Results 191 to 200 of about 27,886 (261)
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Chemical Communications, 2016
A catalytic asymmetric chemoselective 1,3-dipolar cycloaddition (1,3-DC) of an azomethine ylide with imines has been established via a three-component reaction of isatin-derived imines, aldehydes and an amino-ester in the presence of chiral phosphoric ...
Yue-Ming Wang +4 more
semanticscholar +1 more source
A catalytic asymmetric chemoselective 1,3-dipolar cycloaddition (1,3-DC) of an azomethine ylide with imines has been established via a three-component reaction of isatin-derived imines, aldehydes and an amino-ester in the presence of chiral phosphoric ...
Yue-Ming Wang +4 more
semanticscholar +1 more source
Kinetics and Mechanism of 1,3‐Dipolar Cycloadditions
, 1963Criteria for the mechanism of 1,3-dipolar cycloadditions which lead to 5-membered rings are provided by the stereoselectivity observed with cis-trans isomeric dipolarophiles, by the effect of solvent and substituents on the rate constants, by the ...
R. Huisgen
semanticscholar +1 more source
, 2014
1,3-Dipolar cycloaddition reactions can be considered a powerful synthetic tool in the building of heterocyclic rings, with applications in different fields.
A. Lauria +6 more
semanticscholar +1 more source
1,3-Dipolar cycloaddition reactions can be considered a powerful synthetic tool in the building of heterocyclic rings, with applications in different fields.
A. Lauria +6 more
semanticscholar +1 more source
Journal of Organic Chemistry, 2015
The first catalytic enantioselective construction of a 3,3'-pyrrolidinyldispirooxindole scaffold has been established via organocatalytic asymmetric 1,3-dipolar cycloadditions of isatin-derived azomethine ylides with methyleneindolinones, which afforded ...
W. Dai +4 more
semanticscholar +1 more source
The first catalytic enantioselective construction of a 3,3'-pyrrolidinyldispirooxindole scaffold has been established via organocatalytic asymmetric 1,3-dipolar cycloadditions of isatin-derived azomethine ylides with methyleneindolinones, which afforded ...
W. Dai +4 more
semanticscholar +1 more source
Asymmetric 1,3-Dipolar Cycloaddition Reactions
Chemical Reviews, 1998AbstractChemInform 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.
Kurt V. Gothelf, Karl Anker Jørgensen
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ChemInform Abstract: 1,3‐Dipolar Cycloadditions to Allenes
ChemInform, 1996AbstractChemInform 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.
BROGGINI, GIANLUIGI +1 more
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, 2017
A polystyrene–poly(ethylene glycol) (PS–PEG) resin-supported triazine-based polyethyleneamine dendrimer copper catalyst (PS–PEG-TD2–CuSO4) was prepared and characterized by means of CP-MAS NMR, UV–vis/NIR, FTIR, SEM-EDX, XPS, and ICP-AES analyses. PS–PEG-
S. Pan, Shuo Yan, T. Osako, Y. Uozumi
semanticscholar +1 more source
A polystyrene–poly(ethylene glycol) (PS–PEG) resin-supported triazine-based polyethyleneamine dendrimer copper catalyst (PS–PEG-TD2–CuSO4) was prepared and characterized by means of CP-MAS NMR, UV–vis/NIR, FTIR, SEM-EDX, XPS, and ICP-AES analyses. PS–PEG-
S. Pan, Shuo Yan, T. Osako, Y. Uozumi
semanticscholar +1 more source
1994
Von Huisgen 1,2) wurde 1963 die 1,3-dipolare Cycloaddition 3–5) als Reaktionsprinzip zum Aufbau von Heterocyclen systematisiert. Man versteht darunter die Addition eines 1,3-Dipols 1, der aus den verschiedenen Kombinationen von Kohlenstoff-, Stickstoff- und Sauerstoffatomen bestehen kann und vier nicht dienische π-Elektronen umfast, an eine ...
Thomas Laue, Andreas Plagens
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Von Huisgen 1,2) wurde 1963 die 1,3-dipolare Cycloaddition 3–5) als Reaktionsprinzip zum Aufbau von Heterocyclen systematisiert. Man versteht darunter die Addition eines 1,3-Dipols 1, der aus den verschiedenen Kombinationen von Kohlenstoff-, Stickstoff- und Sauerstoffatomen bestehen kann und vier nicht dienische π-Elektronen umfast, an eine ...
Thomas Laue, Andreas Plagens
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ChemInform Abstract: 1,3‐Dipolar Cycloadditions to Oxidopyraziniums.
ChemInform, 1987Abstract 1,5-Dimethyl-3-oxidopyrazinium (6) undergoes cycloadditions with methyl acrylate, acrylonitrile, diethyl maleate, maleimide, methyl propiolate and diethyl acetylenedicarboxylate.
Miklos Kiss +2 more
openaire +3 more sources
Journal of Organic Chemistry, 2015
The first catalytic asymmetric 1,3-dipolar cycloadditions (1,3-DCs) of isatin-derived azomethine ylide with allenes have been established, which efficiently assembly isatins, amino-esters and 2,3-allenoate into enantioenriched spiro[indoline-3,2'-pyrrole]
Cong‐Shuai Wang +4 more
semanticscholar +1 more source
The first catalytic asymmetric 1,3-dipolar cycloadditions (1,3-DCs) of isatin-derived azomethine ylide with allenes have been established, which efficiently assembly isatins, amino-esters and 2,3-allenoate into enantioenriched spiro[indoline-3,2'-pyrrole]
Cong‐Shuai Wang +4 more
semanticscholar +1 more source