Results 61 to 70 of about 451,004 (214)

Highly Enantioselective Catalytic 1,3-Dipolar Cycloaddition Involving 2,3-Allenoate Dipolarophiles

, 2016
A bisphosphoric acid-catalyzed 1,3-dipolar cycloaddition of buta-2,3-dienoates with azomethine ylides yields 3-methylenepyrrolidine derivatives with excellent enantioselectivity (up to 97% ee)
Long He (1696168), Xiao-Hua Chen (1336080), Jin Song (276305), Jie Yu (150626), Wei-Jie Chen (288066), Liu-Zhu Gong (1499827)   +5 more
core   +2 more sources

Novel valdecoxib derivatives by ruthenium(ii)-promoted 1,3-dipolar cycloaddition of nitrile oxides with alkynes – synthesis and COX-2 inhibition activity

, 2018
By Ru(ii)-promoted 1,3-dipolar cycloaddition of nitrile oxides with alkynes 3,4-diaryl-substituted isoxazoles are formed in one step, showing high inhibition potency for COX-2.
Roscales García, Silvia, Pietzsch, Jens, Kniess, Torsten, Holger Weiss, Daniel, Torsten Kniess, Köckerling, Martin, Martin Köckerling, Bechmann, Nicole, Daniel Holger Weiss, Nicole Bechmann, Silvia Roscales, Jens Pietzsch, Roscales, Silvia ; https://orcid.org/, Weiss, Daniel Holger, Bechmann, Nicole ; https://orcid.org/, Pietzsch, Jens ; https://orcid.org/, Köckerling, Martin ; https://orcid.org/, Kniess, Torsten ; https://orcid.org/   +17 more
core   +1 more source

A Stepwise [4 + 3] Cycloaddition Reaction of the 1,3-Diphenyl-2-azaallyl Anion [PDF]

, 1993
The 1,3-diphenyl-2-azaallyl anion (1) undergoes [3 + 2] cycloaddition reactions with the s-cis-fixed 1,3-dienes 8-11. In contrast, 1,1,2,2,3,3-hexamethyl-4,5-bis(methylene)cyclopentane (7) reacts with 1 to give the [4 + 3] cycloadduct 13 and the linear 1,
Mayr, Herbert, Heigl, Ulrich W., Baran, Janusz   +2 more
core   +1 more source

Synthesis of Spiroisoxazolines by 1,3-Dipolar Cycloaddition

Molecules, 1997
The cycloaddition of the chiral nitrile oxide 1 to 1-R-substituted 3,3-methylene-5,5-dimethyl-2-pyrrolidinones 2 (where R is H, n-butyl-, 1,1-dimethylethoxycarbonyl-, 1-methylethenyl- and acetyl-) proceeds regioselectively under the formation of ...
Peter Ertl, Vladimír Ondrus, Lubor Fisera, Peter Micuch   +3 more
doaj   +1 more source

Silicon-Tethered 1,3-Dipolar Cycloaddition of 4-Hydroxy-2-isoxazoline 2-Oxides

, 1996
Silicon-tethered 1,3-dipolar cycloaddition of 4-hydroxy-2-isoxazoline 2 ...
Landuzzi, Andrea, Righi, Paolo, Rosini, Goffredo, Marotta, Emanuela, Emanuela Marotta, Andrea Landuzzi, Paolo Righi, Goffredo Rosini   +7 more
core   +1 more source

5-Benzoyl-N,4-diphenyl-4,5-dihydro-1H-pyrazole-3-carboxamide

Acta Crystallographica Section E, 2009
The title compound, C23H19N3O2, was synthesized by the 1,3-dipolar cycloaddition reaction of N-phenyl-α-diazoacetamide and chalcone. In the molecule, the pyrazoline ring assumes an envelope conformation.
Long He
doaj   +1 more source

Síntese regiosseletiva de cristais líquidos quirais contendo o heterociclo [1,2,3]-triazol [PDF]

, 2005
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-Graduação em QuímicaO presente trabalho descreve a síntese de compostos quirais derivados do (S)-(-)-2-metil-1-butanol, contendo o ...
Conte, Gilmar
core  

Silicon-Tethered 1,3-Dipolar Cycloaddition of 4-Hydroxy-2-isoxazoline 2-Oxides

, 2016
Silicon-Tethered 1,3-Dipolar Cycloaddition of 4-Hydroxy-2-isoxazoline 2 ...
Emanuela Marotta (611756), Paolo Righi (611755), Andrea Landuzzi (2997837), Goffredo Rosini (2499802)   +3 more
core   +1 more source

Covalent Functionalization of 2D Semiconductors: A Roadmap to Advanced Electronic Devices

Advanced Functional Materials, Volume 36, Issue 87, 29 October 2026.
This Review presents recent advances in the covalent functionalization strategies for two‐dimensional semiconductors and their implementation in modern technologies. Layered materials are modified through diverse molecular chemistries (e.g., thiols, diazonium salts, alkyl halides, and electron‐deficient species) to tailor their surface properties ...
Ramiro Quirós‐Ovies, Bin Han, Paolo Samorì   +2 more
wiley   +1 more source

One-pot Microwave-Assisted Synthesis of 1H-Phenanthro[9,10- d][1,2,3]triazole

Molbank, 2008
In this study, a fast and good yield one-pot microwave-assisted synthesis (45 seconds) of 1H-phenanthro[9,10-d][1,2,3]triazole by a 1,3-dipolar cycloaddition reaction of sodium azide and 9-bromophenanthrene in the presence of potassium tert-butoxide in ...
Mehrak Faraji, Avat Arman Taherpour
doaj   +1 more source