Results 221 to 230 of about 27,886 (261)

Amine-catalyzed enantioselective 1,3-dipolar cycloadditions of aldehydes to C,N-cyclic azomethine imines.

Chemistry, 2014
Amine-catalyzed enantioselective 1,3-dipolar cycloadditions of aldehydes to C,N-cyclic azomethine imines were developed. The reactions between diversely substituted C,N-cyclic azomethine imines and aldehydes proceeded smoothly in the presence of chiral ...
Wenjun Li, Qianfa Jia, Z. Du, Kun Zhang, Jian Wang   +4 more
semanticscholar   +1 more source

A highly active catalyst for Huisgen 1,3-dipolar cycloadditions based on the tris(triazolyl)methanol-Cu(I) structure.

Organic Letters, 2009
A new tris(1-benzyl-1H-1,2,3-triazol-4-yl)methanol ligand 3 has been prepared by a triple Cu(I)-catalyzed alkyne-azide 1,3-dipolar cycloaddition (CuAAC).
Salih Ozcubukcu, Erhan Ozkal, C. Jimeno, M. A. Pericàs   +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
openaire   +3 more sources

Computational methods to calculate accurate activation and reaction energies of 1,3-dipolar cycloadditions of 24 1,3-dipoles.

Journal of Physical Chemistry A, 2011
Theoretical calculations were performed on the 1,3-dipolar cycloaddition reactions of 24 1,3-dipoles with ethylene and acetylene. The 24 1,3-dipoles are of the formula X≡Y(+)-Z(-) (where X is HC or N, Y is N, and Z is CH(2), NH, or O) or X═Y(+)-Z ...
Y. Lan, Lufeng Zou, Yang Cao, K. Houk
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
openaire   +2 more sources

Functionalization of carbon nanotubes via 1,3-dipolar cycloadditions

, 2004
The organic functionalization of carbon nanotubes has opened new avenues with opportunities to fabricate novel nanostructures by improving both their solubility and processibility.
N. Tagmatarchis, M. Prato
semanticscholar   +1 more source

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

A novel one-pot method for the preparation of pyrazoles by 1,3-dipolar cycloadditions of diazo compounds generated in situ.

Journal of Organic Chemistry, 2003
A convenient one-pot procedure for the preparation of pyrazoles by 1,3-dipolar cycloaddition of diazo compounds generated in situ has been developed. Diazo compounds derived from aldehydes were reacted with terminal alkynes to furnish regioselectively 3 ...
V. Aggarwal, J. de Vicente, R. Bonnert
semanticscholar   +1 more source

The Reactivity of Addends in the 1,3-Dipolar Cycloaddition Reaction

Russian Chemical Reviews, 1984
The influence of donor-acceptor interactions and localisation energies on the reactivity of addends in the 1,3-dipolar cycloaddition reaction is examined. It is shown that the interactions between the symmetric frontier orbitals and between the antisymmetric frontier orbitals are qualitatively different in (4π+2π)-cycloaddition reactions.
Samuilov Y., Konovalov A.
openaire   +4 more sources

Catalytic Asymmetric 1,3‐Dipolar Cycloadditions of Alkynes with Isatin‐Derived Azomethine Ylides: Enantioselective Synthesis of Spiro[indoline‐3,2′‐pyrrole] Derivatives.

, 2013
The method represents the first enantioselective construction of spiro-oxindole-based 2,5-dihydropyrrole compounds and the first enantioselective 1,3-dipolar cycloaddition of alkynes with ketone-derived azomethine ylides.
F. Shi, Ren‐Yi Zhu, Xia Liang, S. Tu
semanticscholar   +1 more source