نتایج جستجو برای: 13 dipolar cycloaddition

تعداد نتایج: 343672  

Journal: :Organic & biomolecular chemistry 2006
Guan-Wu Wang Jia-Xing Li

The novel multicomponent reaction of [60]fullerene with dimethyl acetylenedicarboxylate and isoquinoline, quinoline or substituted quinolines was investigated. This type of reaction presents the first example of a 1,4-dipolar cycloaddition reaction in fullerene chemistry.

Journal: :Organic & biomolecular chemistry 2010
Nan Li Jin Song Xi-Feng Tu Bin Liu Xiao-Hua Chen Liu-Zhu Gong

A chiral phosphoric acid-catalyzed intramolecular 1,3-dipolar cycloaddition of 4-(2-formylphenoxy)butenoates with amino esters provides hexahydromeno[4,3-b]pyrrolidine derivatives in high enantioselectivity (up to 94% ee).

Journal: :Chemical communications 2007
Tzofit Kehat Moshe Portnoy

The yield and enantioselectivity of an asymmetric aldol reaction, catalyzed by a proline derivative immobilized on polystyrene via dipolar cycloaddition, are remarkably improved by the dendronization of the support.

Journal: :Chemical communications 2011
Christine Wiebe Claudine Schlemmer Stefan Weck Till Opatz

Mono- and diglycosylated aromatics and heteroaromatics may serve as building blocks for the construction of metabolically stable mimetics of oligosaccharides. Methods for their preparation from monosaccharidic precursors by direct C-glycosylation, dipolar cycloaddition or Larock cyclization are described.

Journal: :Chemical communications 2011
Tang-Lin Liu Zhao-Lin He Hai-Yan Tao Yue-Peng Cai Chun-Jiang Wang

A direct and facile synthesis of highly functional 5-aza-spiro[2,4]heptanes, a valuable structural motif for drug discovery, is developed via catalytic asymmetric 1,3-dipolar cycloaddition of cyclopropylidene acetate and azomethine ylides for the first time.

Journal: :Chemistry & biodiversity 2012
Melinda Nonn Loránd Kiss Mikko M Hänninen Reijo Sillanpää Ferenc Fülöp

Fluorinated highly functionalized cispentacin derivatives were synthetised starting from an unsaturated bicyclic β-lactam through C=C bond functionalization via the dipolar cycloaddition of a nitrile oxide, isoxazoline opening, and fluorination by OH/F exchange.

Journal: :Chemical communications 2008
Julien Iehl Rossimiriam Pereira de Freitas Béatrice Delavaux-Nicot Jean-François Nierengarten

A Th-symmetrical C60 hexakis-adduct bearing 12 peripheral azide groups has been prepared and used to produce functionalized derivatives by the copper mediated Huisgen 1,3-dipolar cycloaddition of azides and alkynes.

Journal: :Dalton transactions 2015
Rebecca L Melen Douglas W Stephan

The 1,3-dipolar cycloaddition reactions of the electron deficient boron azide, (C6F5)2BN3 (1) with the electron-poor acetylenes RO2CC≡CCO2R (R = Me, Et) afforded the new mono- and bis-1,2,3-triazole derivatives and .

Journal: :Chemical communications 2010
Yi Jiang Jia-Bin Guo Chuan-Feng Chen

A novel bifunctionalized [3]rotaxane based on a triptycene-derived macrotricyclic host was conveniently synthesized. On the basis of the [3]rotaxane, a linear main-chain poly[3]rotaxane was further obtained by the highly efficient Huisgen 1,3-dipolar cycloaddition.

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