Results 191 to 200 of about 24,842 (217)

1,3‐Dipolar Cycloadditions to Strained Olefins

Helvetica Chimica Acta, 1979
AbstractThe Bredt olefins bicyclo [3.3.1]non‐1‐ene (2), bicyclo [4.2.1]non‐1 (8)‐ene (3), and bicyclo [4.2.1]non‐1 (2)‐ene (4) react rapidly with 1,3‐dipoles such as diazomethane, phenyl azide, and mesitonitrile oxide to yield mixtures of two regioisomeric cycloadducts 10, 11 and 12, respectively.
Martin K. Hohermuth, Konrad B. Becker
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ChemInform Abstract: 1,3‐Dipolar Cycloaddition Reactions of Levoglucosenone.

ChemInform, 1992
AbstractChemInform 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.
Alexander J. Blake, R. Michael Paton, Robert O. Gould, A. C. Forsyth, Tracey A. Cook   +4 more
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Directing the Activation of Donor-Acceptor Cyclopropanes Towards Stereoselective 1,3-Dipolar Cycloaddition Reactions by Brønsted Base Catalysis.

Angewandte Chemie, 2017
The first stereoselective organocatalyzed [3+2] cycloaddition reaction of donor-acceptor cyclopropanes is presented. It is demonstrated that by applying an optically active bifunctional Brønsted base catalyst, racemic di-cyano cyclopropylketones can be ...
Jakob Blom, A. Vidal-Albalat, Julie Jørgensen, C. Barløse, Kamilla S Jessen, Marc V. Iversen, K. A. Jørgensen   +6 more
semanticscholar   +1 more source

ChemInform Abstract: 1,3‐Dipolar Cycloaddition Reactions of Benzylidenecyanoamines.

Chemischer Informationsdienst, 1982
AbstractEinige inter und intramolekulare Cycloadditionsreaktionen der Benzylidencyanobenzylamine (I) werden beschrieben.
Kazunori Ueno, Otohiko Tsuge
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Controlling Asymmetric Remote and Cascade 1,3-Dipolar Cycloaddition Reactions by Organocatalysis.

Journal of the American Chemical Society, 2016
The regio- and stereoselective control of cycloaddition reactions to polyconjugated systems has been demonstrated by applying asymmetric organocatalysis.
Pernille H. Poulsen, Stefania Vergura, A. Monleón, D. K. B. Jørgensen, K. A. Jørgensen   +4 more
semanticscholar   +1 more source

1,3-Dipolar Cycloaddition of Nitrile Imine with Carbon Dioxide: Access to 1,3,4-Oxadiazole-2(3H)-ones.

Journal of Organic Chemistry, 2017
Efficient synthesis of 1,3,4-oxadiazole-2(3H)-one was achieved by CsF/18-crown-6 mediated 1,3-dipolar cycloaddition of nitrile imine and 2.0 MPa of CO2. CsF/18-crown-6 played a key role in enhancing the reactivity of CO2 as a 1,3-dipolarophile.
Chun-Xiao Guo, Wen-Zhen Zhang, Ningrong Zhang, Xiao‐Bing Lu   +3 more
semanticscholar   +1 more source

Intramolecular 1,3‐Dipolar Cycloaddition Reactions

Angewandte Chemie International Edition in English, 1976
AbstractThe intramolecular 1,3‐dipolar cycloaddition reaction of suitably functionalized 1,3‐dipoles represents a general scheme for the synthesis of novel fused ring heterocycles. Such reactions of a number of 1,3‐dipoles are summarized and the general outline and potential analogies for these reactions noted. While the immediate aim of this review is
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Synthesis of Functionalized Pyrazoles via 1,3-Dipolar Cycloaddition of α-Diazo-β-ketophosphonates, Sufones and Esters with Electron-Deficient Alkenes.

The chemical record, 2017
1,3-Dipolar cycloaddition of diazo compounds with olefinic substrates is a promising atom-economic strategy for the construction of functionalized pyrazoles.
T. Baiju, I. Namboothiri
semanticscholar   +1 more source

1,3‐Dipolar cycloadditions to alkyldicyanamides

Recueil des Travaux Chimiques des Pays-Bas, 1981
AbstractThe 1,3‐dipoles 2,4,6‐trimethylbenzonitrile oxide and benzyl azide react with alkyldicyanamides (1) to give the 3,5‐disubstituted 1,2,4‐oxadiazoles 2 and the 1,5‐disubstituted tetrazole 4, respectively, by (3 + 2)‐cycloaddition. The structure of 4 has been determined by a single crystal X‐ray analysis.
D. M. W. van den Ham, David N. Reinhoudt, P. H. Benders   +2 more
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ChemInform Abstract: 1,3‐Dipolar Cycloadditions to Nitrogen‐Substituted Allenes.

ChemInform, 1990
AbstractOn reaction with the nitrile oxide (II) the title compounds (I) (8 examples) form the monoadducts (III)‐(V) and the diadduct (VI).
BROGGINI, GIANLUIGI, Bruché L., ZECCHI, GAETANO ALDO, Pilati T.   +3 more
openaire   +4 more sources