Results 11 to 20 of about 7,946 (266)

Design and Synthesis of Two Oxazine Derivatives Using Several Strategies [PDF]

, 2014
Several oxazine derivatives have been synthesized; nevertheless, expensive reagents and special conditions are required. Therefore, in this study, two oxazine derivatives (2-chloro-3-{{2-[-(3-chloro-2-oxo-cyclobutyl)-(2,3-dimethoxy-9,10-dihydrostrychnid ...
Díaz-Cedillo Francisco, Figueroa-Valverde Lauro, García-Cervera Elodia, Hau-Heredia Lenin, López-Ramos María, Pool-Gómez Eduardo, Rosas-Nexticapa Marcela, Sarabia-Alcocer Betty   +7 more
core   +4 more sources

Strain-Release-Driven Electrochemical Skeletal Rearrangement of Non-Biased Alkyl Cyclopropanes/Butanes. [PDF]

Angew Chem Int Ed Engl
Strain‐release‐driven reactions represent a powerful strategy to access a diverse array of chemical scaffolds. The direct activation of alkyl non‐biased cyclopropanes and cyclobutanes through electrochemical oxidation facilitates the formation of a wide range of oxazoline and oxazine derivatives, offering crucial insights into the oxidation of small ...
Qi J, Wang C, Wang G, O'Neill P, Reddy Dubbaka S, Ting Ang H, Chen X, Wu J.   +7 more
europepmc   +3 more sources

Synthesis and Polymerization of Thiophene-Bearing 2-Oxazolines and 2-Oxazines. [PDF]

Macromol Rapid Commun
Thiophene‐bearing 2Ox and 2Ozi monomers are produced by utilizing the Witte and Seeliger method. The monomers are characterized by spectroscopic methods and x‐ray diffraction to resolve structural data and properties. Homopolymers synthesized using thiophene‐substituted monomers produced thermally stable products and glass transition temperature can be
Lee A, Heck J, Goding J, Luxenhofer R, Green RA.   +4 more
europepmc   +2 more sources

Self-Organization in Dilute Aqueous Solutions of Thermoresponsive Star-Shaped Six-Arm Poly-2-Alkyl-2-Oxazines and Poly-2-Alkyl-2-Oxazolines [PDF]

, 2021
The behavior of star-shaped six-arm poly-2-alkyl-2-oxazines and poly-2-alkyl-2-oxazolines in aqueous solutions on heating was studied by light scattering, turbidimetry and microcalorimetry.
Aseyev, Vladimir, Filippov, Alexander, Kirila, Tatyana, Smirnova, Anna, Tenhu, Heikki, Tenkovtsev, Andrey   +5 more
core   +4 more sources

Self Cycloaddition of o‐Naphthoquinone Nitrosomethide to (±) Spiro{naphthalene(naphthopyranofurazan)}‐one Oxide: An Insight into its Formation

ChemPlusChem, Volume 87, Issue 12, December 2022., 2022
2‐Hydroxy‐1‐naphthaldehyde oxime was oxidized by a D−A type self cycloaddition to spiro compound. Free reaction energy is calculated at −82.0 kcal/mol indicating its predominance over the intramolecular cyclization of −37.6 kcal/mol. 8‐methoxy substituted oxime is sterically guided to 9‐methoxynaphtho[1,2‐d] instead of spiro adduct resulting to the ...
Demeter Tzeli, Ioannis E. Gerontitis, Ioannis D. Petsalakis, Petros G. Tsoungas, George Varvounis   +4 more
wiley   +1 more source

Switchable Coumarins for Ratiometric pH Sensing

Frontiers in Materials, 2021
A fluorescent chromophore and a pH-sensitive heterocycle were integrated within a single covalent skeleton to generate four molecular switches with ratiometric fluorescence response.
Mercedes M. A. Mazza, Francesca Cardano, Francesca Cardano, Francesca Cardano, James D. Baker, Silvia Giordani, Silvia Giordani, Françisco M. Raymo   +7 more
doaj   +1 more source

Oxazinethione Derivatives as a Precursor to Pyrazolone and Pyrimidine Derivatives: Synthesis, Biological Activities, Molecular Modeling, ADME, and Molecular Dynamics Studies

Molecules, 2021
In this study, we used oxazinethione as a perfect precursor to synthesize new pyrimidine and pyrazole derivatives with potent biological activities. Biological activities were determined for all compounds against A. flavus, E. coli, S.
Magda H. Abdellattif, Mohd Shahbaaz, M. M. H. Arief, Mostafa A. Hussien   +3 more
doaj   +1 more source

Use of Phenyl Formate as a CO Surrogate for the Reductive Cyclization of Organic Nitro Compounds to Yield Different N-Heterocycles: Avoiding the Use of Autoclaves and Pressurized Gases

Chemistry Proceedings, 2022
The reductive cyclization of different organic nitro compounds by carbon monoxide, catalyzed by transition metal complexes, is a very efficient and clean strategy for the synthesis of many N-heterocycles.
Fabio Ragaini, Francesco Ferretti, Manar Ahmed Fouad   +2 more
doaj   +1 more source

Synthesis, crystal structure and Hirshfeld surface analysis of 1,7-dimethyl-5a,6,11a,12-tetrahydrobenzo[b]benzo[5,6][1,4]oxazino[2,3-e][1,4]oxazine

Acta Crystallographica Section E: Crystallographic Communications, 2020
Molecules of the title compound, C16H16N2O2, occupy special positions on the twofold rotation axes. The heterocyclic ring adopts a slightly twisted envelope conformation with one of the two junction carbon atoms as the flap.
Emine Berrin Çınar, Semanur Yeşilbağ, Onur Erman Doğan, Erbil Ağar, Necmi Dege, Eiad Saif   +5 more
doaj   +1 more source

SUBSTITUTED 4-NITROSOPYRAZOLES IN THE DIELS-ALDER REACTION

Siberian Journal of Life Sciences and Agriculture, 2021
Background. 4-Nitrosopyrazoles have become widespread in the pharmaceutical industry and in chemistry due to their high reactivity and biological activity. However, the interaction of 3,5-substituted 4-nitroso-1H-pyrazoles with diene hydrocarbons has not
Darya S. Volkova, Arkadiy A. Popov, Evgeny V. Root, Alexey A. Kukushkin, George A. Suboch   +4 more
doaj   +1 more source