Results 71 to 80 of about 12,404 (251)

Trimethylsilyl chloride promoted synthesis of a-branched amines by nucleophilic addition of organozinc halides to nitrones [PDF]

, 2012
A general procedure for the nucleophilic addition of organo-zinc halides with nitrones in the presence of trimethylsilyl chloride has been developed.
Chen, Y, Fu, Y, Hu, Y, Huang, D, Hugel, H, Liu, Y, Wang, M   +6 more
core  

Skeletal Editing of Alkenes with Nitroarenes via Photoinduced Rearrangement of N─O═C Dipoles Forms Lactams and Amides

Advanced Science, Volume 13, Issue 6, 30 January 2026.
Skeletal editing of alkenes via the cascade cleavage of C(sp2)═C(sp2) and C(sp3)─C(sp3) bonds, enabling the insertion of the nitrogen atom and thereby the synthesis of lactam and amide derivatives using nitroarenes as nitrogen atom insertion reagents under light irradiation.
Hongyun Qin, Zemin Wang, Cong Shi, Jiashu Chen, Chao Liu, Xiangqian Li, Ruihua Liu, Dayong Shi   +7 more
wiley   +1 more source

Exo Selective Enantioselective Nitrone Cycloadditions [PDF]

Journal of the American Chemical Society, 2003
We have developed a novel method for accessing exo adducts with high enantioselectivity in nitrone cycloadditions to enoates. Pyrazolidinones proved to be effective achiral templates in the cycloadditions, providing exo adducts typically in >15:1 selectivity and 90-98% ee.
Mukund P, Sibi, Zhihua, Ma, Craig P, Jasperse   +2 more
openaire   +2 more sources

1,3-Dipolar cycloadditions of 2-thio-3-chloroacrylamides with nitrile oxides and nitrones [PDF]

, 2010
1,3-Dipolar cycloadditions of 2-thio-3-chloroacrylamides with nitrile oxides and nitrones is described. A series of novel isoxazolines are isolated from the nitrile oxide cycloadditions, whilst the isoxazolines generated from the nitrone cycloadditions ...
Kissane, Marie, Lawrence, Simon E., Maguire, Anita R.   +2 more
core   +1 more source

From Molecule to Meaning: Click and Bioorthogonal Chemical Reporters for Plant Systems, Biological Imaging, and Artistic Expression

ChemBioChem, Volume 27, Issue 1, January 2026.
At the intersection of chemical biology, plant imaging, and contemporary art, this review introduces the concept of chembioart. By tracing how chemical reporters illuminate plant biomolecules in vivo, their role not only in advancing scientific understanding but also in inspiring transdisciplinary collaborations and visual expression is highlighted ...
Marie Hinnebo, Clémence Simon, Adèle Tilouine, Corentin Spriet, Christophe Biot   +4 more
wiley   +1 more source

Addition of lithiated enol ethers to nitrones and subsequent Lewis acid induced cyclizations to enantiopure 3,6-dihydro-2H-pyrans – an approach to carbohydrate mimetics

Beilstein Journal of Organic Chemistry, 2010
A stereodivergent synthesis of enantiopure 3,6-dihydro-2H-pyrans is presented. The addition of lithiated enol ethers to carbohydrate-derived nitrones afforded syn- or anti-configured hydroxylamine derivatives 4a–d that were cyclized under Lewis acidic ...
Fabian Pfrengle, Hans-Ulrich Reissig
doaj   +1 more source

Bismuth Compounds React With a Nitrone: Lewis Pair Formation and Quantification of Radical Trapping

Helvetica Chimica Acta, Volume 109, Issue 1, January 2026.
The spin trap Simple Lewis adducts of the spin trap α‐phenyl‐N‐tertbutyl‐nitrone (PBN) are reported for the first time, using the dimethyl bismuth cation [BiMe2(SbF6)] as a Lewis‐acidic bonding partner. The ability of [BiMe2(SbF6)] and a range of neutral organobismuth compounds to transfer organic radicals to PBN is demonstrated qualitatively and ...
Andreas Stoy, Johannes Schwarzmann, Felix Geist, Ahmed Fetoh, Malte Jürgensen, Jordi Poater, Istemi Kuzu, Crispin Lichtenberg   +7 more
wiley   +1 more source

Synthesis of new enantiopure poly(hydroxy)aminooxepanes as building blocks for multivalent carbohydrate mimetics

Beilstein Journal of Organic Chemistry, 2014
New compounds with carbohydrate-similar structure (carbohydrate mimetics) are presented in this article. Starting from enantiopure nitrones and lithiated TMSE-allene we prepared three 1,2-oxazine derivatives which underwent a highly stereoselective Lewis
Léa Bouché, Maja Kandziora, Hans-Ulrich Reissig   +2 more
doaj   +1 more source

Cooperative Photocatalysis of 9,10‐Phenanthrenequinone and Sn(OTf)2 for Direct Mannich Reaction of Ethers via Hydrogen Atom Transfer Pathway

Advanced Synthesis &Catalysis, Volume 367, Issue 23, December 11, 2025.
A dual photocatalytic system of o‐PQ and Sn(OTf)2 enables visible light‐induced Mannich‐type addition of ethers to nitrones via Csp³–H activation. This oxidant‐free method offers broad scope and good yields. Mechanistic studies suggest that a photoexcited o‐PQ–Sn(II) complex mediates hydrogen atom transfer to form α‐oxy radicals for nitrone addition. A
Pradip Ramdas Thorve, Hun Young Kim, Kyungsoo Oh   +2 more
wiley   +1 more source

Solvent-Free 1,3-Dipolar Cycloadditions of Nitrones for a More Sustainable Synthesis of Glycomimetics

Reactions
1,3-Dipolar cycloadditions on nitrone dipoles are key reactions to access five-membered heterocycles, which are useful intermediates in the synthesis of biologically relevant glycomimetics.
Debora Pratesi, Alessio Morano, Andrea Goti, Francesca Cardona, Camilla Matassini   +4 more
doaj   +1 more source