Results 31 to 40 of about 11,541 (257)

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

Oxazines: A New Class of Second-Order Nonlinear Optical Switches.

Journal of the American Chemical Society, 2016
A combined experimental-theoretical investigation has revealed that oxazine-based compounds are multiaddressable, multistate, and multifunctional molecular switches exhibiting contrasts of both linear and second-order nonlinear optical properties.
P. Beaujean, F. Bondu, Aurélie Plaquet, Jaume Garcia-Amorós, Janet Cusido, F. Raymo, F. Castet, V. Rodriguez, B. Champagne   +8 more
semanticscholar   +1 more source

[3 + 3]-Cycloaddition of α-Diazocarbonyl Compounds and N-Tosylaziridines: Synthesis of Polysubstituted 2 H-1,4-Oxazines through Synergetic Catalysis of AgOTf/Cu(OAc)2.

Organic Letters, 2019
An impressive and new [3 + 3]-cycloaddition of α-diazocarbonyl compounds with N-tosylaziridines via synergetic catalysis of AgOTf and Cu(OAc)2 has been well described, which offers efficient access to highly substituted 2 H-1,4-oxazine derivatives.
Shangwen Fang, Yanwei Zhao, Haiyan Li, Yonggao Zheng, Pengcheng Lian, X. Wan   +5 more
semanticscholar   +1 more source

Dynamic Exchange Reactions as Self‐Blowing Agents for the Production of Reprocessable Foams

Angewandte Chemie, EarlyView.
This study introduces an innovative approach to designing self‐blown foams by leveraging the irreversible and self‐catalyzed transesterification of alkylester which release alcohol gas as blowing agents. The morphology and thermo‐mechanical properties of these foams can be precisely tailored by modifying the precursor structure. Remarkably, they can be
Antoine Adjaoud, Anaë Girault‐Fodil, Farida Baraka, Vincent Boulic, Benoit Marcolini, Laura Puchot, Pierre Verge   +6 more
wiley   +2 more sources

Synthesis of New 1,3-Disubstituted-2,3-dihydro-1H-naphth[1,2e][1,3]oxazines

Molecules, 2007
1,3-Disubstituted-2,3-dihydro-1H-naphth[1,2-e][1,3]oxazines were prepared through the ring-closurereactions of the aminobenzylnaphthols with substituted aryl-andheteroarylaldehydes.
Adem Köycü, Emel Pelit, Zuhal Turgut
doaj   +1 more source

Carbohydrate-auxiliary assisted preparation of enantiopure 1,2-oxazine derivatives and aminopolyols

Beilstein Journal of Organic Chemistry, 2012
An approach to enantiopure hydroxylated 2H-1,2-oxazine derivatives is presented utilizing the [3 + 3] cyclisation of lithiated alkoxyallenes and an L-erythrose-derived N-glycosyl nitrone as precursors.
Marcin Jasiński, Dieter Lentz, Hans-Ulrich Reissig   +2 more
doaj   +1 more source

Synthesis of 3,6‐Dihydro‐2H‐[1, 2]‐Oxazines from Nitroarenes and Conjugated Dienes, Catalyzed by Palladium/Phenanthroline Complexes and Employing Phenyl Formate as a CO Surrogate

ChemCatChem, 2018
Palladium/phenanthroline catalyzed reduction of nitroarenes by in situ‐generated carbon monoxide, from the decomposition of phenyl formate, affords the corresponding nitrosoarenes. The latter are trapped by conjugated dienes to give the corresponding 3,6‐
Mohamed A. El-atawy, D. Formenti, F. Ferretti, F. Ragaini   +3 more
semanticscholar   +1 more source

Gold(i)-catalyzed 6-endo-dig azide-yne cyclization: efficient access to 2H-1,3-oxazines.

Chemical Communications, 2017
Denitrogenative 6-endo-dig azide-yne cyclization of α-propargyloxy-β-haloalkylazides was enabled by gold catalysis, thus providing 2H-1,3-oxazines. This rare cyclization mode in gold-catalyzed reactions of azide-yne substrates was demonstrated to be ...
G. Lonca, Ciputra Tejo, H. Chan, S. Chiba, F. Gagosz   +4 more
semanticscholar   +1 more source

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

Correction: Novel Synthetic Oxazines Target NF-κB in Colon Cancer In Vitro and Inflammatory Bowel Disease In Vivo. [PDF]

PLoS ONE, 2017
[This corrects the article DOI: 10.1371/journal.pone.0163209.].
Anilkumar C Nirvanappa, Chakrabhavi Dhananjaya Mohan, Shobith Rangappa, Hanumappa Ananda, Alexey Yu Sukhorukov, Muthu K Shanmugam, Mahalingam S Sundaram, Siddaiah Chandra Nayaka, Kesturu S Girish, Arunachalam Chinnathambi, M E Zayed, Sulaiman Ali Alharbi, Gautam Sethi, Basappa, Kanchugarakoppal S Rangappa   +14 more
doaj   +1 more source