Results 311 to 320 of about 2,937,461 (378)

anti-Diradical Formation in 1,3-Dipolar Cycloadditions of Nitrile Oxides to Acetylenes.

Journal of Organic Chemistry, 2015
By means of high level quantum chemical calculations (B2PLYPD and CCSD(T)), the mechanisms of the reaction of nitrile oxides with alkenes and alkynes were investigated.
Gebhard Haberhauer, R. Gleiter, Sascha Woitschetzki   +2 more
semanticscholar   +1 more source

Fluorescent Probes from Stable Aromatic Nitrile Oxides

, 2016
Stable aromatic nitrile oxides underwent a 1,3-dipolar cycloaddition reaction with 1-iodo-4-(prop-2-yn-1-yloxy)benzene to afford the expected isoxazoles in very good yields as single regioisomers.
Luigi Ferdinando Minuti, M. Memeo, Stefano Crespi, P. Quadrelli   +3 more
semanticscholar   +1 more source

Asymmetric synthesis of spiro[isoxazolin-3,3'-oxindoles] via the catalytic 1,3-dipolar cycloaddition reaction of nitrile oxides.

Journal of Organic Chemistry, 2014
A highly enantioselective 1,3-dipolar cycloaddition of nitrile oxides with 3-arylidene-oxindoles was realized by a chiral N,N'-dioxide-nickel(II) complex catalyst under mild reaction conditions.
Xiangjin Lian, S. Guo, Gang‐Wei Wang, Lili Lin, Xiaohua Liu, Xiaoming Feng   +5 more
semanticscholar   +1 more source

Fragmentation of nitrile oxides with triethylamine

Tetrahedron Letters, 1983
Abstract The formation of 1,2,4-oxadiazoles is frequently observed as a side reaction in cycl o additions with nitrile oxides generated in situ and follows from a fragmentation induced by Et3N. This latter is oxidized to N,N-diethylvinylamine, which is trapped as a cycloadduct.
A. Compagnini, F.Marinone Albini, P. Caramella, Antonino Corsaro   +3 more
openaire   +2 more sources

PhIO promoted synthesis of nitrile imines and nitrile oxides within a micellar core in aqueous media: a regiocontrolled approach to synthesizing densely functionalized pyrazole and isoxazoline derivatives

, 2014
A highly efficient and general protocol has been developed for the facile synthesis of highly diversified 1,3,5-trisubstituted pyrazoles and 3,5-disubstituted 2-isoxazolines through one-pot tandem intermolecular, as well as intramolecular, dipolar [3 + 2]
G. Pal, S. Paul, P. Ghosh, Asish R. Das
semanticscholar   +1 more source

Hypervalent iodine catalyzed generation of nitrile oxides from oximes and their cycloaddition with alkenes or alkynes.

Organic Letters, 2013
Hypervalent iodine catalyzed oxidation of aldoximes using oxone as a terminal oxidant generates nitrile oxides, which react with alkenes and alkynes to give the corresponding isoxazolines and isoxazoles in moderate to good yields.
A. Yoshimura, K. Middleton, Anthony D. Todora, Brent J. Kastern, S. Koski, Andrey V. Maskaev, V. Zhdankin   +6 more
semanticscholar   +1 more source

The addition of nitrile oxides to C60

Tetrahedron, 1996
Abstract The 1,3-dipolar cycloaddition of nitrile oxides to C60 is described. These reactions result in the formation of fullerene-fused isoxazoline heterocycles bearing a series of different substituents in 3-position. The preparation and spectroscopic characterization of these compounds are reported, as well as some investigations of the reactivity
Mark S. Meier, Magdalena Poplawska
openaire   +2 more sources

New synthetic route to OH-functionalized nitrile N-oxide and polyfunctional nitrile N-oxides for click crosslinking and decrosslinking of natural rubber

, 2018
A new synthetic route for obtaining polyfunctional nitrile N-oxides from OH-tethering nitrile N-oxide is reported. OH-Tethering nitrile N-oxide is synthesized using the proposed route by using an intermediary nitroalkane and derived to polyfunctional ...
H. Sogawa, Syunsuke Monjiyama, Chen‐Gang Wang, Toyokazu Tsutsuba, T. Takata   +4 more
semanticscholar   +1 more source

A short and flexible route to tetrahydropyran-4-ones via conjugated nitrile oxides cycloaddition and oxa-Michael cyclization: a concise diastereoselective total synthesis of (±)-diospongin A.

Chemical Communications, 2013
A short and flexible [3+2+1] synthetic strategy was developed for the synthesis of substituted tetrahydropyran-4-ones, featuring [3+2]-cycloaddition of α,β-unsaturated nitrile oxides and alkenes and oxa-Michael cyclization in a 6-endo-trig fashion.
Hongliang Yao, Jingyun Ren, Rongbiao Tong   +2 more
semanticscholar   +1 more source

Nitrile Oxide Cycloadditions to Olefinated Sugars.

ChemInform, 2003
AbstractFor Abstract see ChemInform Abstract in Full Text.
Pedro A. Colinas, Albrecht Lieberknecht, Albrecht Lieberknecht, Rodolfo D. Bravo, Volker Jäger   +4 more
openaire   +3 more sources