نتایج جستجو برای: 3 dipolar cycloaddition

تعداد نتایج: 1820449  

Journal: :Organic & biomolecular chemistry 2010
Xiong Huang Ping Li Xin-Sheng Li Dong-Cheng Xu Jian-Wu Xie

The diversely functionalized tricyclic tetrazoles were synthesised from readily available substrates via intramolecular 1,3-dipolar cycloaddition as the key step in good yields (53-78% yield for two steps) with high enantioselectivities (81-99% ee).

Journal: :Chemical communications 2013
Martin Mattarella Johannes M Haberl Janne Ruokolainen Ehud M Landau Raffaele Mezzenga Jay S Siegel

Five-fold symmetric substituted corannulene derivatives that display liquid-crystalline behavior and organogelation properties were prepared by coupling of N-azidoethyl long-chain fatty acid amides to sym-pentabutynyl corannulenes via dipolar cycloaddition chemistry.

Journal: :Organic & biomolecular chemistry 2010
Adam J M Burrell Luke Watson Nathaniel G Martin Niall Oram Iain Coldham

Condensation of an aldehyde with an α-amino-ester, followed by a tandem process involving cyclization to a seven-membered ring, deprotonation to an intermediate azomethine ylide and intramolecular dipolar cycloaddition gave tricyclic products related to stenine and neostenine.

Journal: :Organic letters 2005
Wenzhong Gao Xumu Zhang Malati Raghunath

[reaction: see text] A novel Cu(I)-catalyzed asymmetric 1,3-dipolar cycloaddition of azomethine ylides with acrylates has been developed. Up to 98/2 exo/endo selectivity and up to 98% enantiomeric excess have been achieved.

Journal: :Chemical communications 2009
Gábor London Gregory T Carroll Tatiana Fernández Landaluce Michael M Pollard Petra Rudolf Ben L Feringa

A Cu(I)-catalyzed 1,3-dipolar cycloaddition was used to construct a monolayer of an altitudinal molecular motor on quartz and silicon substrates, which represents the fastest light-driven molecular motor, to date, grafted to a solid surface.

2018
Alejandra Riesco-Domínguez Jeroen van de Wiel Trevor A Hamlin Bas van Beek Stephen D Lindell Daniel Blanco-Ania F Matthias Bickelhaupt Floris P J T Rutjes

Trifluoromethyl vinyl sulfide, a potential building block for pharmaceutically and agrochemically relevant products, is prepared and used for the first time in high-pressure-mediated 1,3-dipolar cycloaddition reactions with nitrones to synthesize (trifluoromethyl)sulfanyl isoxazolidines.

Journal: :Chemical communications 2005
Joost A Opsteen Jan C M van Hest

Polymeric building blocks containing terminal azide and alkyne functionalities are prepared via atom transfer radical polymerization (ATRP) and used to modularly synthesize block copolymers via 1,3-dipolar cycloaddition reactions, which are quantitative according to SEC measurements.

Journal: :Bioorganic & medicinal chemistry letters 2007
Martijn Verdoes Ulrik Hillaert Bogdan I Florea Myra Sae-Heng Martijn D P Risseeuw Dmitri V Filippov Gijsbert A van der Marel Herman S Overkleeft

The synthesis of three acetylene functionalized BODIPY dyes is described. These dyes are used to fluorescently modify an azido functionalized epoxomicin analogue employing the Huisgen 1,3-dipolar cycloaddition, resulting in a panel of fluorescent epoxomicin derived proteasome probes.

Journal: :Organic & biomolecular chemistry 2012
Nagatoshi Nishiwaki Kazuya Kobiro Shotaro Hirao Jun Sawayama Kazuhiko Saigo Yumiko Ise Maho Nishizawa Masahiro Ariga

A new protocol for synthesizing different functionalized isoxazoles is provided. Carbamoylnitrile oxide generated from nitroisoxazolone underwent inverse electron-demand 1,3-dipolar cycloaddition with 1,3-dicarbonyl compounds in the presence of magnesium acetate that formed magnesium enolate in situ. Although electron-deficient trifluoroacetoacetate did not undergo this cycloaddition under the ...

Journal: :Molecules 2017
Alexander Anis'kov Irina Klochkova Roman Tumskiy Alevtina Yegorova

For the first time, arylmethylidene cyclohexanones that are non-symmetrical due to the presence of peripheral substituents were studied in 1,3-dipolar cycloaddition reactions. It is shown that the interaction with the azomethine ylide generated from sarcosine proceeds regio- and diastereoselectively, with the participation of two non-equivalent parts of the dipolarophile. Also for the first tim...

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