Results 141 to 150 of about 5,904 (191)

¹⁸O Kinetic Isotope Effect Evidence for a Concerted [3+1] Cycloaddition in Phosphetane-Catalyzed Reductive <i>N</i>-Arylation of Nitroarenes. [PDF]

Tetrahedron
Kang B, Radosevich AT.
europepmc   +1 more source

Nanoparticle‐Catalysed 1,3‐Dipolar Cycloadditions [PDF]

European Journal of Organic Chemistry, 2020
The 1,3-dipolar cycloadditions of azomethine-ylides and -imines, nitrones, nitrilimines, and azides catalysed by inorganic nanoparticles are described.
Giorgio Molteni, Alessandro Ponti
exaly   +3 more sources

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Stereoselective Photoredox Catalyzed (3+3) Dipolar Cycloaddition of Nitrone with Aryl Cyclopropane

Angewandte Chemie, 2023
AbstractBy resorting to the principle of remote activation, we herein demonstrate the first photoredox catalyzed (3+3) dipolar cycloaddition of nitrones with aryl cyclopropanes. Key to the fidelity of the reaction resides in a facile manner of substrate activation by single‐electron transfer (SET) oxidation with photoredox catalysis, and the reaction ...
Yao Xu, Hai‐Xiang Gao, Chengkai Pan, Yue Shi, Chi Zhang, Genping Huang, Chao Feng   +6 more
openaire   +2 more sources

1,3-Dipolar cycloadditions of MeOPEG-bounded azides [PDF]

Tetrahedron, 2005
1,3-Dipolar cycloadditions of MeOPEG-supported azide 2 with a variety of dipolarophiles have been studied. 1-MeOPEGsupported 1,2,3-triazoles 4 and 5, 1,2,3,4-tetrazoles 12 and aziridine 14 were obtained in nearly quantitative yields. The removal of the
Giorgio Molteni, Paola Del Buttero
exaly   +2 more sources

Organocatalytic Enantioselective Dipolar [3+2] Cycloadditions of Acetylenic Aldehydes with Nitrones for the Formation of Chiral 4‐Isoxazolines [PDF]

Advanced Synthesis and Catalysis, 2012
The first organocatalytic enantioselective protocol has been developed for the dipolar [3+2]?cycloaddition between acetylenic aldehydes and nitrones through an iminium activation pathway.
, Xianrong Cai
exaly   +1 more source

New Parabanate Products by 1, 3-Dipolar Cycloaddition Reaction (‘Criss-Cross’ Cycloaddition)

High Performance Polymers, 1999
New parabanate products containing 1, 3, 5, 7-tetraazabicyclo[3, 3, 0]octane-2, 6-dione are described. The synthesis of αω-diisocyanato-telechelics starting from two diisocyanates having a preformed parabanic unit using a [3+2] dipolar cycloaddition reaction was studied.
Adrian A Caraculacu, Elena Scorţanu, Georgeta Caraculacu   +2 more
openaire   +1 more source

ChemInform Abstract: [2 + 3]Dipolar Cycloadditions of a Monomeric Thioaldehyde.

Chemischer Informationsdienst, 1986
AbstractThiopivalaldehyd (I) liefert mit den Nitronen (II) und (IV), dem Nitriloxid (VI), der Diazoverbindung (VIII) sowie dem Azomethinimin (X) die stabilen [2 + 3]‐Cycloaddukte (III), (V), (VII), (IX) und (XI).
E. VEDEJS, R. G. WILDE
openaire   +1 more source

Captodative Alkenes in Concerted 1, 3-Dipolar Cycloadditions

1986
The 1, 3-dipolar cycloaddition of an E-/Z-pair of captodative alkenes to a cyclic aldonitrone is demonstrated to occur stereospecifically. Additions of α-(tert-butylthio)acrylonitri le to a series of C, N-diphenylnitrones show a change in regioselectivity upon donor substitution in the C-phenyl-ring.
Dietrich Döpp, Jutta Walter, Sabine Holz   +2 more
openaire   +1 more source

Trimethylsilyl Triflate-promoted [2+3] Dipolar Cycloaddition of Nitrones with Allyltrimethylsilane

HETEROCYCLES, 1992
3-Alkyl-5-trimethylsilylmethylisoxazolidines are accessible in good yields and at temperatures ≤ 20°C, by the trimethylsilyl triflate-promoted reaction of allyltrimethylsilane with aliphatic nitrones.
Claudio Trombini, Dilip D. Dhavale
openaire   +1 more source