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Relevant bibliographies by topics / Oxazine derivatives

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Journal articles

Academic literature on the topic 'Oxazine derivatives'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Oxazine derivatives"

1

Gaonkar, Santosh L., Vignesh U. Nagaraj, and Swarnagowri Nayak. "A Review on Current Synthetic Strategies of Oxazines." Mini-Reviews in Organic Chemistry 16, no. 1 (2018): 43–58. http://dx.doi.org/10.2174/1570193x15666180531092843.

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In the past three decades, the heterocyclic oxazine cores have been intensely concerned. Oxazine derivatives are promising vital heterocyclic motifs. They are eminent for their synthetic potential and extensive biological properties. Oxazines are versatile intermediates for the synthesis of a variety of heterocycles and bifunctional compounds. Researchers have reported several synthetic approaches for the preparation of oxazines. This review emphasises the recent approaches for the synthesis of oxazine derivatives.

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2

Reissig, Hans-Ulrich, and Reinhold Zimmer. "Cyclizations of Alkoxyallenes: Mechanisms, Intermediates, Products – A Personal Account on Solved and Unsolved Problems with Unique Allene Building Blocks." Synthesis 49, no. 15 (2017): 3291–302. http://dx.doi.org/10.1055/s-0036-1588846.

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The additions of lithiated alkoxyallenes to electrophiles, such as carbonyl compounds, thioketones, imines, and nitrones, provide the expected primary addition products. These alkoxyallene intermediates undergo ring-closure reactions under quite different conditions. Whereas allenyl hydroxylamine derivatives spontaneously cyclize to 1,2-oxazine derivatives, the related allenyl amines, thiols, and alcohols require, with distinct exceptions, promotion by acids, base, silver(I), or gold(I). The different mechanisms of these processes are discussed in this account. The serendipitous discovery of a

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3

Sharma, Anupama, Sarita Khaturia, and Har Lal Singh. "Synthesis of New Schiff Base of 1,3-Oxazine and 1,3-Thiazine Derivatives Derived from 4-Phenyl Substituted Chalcones and Evaluation of their Antibacterial Activity." Asian Journal of Chemistry 33, no. 3 (2021): 531–36. http://dx.doi.org/10.14233/ajchem.2021.23050.

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Oxazine and thiazine heterocycles have distinctive interests due to their important class of natural and non-natural products and exhibit high biological activities in the pharmaceutical and biological fields. This work was planned to synthesize Schiff base of 1,3-oxazine and 1,3-thiazine derivative from 4-phenyl substituted chalcones. The structures of the newly synthesized targeted compounds were established from UV, IR, 1H NMR, 13C NMR and DFT calculations. The molecular properties HOMO-LUMO energy, energy gap, softness and harness were calculated using DFT/B3LYP/6-311G (d,p) basis set. in

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4

Thirunarayanan, Ganesamoorthy, R. Sundararajan, and R. Arulkumaran. "Aryl Chalcones as Efficient Precursors for Deriving Oxazine: Solvent-Free Synthesis and Antimicrobial Activities of some Oxazine-2-amines." International Letters of Chemistry, Physics and Astronomy 23 (November 2013): 82–97. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.23.82.

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A series of some oxazine derivatives has been synthesised by fly-ash:H2SO4 catalyzed solvent-free cyclization of aryl chalcones and urea under microwave irradiation. The yields of the oxazines were more than 85%. The synthesised oxazines were characterized by their physical constants, analytical and spectroscopic data. The antimicrobial activities of these oxazines have been studied using Bauer-Kirby method.

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5

Medvecký, Michal, Igor Linder, Luise Schefzig, Hans-Ulrich Reissig, and Reinhold Zimmer. "Iodination of carbohydrate-derived 1,2-oxazines to enantiopure 5-iodo-3,6-dihydro-2H-1,2-oxazines and subsequent palladium-catalyzed cross-coupling reactions." Beilstein Journal of Organic Chemistry 12 (December 29, 2016): 2898–905. http://dx.doi.org/10.3762/bjoc.12.289.

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Iodination of carbohydrate-derived 3,6-dihydro-2H-1,2-oxazines of type 3 using iodine and pyridine in DMF furnished 5-iodo-substituted 1,2-oxazine derivatives 4 with high efficacy. The alkenyl iodide moiety of 1,2-oxazine derivatives syn-4 and anti-4 was subsequently exploited for the introduction of new functionalities at the C-5 position by applying palladium-catalyzed carbon–carbon bond-forming reactions such as Sonogashira, Heck, or Suzuki coupling reactions as well as a cyanation reaction. These cross-coupling reactions led to a series of 5-alkynyl-, 5-alkenyl-, 5-aryl- and 5-cyano-substi

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6

Lauro, Figueroa-Valverde, Díaz-Cedillo Francisco, Rosas-Nexticapa Marcela, et al. "Design and Synthesis of Two Oxazine Derivatives Using Several Strategies." Journal of Chemistry 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/757953.

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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-10-yl)-amino]-ethyl}-[1,5-dimethyl-4-(1H-naphtho[1,2-e][1,3-oxazin-2-yl)-2-phenyl-2,3-dihydro-1H-pyrazol-3-yl]-amino}-cyclobutanone and 2-chloro-3-{{2-[(3-chloro-2-oxo-cyclobutyl)-(1,7,7-trimethyl-bicyclo[2.2.1]hept-2-yl)-amino]-ethyl}-[1,5-dimethyl-4-(1H-naphtho[1,2-e][1,3]oxazin-2-yl)-2-phenyl-2,3-dihydro-1H-pyrazol-3-yl]-amino}-cyclobutanone

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7

Jasiński, Marcin, Dieter Lentz, and Hans-Ulrich Reissig. "Carbohydrate-auxiliary assisted preparation of enantiopure 1,2-oxazine derivatives and aminopolyols." Beilstein Journal of Organic Chemistry 8 (April 30, 2012): 662–74. http://dx.doi.org/10.3762/bjoc.8.74.

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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. This key step proceeded only with moderate diastereoselectivity, but allowed entry into both enantiomeric series of the resulting 3,6-dihydro-2H-1,2-oxazines. Their enol ether double bond was then subjected to a hydroboration followed by an oxidative work-up, and finally the auxiliary was removed. The described three-step procedure enabled the synthesis of enantiopure hydroxylated 1,2-oxazines.

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8

Chovatiya, Pankaj, Charmy Mehta, Hardik Senjani, Anamik Shah, and Hitendra S. Joshi. "Synthesis and Characterization of some New Schiff Bases of 2-Oxonaphtho[2,1-b][1,4]Oxazine." International Letters of Chemistry, Physics and Astronomy 31 (March 2014): 26–30. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.31.26.

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The literature review reveal that [1,4]-oxazine derivatives represent one of the most active classes of compounds possessing wide spectrum of biodynamic activities and use as potent therapeutic agents. In the present work, a series of Schiff base of 2-(2,3-dihydro-2-oxonaphtho[2,1-b][1,4]oxazin-1-yl)acetohydrazide, 5a-5j has been synthesized using 1-aminonaphthalen-2-ol. Various aromatic aldehyde were react with carbohydrazide 4 in the presence of acid to produce the 2-oxonaphtho[2,1-b][1,4]oxazin Schiff base derivatives with good yields. All synthesized compounds were characterized by IR, NMR

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9

Bouché, Léa, and Hans-Ulrich Reissig. "Synthesis of novel carbohydrate mimetics via 1,2-oxazines." Pure and Applied Chemistry 84, no. 1 (2011): 23–36. http://dx.doi.org/10.1351/pac-con-11-09-20.

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The combination of lithiated alkoxyallenes with carbohydrate-derived nitrones constitutes a flexible entry to highly functionalized enantiopure 1,2-oxazine derivatives. They can be used as precursors for acyclic and cyclic carbohydrate-like products such as amino sugar alcohols, azetidine and pyrrolidine derivatives. The Lewis acid-promoted rearrangement of 1,3-dioxolanyl-substituted 1,2-oxazines to bicyclic compounds allows an efficient route to novel amino pyran and oxepane derivatives. After subsequent transformations, new carbohydrate mimetics or “real” carbohydrates were obtained in good

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10

Fišera, Lubor, Marta Konopíková, Ladislav Štibrányi, and Hans-Joachim Timpe. "Solvent and substituent effects on rearrangement of 4-(4-X-phenyl)-2,7-dioxa-3-azabicyclo[3,3,0]oct-3-enes." Collection of Czechoslovak Chemical Communications 50, no. 9 (1985): 1971–81. http://dx.doi.org/10.1135/cccc19851971.

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Preparation of the title compounds V is described. They give, on irradiation, the 2,3-dihydro-6H-1,3-oxazine derivatives VI as the main products besides the tetrahydrofuro[3,4-d]oxazoline derivatives VII. The VI to VII product ratio depends on the substituent bound to the aromatic residue. Polar solvents favour formation of the VI derivatives in the order Cl >H > CH3. In non-polar solvents the proportion of VII is increased. The quantum yields of the photoreaction vary within the limits from 0.006 to 0.04 (H >F > Cl > CH3 > OCH3).

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