full Text. [source] A New Series of Quadrupolar Type Two-Photon Absorption Chromophores Bearing 11, 12-Dibutoxydibenzo[a,c]-phenazine Bridged Amines; Their Applications in Two-Photon Fluorescence Imaging and Two-Photon Photodynamic TherapyADVANCED FUNCTIONAL MATERIALS, Issue 15 2009Marappan Velusamy Abstract A new series of quadrupolar type two-photon absorption (2PA) chromophores 3,9 bearing a core arylamine-[a,c]phenazine-arylamine motif are synthesized in high yields. Palladium-catalyzed Stille coupling and CN coupling reactions are utilized to prepare target chromophores. Detailed characterization and systematic studies of these molecules, including absorption and fluorescence emission, are conducted. These compounds are found to exhibit very large 2PA cross section values, for example, ,7000 GM at 800,nm for 8 in toluene. Two-photon-induced fluorescence imaging is successfully demonstrated in vitro using compound- 8 -encapsulated silica nanoparticles with excellent bio-compatibility. In combination with the capability of both one- and two-photon singlet-oxygen sensitizations, this nanocomposite demonstrates its promising potential in dual functionality toward two-photon fluorescence imaging and two-photon photodynamic therapy. [source] V-Shaped Thiophene-Based Oligomers with Improved Electroluminescence Properties,ADVANCED FUNCTIONAL MATERIALS, Issue 4 2005G. Barbarella Abstract The synthesis via the Stille coupling of a new family of oligomers derived from benzo[b]thiophene is reported. Owing to their branched molecular structure lacking any symmetry element, these compounds display a low tendency to crystallization and better film-forming properties than their linear counterparts. Spin-coated films show photoluminescence efficiencies up to 50,%. Light-emitting diodes with spin-coated films as the active layers display markedly improved performance with respect to similar devices based on linear oligothiophenes, with luminance values up to more than 10,000,cd,m,2. Semiempirical PM3 and ZINDO/S calculations provide insight into the molecular geometries and electron distribution of the frontier orbitals of the new compounds. Cyclic voltammetry data indicates that the transformation of the thienyl sulfur of benzo[b]thiophene to the corresponding thienyl- S,S -dioxide leads an increase in electron affinity by 0.5,0.7,V, analogous to that of the corresponding linear oligomers. [source] Imine Additions of Internal Alkynes for the Synthesis of Trisubstituted (E)-Alkene and Cyclopropane Peptide IsosteresADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 11-13 2005Peter Wipf Abstract Divergent multi-component reactions (DMCR) involving CC bond formations can provide large increases in structural diversity and allow the rapid assembly of complex products from readily available starting materials. Cascade hydrozirconation-Zr/Zn transmetalation-imine addition of alkynes represents a versatile methodology for the synthesis of (E)-alkene and cyclopropane dipeptide isosteres. Appropriate substitutions at the sp2 -carbon of (E)-alkene peptide isosteres allow a range of Pd-catalyzed cross-coupling reactions, which can be used for the fine-tuning of the conformational and electronic properties of the parent peptide bond mimic. CC bond formation by microwave-accelerated Stille coupling of stannylalkenes represents a fast, convergent synthetic approach toward trisubstituted (E)-alkene dipeptide isosteres. [source] Bichalcophenes: A concise synthesis of formyl ester- and cyano ester-substituted bithiophenes, bifurans, and furanothiophenesJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 1 2010Abdelbasset A. Farahat Syntheses of new formyl ester- and cyano ester-substituted bithiophenes, bifurans, and furanothiophenes in good yield are described. The key synthetic step uses Stille coupling of appropriately substituted bromo 5-ring heterocycles with stannyl-substituted 5-ring heterocycles. J. Heterocyclic Chem., (2010). [source] Chemoenzymatic Total Synthesis of the Antiproliferative Polyketide (+)-(R)-AureothinCHEMBIOCHEM, Issue 13 2008Martina Werneburg Enzymaticaurification: The first asymmetric synthesis of the antiproliferative and antifungal pyrone metabolite (+)-(R)-aureothin (1) from Streptomyces thioluteus was completed by taking advantage of synergy of synthetic and enzymatic transformations. Synthetic vinyl iodide 14 was regioselectively methylated by AurI prior to asymmetric heterocyclization catalyzed by the bifunctional monooxygenase AurH and Stille coupling. [source] Synthetic analogs of dioncophylline and michellamines by stille couplingJOURNAL OF HETEROCYCLIC CHEMISTRY, Issue 5 2006Abdel-Sattar S. Hamad Elgazwy Dioncophielline and Michellamine Analogs S-5, R-5, S-7, R-7, S,S-8, R,R-8 and R,S-8 were synthesized by using Stille coupling condition (Pd°-mediated cross coupling) proceeds in low yield when using stannanes 1 or 2 with tetrahydroisoquinolinyl bromide 3. The addition of tetrahydroisoquinolinyl iodide 4 instead of 3 significantly improves the efficiency of the coupling and providing a variety of Dioncophielline and Michellamine analogs in moderate yields. [source] | ||||||||||