Results 31 to 40 of about 11,863 (256)

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

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

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

[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

Thermoresponsive Poly(2‐oxazine)s

Macromolecular Rapid Communications, 2011
AbstractThe monomers 2‐methyl‐2‐oxazine (MeOZI), 2‐ethyl‐2‐oxazine (EtOZI), and 2‐n‐propyl‐2‐oxazine (nPropOZI) were synthesized and polymerized via the living cationic ring‐opening polymerization (CROP) under microwave‐assisted conditions. pEtOZI and pnPropOZI were found to be thermoresponsive, exhibiting LCST behavior in water and their cloud point ...
Bloksma, M.M., Paulus, R.M., Kuringen, van, H.P.C., Woerdt, van der, F., Lambermont - Thijs, H.M.L., Schubert, U.S., Hoogenboom, R.   +6 more
openaire   +3 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

Yb(OTf)3‐Catalyzed Asymmetric [3+3] Cycloaddition of N‐Vinyl Nitrones with Activated Cyclopropanes to Prepare 1,2‐Oxazines

Chinese journal of chemistry
We described a Yb(OTf)3 combined with Pybox ligand catalyzed asymmetric [3+3] cycloaddition of N‐vinyl cinnamaldehyde nitrones with activated cyclopropanes to prepare various functionalized 1,2‐oxazines in 24%—95% yields and 22%—96% ee.
Yu‐Zheng Wu, Yue Leng, Yi‐Xin Chen, Shi‐Qiu Huang, Ning Zou, Chunhua Chen, Dong‐Liang Mo   +6 more
semanticscholar   +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

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

Solid-Phase Synthesis of ɤ-Lactone and 1,2-Oxazine Derivatives and Their Efficient Chiral Analysis. [PDF]

PLoS ONE, 2016
Derivatives of 3-methyl-3,6-dihydro-2H-1,2-oxazine-6-carboxylic acid prepared by regioselective hetero Diels-Alder reaction of arylnitroso compounds with sorbic acid were used for solid-phase synthesis of a library of derivatives that included ...
Sona Krupkova, Gonzalo Pazos Aguete, Leona Kocmanova, Tereza Volna, Martin Grepl, Lucie Novakova, Marvin John Miller, Jan Hlavac   +7 more
doaj   +1 more source