Results 81 to 90 of about 37,807 (249)

Regioselective Synthesis of Multisubstituted Pyrazoles via Cyclocondensation of β-Thioalkyl-α,β-Unsaturated Ketones with Hydrazines

, 2011
Regioselective Synthesis of Multisubstituted Pyrazoles via Cyclocondensation of β-Thioalkyl-α,β-Unsaturated Ketones with ...
于海丰, 金伟伟, 余正坤
core  

Bridging Stability and Reactivity: Novel Dinucleating Ligand With Rigid Backbone Stabilizes a Cu2O2 Side‐On Peroxido Structure

European Journal of Inorganic Chemistry, EarlyView.
The herein‐developed tyrosinase model complex enables the transfer of tyrosinase‐like catalytic oxygenation activity into artificial systems. Therefore, it enables the use of molecular oxygen for oxygenation and oxidation of phenolic substrates at room temperature.
Rosalie Dalhoff, Christine Charlotte Müller, Alexander Hoffmann, Sonja Herres‐Pawlis   +3 more
wiley   +1 more source

Reactions with Hydrazonoyl Halides. 31. Synthesis of Some New Pyrrolidino[3,4-c]pyrazolines, Pyrazoles, and Pyrazolo[3,4-d]pyridazines

Molecules, 2000
Pyrrolidino[3,4-c]pyrazoline and pyrazole derivatives were synthesized via reactions of a substituted hydrazonoyl bromide with N-arylmaleimides and active methylene reagents, respectively. Synthesized pyrazoles were reacted with hydrazine hydrate to give
Nagla A. Ahmed, Mohamed M. M. Sallam, Hussien F. Zohdi, Abdou O. Abdelhamid   +3 more
doaj   +1 more source

Two isostructural 3-(5-aryloxy-3-methyl-1-phenyl-1H-pyrazol-4-yl)-1-(thiophen-2-yl)prop-2-en-1-ones: disorder and supramolecular assembly

Acta Crystallographica Section E: Crystallographic Communications, 2020
Two new chalcones containing both pyrazole and thiophene substituents have been prepared and structurally characterized. 3-(3-Methyl-5-phenoxy-1-phenyl-1H-pyrazol-4-yl)-1-(thiophen-2-yl)prop-2-en-1-one, C23H18N2O2S (I), and 3-[3-methyl-5-(2-methylphenoxy)
Mohammed A. E. Shaibah, Hemmige S. Yathirajan, Nagaraj Manju, Balakrishna Kalluraya, Ravindranath S. Rathore, Christopher Glidewell   +5 more
doaj   +1 more source

Rh(III) catalyzed oxidative synthesis of pyrazoles from azomethines and acrylamides

, 2013
Rh(III) catalyzed oxidative synthesis of pyrazoles from azomethines and ...
李兴伟, 甄文翠, 杜正银
core  

1,1‐Disubstituted Vinylbromides: Versatile Building Blocks for the Synthesis of Nitrogen‐Containing Heterocycles

European Journal of Organic Chemistry, EarlyView.
1,1‐Disubstituted vinylbromides are key intermediates for constructing nitrogen‐containing heterocycles. This review provides an overview of the synthetic applications of 1,1‐disubstituted vinylbromides and summarizes recent developments in reaction methodologies, mechanistic insights, and the structural diversity of N‐heterocyclic compounds accessible
Anne Westermeyer, Jun Fang, Chonghuo Liu, Guillaume Lefèvre, Gérard Guillamot, Phannarath Phansavath, Virginie Ratovelomanana‐Vidal   +6 more
wiley   +1 more source

Synthesis and Antimicrobial Evaluation of Some Heterocyclic Chalcone Derivatives

Molecules, 2011
Some new heterocyclic compounds containing isoxazole, pyrazole and oxadiazole ring systems were prepared from various chalcones. The synthesized compounds have been characterized by elemental analysis and spectral methods.
Essam Mohamed Sharshira, Nagwa Mohamed Mahrous Hamada   +1 more
doaj   +1 more source

Catalyst-Free One-Pot Access to Pyrazoles and Disulfide-Tethered Pyrazoles via Deamidative Heteroannulation of beta-Ketodithioesters with Semicarbazide Hydrochloride in Water

, 2018
An operationally simple, mild, and catalyst-free one-pot protocol to access privileged pyrazoles and disulfide-tethered pyrazoles has been devised by 3+2] heteroannulation of beta-ketodithioesters with semicarbazide hydrochloride in water under open air.
Koley, Suvajit, Soni, Sonam, Panja, Sumit Kumar, Singh, Maya Shankar   +3 more
core   +1 more source

Gold(I)‐Mediated Reactivity of Allenes With Mesoionic Nucleophiles: A Computational Exploration

European Journal of Organic Chemistry, EarlyView.
The regioselective gold(I)‐mediated reactivity of allenes with mesoionic nucleophiles has been evaluated through computational analysis of the mechanisms involved. Instead of typical (3 + 2) pathways, sydnones and münchnones favour the formal (3 + 3) cyclizations affording substituted dihydropyridines.
Eduardo Garcia‐Padilla, Feliu Maseras
wiley   +1 more source

Synthesis, Crystal Structure, and Supramolecular Understanding of 1,3,5-Tris(1-phenyl-1H-pyrazol-5-yl)benzenes

Molecules, 2017
Understanding the supramolecular environment of crystal structures is necessary to facilitate designing molecules with desirable properties. A series of 12 novel 1,3,5-tris(1-phenyl-1H-pyrazol-5-yl)benzenes was used to assess the existence of planar ...
Marcos A. P. Martins, Alexandre R. Meyer, Paulo R. S. Salbego, Daniel M. dos Santos, Guilherme A. de Moraes, Helio G. Bonacorso, Nilo Zanatta, Clarissa P. Frizzo, Manfredo Hörner   +8 more
doaj   +1 more source