Results 11 to 20 of about 3,577 (190)
, 2016 Intramolecular cycloadditions with high regio- and stereocontrol are important methods for the efficient assembly of complex molecular structures. Efficient routes to the synthesis of norbornadiene-tethered nitrile oxides have been developed, and their ...
Robert Jordan (346146) +3 more
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Molecules, 2014 The coupling of proline- and azetidinone-substituted alkenes to 2-azidobenzoic and 2-azidobenzenesulfonic acid gives precursors that undergo intramolecular azide to alkene 1,3-dipolar cycloadditions to give imine-, triazoline- or aziridine-containing ...
Karl Hemming +3 more
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Intermolecular 1,3-dipolar cycloadditions of azomethine imines [PDF]
ARKIVOC, 2006 Dipolar cycloadditions of azomethine imines, formed in situ from aldehydes and N1-alkyl-N2-acylhydrazines, with electron-deficient dipolarophiles produce pyrazolidines: mono-substituted dipolarophiles afford principally 4-substituted ...
Raymond C. F. Jones +2 more
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Sydnone-Based Approach to Heterohelicenes through 1,3-Dipolar-Cycloadditions. [PDF]
J Am Chem Soc, 2019 International audienceThe first approach to pyrazole containing helicenes via sydnone-aryne [3+2]-cycloaddition is described. An unprecedented regioselectivity in the cycloaddition step towards the more sterically constrained product was observed in ...
Yen-Pon E +10 more
europepmc +2 more sources
Studies on the [2+3] cycloaddition reaction of nitrile oxides to abietic acid esters [PDF]
Journal of the Serbian Chemical Society, 2019 [2+3] Dipolar cycloadditions of aromatic nitrile oxides to abietic acid esters were investigated. The reactions showed complete site selectivity and regioselectivity, while the stereoselectivity depended on the structures of the dipolarophiles.
Gucma Mirosław +3 more
doaj +1 more source
The Azide-Allene Dipolar Cycloaddition: Is DFT Able to Predict Site- and Regio-Selectivity?
Molecules, 2021 The site- and regio-selectivity of thermal, uncatalysed 1,3-dipolar cycloadditions between arylazides and mono- or tetra-substituted allenes with different electronic features have been investigated by both conceptual (reactivity indices) and ...
Giorgio Molteni, Alessandro Ponti
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1,3-Dipolar Cycloadditions of Diazo Compounds in the Presence of Azides. [PDF]
Org Lett, 2016 The diazo group has untapped utility in chemical biology. The tolerance of stabilized diazo groups to cellular metabolism is comparable to that of azido groups. However, chemoselectivity has been elusive, as both groups undergo 1,3-dipolar cycloadditions
Aronoff MR, Gold B, Raines RT.
europepmc +2 more sources
Kinetic solvent effects on 1,3-dipolar cycloadditions of benzonitrile oxide [PDF]
, 2005 The kinetics of 1,3-dipolar cycloadditions of benzonitrile oxide with a series of N-substituted maleimides and with cyclopentene are reported for water, a wide range of organic solvents and binary solvent mixtures.
Jan B. F. N. Engberts +5 more
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Cycloadditions with 2-Chloro-1-Nitroethylene
CHIMIA, 1975 2-chloronitroethylene replaces successfully the still elusive unsubstituted nitroacetylene in both the 1,3-dipolar and Diels-Alder cycloadditions. These reactions generally afford interesting nitrated cyclic and heterocyclic compounds.
R. Verbruggen, H.G. Viehe
doaj +1 more source
Molecules, 2001 The ZnBr2 complex of the title compound has been studied by both structural and theoretical methods. Similar reactivities have been observed for the nitrone alone and the complex in 1,3-dipolar cycloadditions and nucleophilic additions.
Tomas Tejero +5 more
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