Results 31 to 40 of about 8,948 (229)

Antiproliferative Activity of (−)‐Isopulegol‐based 1,3‐Oxazine, 1,3‐Thiazine and 2,4‐Diaminopyrimidine Derivatives

ChemistryOpen, 2022
A series of novel heterocyclic structures, namely 1,3‐oxazines, 1,3‐thiazines and 2,4‐diaminopyrimidines, were designed and synthesised. The bioassay tests demonstrated that, among these analogues, 2,4‐diaminopyridine derivatives showed significant ...
Fatima Z. Bamou, Dr. Tam M. Le, Bizhar A. Tayeb, Seyyed A. S. Tahaei, Dr. Renáta Minorics, Prof. Dr. István Zupkó, Prof. Dr. Zsolt Szakonyi   +6 more
doaj   +1 more source

Clerodendrum colebrookianum extract mediated synthesis of AgNPs and its effective application as a sustainable catalyst for Oxazine transformation in neat condition and antibacterial activity.

Chemical Physics Impact, 2022
Silver nanoparticles (AgNPs) were synthesized through greener route using the Ethanol extract of Clerodendrum colebrookianum leaves. The synthesized AgNPs were characterized and confirmed through using various analytical studies like FT-IR, UV–vis, XRD ...
Putusenla Imchen, Betokali K Zhimomi, Toka Swu, Tovishe Phucho   +3 more
doaj   +1 more source

CCXXXIX.—A new synthesis of oxazines [PDF]

J. Chem. Soc., Trans., 1921
n ...
Fairbourne, Arthur, Toms, Harold
openaire   +2 more sources

Palladium-catalyzed cross coupling reactions of 4-bromo-6H-1,2-oxazines

Beilstein Journal of Organic Chemistry, 2009
A number of 4-aryl- and 4-alkynyl-substituted 6H-1,2-oxazines 8 and 9 have been prepared in good yields via cross coupling reactions of halogenated precursors 2, which in turn are easily accessible by bromination of 6H-1,2-oxazines 1. Lewis-acid promoted
Reinhold Zimmer, Elmar Schmidt, Michal Andrä, Marcel-Antoine Duhs, Igor Linder, Hans-Ulrich Reissig   +5 more
doaj   +1 more source

[3+3]-Annulation of Cyclic Nitronates with Vinyl Diazoacetates: Diastereoselective Synthesis of Partially Saturated [1,2]Oxazino[2,3-b][1,2]oxazines and Their Base-Promoted Ring Contraction to Pyrrolo[1,2-b][1,2]oxazine Derivatives

Molecules, 2023
A rhodium(II)-catalyzed reaction of cyclic nitronates (5,6-dihydro-4H-1,2-oxazine N-oxides) with vinyl diazoacetates proceeds as a [3+3]-annulation producing bicyclic unsaturated nitroso acetals (4a,5,6,7-tetrahydro-2H-[1,2]oxazino[2,3-b][1,2]oxazines ...
Yulia A. Antonova, Yulia V. Nelyubina, Sema L. Ioffe, Andrey A. Tabolin   +3 more
doaj   +1 more source

Synthesis of Isoxazolines and Oxazines by Electrochemical Intermolecular [2 + 1 + n] Annulation: Diazo Compounds Act as Radical Acceptors.

Organic Letters, 2019
Reported herein is an unprecedented synthesis of isoxazolines and oxazines through electrochemical intermolecular annulation of alkenes with tert-butyl nitrite, in which diazo compounds serve as radical acceptors.
Mingteng Xiong, Xiao Liang, Zhan-Yong Gao, A. Lei, Yuanjiang Pan   +4 more
semanticscholar   +1 more source

One-pot synthesis of naphtho[1,2-e][1,3]oxazines in the presence of FNAOSiPAMP*/CuII as an almond shell based nanocatalyst

Scientific Reports, 2022
In the present research work, a novel catalyst based on natural material, namely, Fe3O4@nano-almondshell@OSi(CH2)3/NHCH2pyridine/CuII abbreviated (FNAOSiPAMP/CuII) was designed and prepared.
Mina Keihanfar, Bi Bi Fatemeh Mirjalili
doaj   +1 more source

Easy Access to New Heterocyclic Systems:  1,4-Oxazine and Substituted 1,4-Oxazines [PDF]

The Journal of Organic Chemistry, 2007
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Elise, Claveau, Isabelle, Gillaizeau, Jérome, Blu, Amélie, Bruel, Gérard, Coudert   +4 more
openaire   +2 more sources

Allosteric Regulation of Photophysics and Binding in Oxazine‐macrocycle Complexes at Single‐molecule Resolution

Angewandte Chemie, Volume 138, Issue 29, 13 July 2026.
This work explores the interactions between the oxazine dye ATTO655 and two macrocyclic hosts using optical (single‑molecule) spectroscopy. Although ATTO655 forms a classical inclusion complex with cucurbit[8]uril (CB8), its interaction with p‑sulfonatocalix[4]arene (sCX4) leads to the formation of dim exclusion complexes.
Siyu Lu, Thomas‐Otavio Peulen, Hongbin Wu, Florian Lindemann, Despoina Kapiki, Rasmus Linser, Andreas Hennig, Thorben Cordes   +7 more
wiley   +2 more sources

One-pot nucleophilic substitution–double click reactions of biazides leading to functionalized bis(1,2,3-triazole) derivatives

Beilstein Journal of Organic Chemistry, 2023
The nucleophilic substitution of benzylic bromides with sodium azide was combined with a subsequent copper-catalyzed (3 + 2) cycloaddition with terminal alkynes.
Hans-Ulrich Reissig, Fei Yu
doaj   +1 more source