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Journal articles on the topic 'Oxazine derivatives'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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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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11

Pathan, Mosim, and Faiz Khan. "Synthesis of Substituted Pyrido-oxazine through Tandem SN2 and SNAr Reaction." SynOpen 02, no. 02 (2018): 0150–60. http://dx.doi.org/10.1055/s-0036-1591960.

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Pyrido-oxazine derivatives have been synthesized by employing tandem SN2 and SNAr reaction between 2,4,6-tribromo-3-(2-bromoethoxy)pyridine or 2,4,6-tribromo-3-(3-bromopropoxy)pyridine and a variety of primary amines. Moderate to good regioselectivity in favor of cyclization at the 2-position is observed. Pyrido-oxazine products thus generated are converted into biarylated pyrido-oxazine and terpyridine ligands.

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12

Cui, Shaoying, Carlos R. Arza, Pablo Froimowicz, and Hatsuo Ishida. "Developing Further Versatility in Benzoxazine Synthesis via Hydrolytic Ring-Opening." Polymers 12, no. 3 (2020): 694. http://dx.doi.org/10.3390/polym12030694.

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In this study, 2-(aminomethyl)phenol and its derivatives, the reactants for 2-substituted 1,3-benzoxazines, are synthesized by HCl hydrolysis from the typical benzoxazines. The phenol/aniline-based mono-oxazine benzoxazine, PH-a, and the bisphenol A/aniline-based bis-oxazine benzoxazine, BA-a, are used as examples to demonstrate the feasibility of this new approach. Their chemical structures are characterized by nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR) and Raman spectroscopies, and are further verified by elementary analysis. Their thermal properties are studied by d

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13

Mahmoud, Naglaa F. H., Eman A. El-Bordany, and Galal A. Elsayed. "Synthesis and Pharmacological Activities of Pyrano[2,3-d]pyrimidine and Pyrano[2,3-d]pyrimidine-5-one Derivatives as New Fused Heterocyclic Systems." Journal of Chemistry 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/5373049.

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Various fused oxazine such as 4-(4-methoxyphenyl)-3,7-dimethyl-1,4-dihydro-5H-pyrazolo [4′,3′:5,6]pyrano[2,3-d][1,3]oxazin-5-one2has been prepared and utilized as a starting material for novel pyrazolopyranopyrimidinones3,5,6, and7a–cand pyrazolopyranopyrimidines4,9,10, and11which are expected to possess considerable chemical and pharmacological activities. The structures of the new compounds have been elucidated by spectroscopic data and elemental analysis. The antioxidant and anticancer activities of synthesized products have been evaluated.

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14

Bouché, Léa, Maja Kandziora, and Hans-Ulrich Reissig. "Synthesis of new enantiopure poly(hydroxy)aminooxepanes as building blocks for multivalent carbohydrate mimetics." Beilstein Journal of Organic Chemistry 10 (January 20, 2014): 213–23. http://dx.doi.org/10.3762/bjoc.10.17.

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New compounds with carbohydrate-similar structure (carbohydrate mimetics) are presented in this article. Starting from enantiopure nitrones and lithiated TMSE-allene we prepared three 1,2-oxazine derivatives which underwent a highly stereoselective Lewis acid-induced rearrangement to give bicyclic products in good yield. Subsequent reductive transformations delivered a library of new poly(hydroxy)aminooxepane derivatives. The crucial final palladium-catalyzed hydrogenolysis of the 1,2-oxazine moiety was optimized resulting in a reasonably efficient approach to a series of new seven-membered ca

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15

Brulíková, Lucie, Aidan Harrison, Marvin J. Miller, and Jan Hlaváč. "Stereo- and regioselectivity of the hetero-Diels–Alder reaction of nitroso derivatives with conjugated dienes." Beilstein Journal of Organic Chemistry 12 (September 1, 2016): 1949–80. http://dx.doi.org/10.3762/bjoc.12.184.

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The hetero-Diels–Alder reaction between a nitroso dienophile and a conjugated diene to give the 3,6-dihydro-2H-1,2-oxazine scaffold is useful for the synthesis of many biologically interesting molecules due to the diverse opportunities created by subsequent transformations of the resulting 1,2-oxazine ring. This review discusses the rationale for the observed regio- and stereoselectivity and the methods developed in recent years used to control and improve the stereo- and regioselectivity for the synthesis of 1,2-oxazine scaffolds.

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16

Ande, Shailaja, Khadar Shaik, Ravi Dharmoji, Nisa Firdouse, Anjum Mohd, and Sowmya Yelwarthi. "Pharmacological evaluation of oxazine sulfonamide derivatives for anti-inflammatory, analgesic and antipyretic activities." International Journal of Pharmacology and Toxicology 4, no. 2 (2016): 111. http://dx.doi.org/10.14419/ijpt.v4i2.6123.

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Oxazine heterocyclic compound containing one oxygen and one nitrogen atom. They possess different pharmacological activities like anticancer, anti-ulcer, antifungal, antithrombotic, antihypertensive, analgesic, anti-inflammatory etc. Oxazine Sulphonamide derivatives were investigated for anti-inflammatory, analgesic and anti-pyretic activities. It was evaluated for anti-inflammatory activity by carrageenan induced paw edema in rats using Plethysmometer and it also shows significant analgesic effect in male Albino mice. Antipyretic activity was also investigated.

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17

Akiba, Masaharu, Alexander S. Dvornikov, and Peter M. Rentzepis. "Formation of oxazine dye by photochemical reaction of N-acyl oxazine derivatives." Journal of Photochemistry and Photobiology A: Chemistry 190, no. 1 (2007): 69–76. http://dx.doi.org/10.1016/j.jphotochem.2007.03.014.

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18

Andrews, PR, V. Cody, JM Gulbis, et al. "Structure and Conformations of Gaba-Transaminase Inhibitors. II. Transition-State Analogs." Australian Journal of Chemistry 39, no. 10 (1986): 1575. http://dx.doi.org/10.1071/ch9861575.

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Crystal structures of two benzoxazine derivatives designed as transition state analogue inhibitors of GABA-T were determined. These cyclic oxazine structures are shown to be more similar to the proposed transition state than the pyridoxal derivatives reported in the preceding article.1 Conformational analyses (non-bonded energy, MINDO/3, MNDO) show that the crystal structures are close to the calculated energy minima. The MNDO parameterization gives geometries close to the crystal structure, with the configuration at the nitrogen of the oxazine ring in particular being better reproduced than b

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19

Zhang, Guo-Yan, Yang Xiang, Zhi Guan, and Yan-Hong He. "Enzyme and photoredox sequential catalysis for the synthesis of 1,3-oxazine derivatives in one pot." Catalysis Science & Technology 7, no. 9 (2017): 1937–42. http://dx.doi.org/10.1039/c6cy02682f.

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20

Gupta, Nidhi, Sonia Sharma, Arun Raina, Nisar A. Dangroo, Shashi Bhushan, and Payare L. Sangwan. "Synthesis and anti-proliferative evaluation of novel 3,4-dihydro-2H-1,3-oxazine derivatives of bakuchiol." RSC Advances 6, no. 108 (2016): 106150–59. http://dx.doi.org/10.1039/c6ra23757f.

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21

Saá, Carlos, and Jesús Varela. "Metal-Catalyzed Cyclizations to Pyran and Oxazine Derivatives." Synthesis 48, no. 20 (2016): 3470–78. http://dx.doi.org/10.1055/s-0035-1562466.

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22

Muntean, Luminita, Ion Grosu, and Sorin Mager. "ChemInform Abstract: Synthesis of Perhydro-1,3-oxazine Derivatives." ChemInform 33, no. 52 (2010): no. http://dx.doi.org/10.1002/chin.200252241.

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23

Fuchigami, Toshio, Bin Yin, and Shinsuke Inagi. "Selective Fluorodesulfurization of Benzo- and Pyrido-oxazine Derivatives." Synlett 2010, no. 14 (2010): 2146–50. http://dx.doi.org/10.1055/s-0030-1258517.

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24

Ghosh, Sukhen Chandra, and Asish De. "A convenient synthesis of benz-1,2-oxazine derivatives." Chemical Communications, no. 11 (2000): 979–80. http://dx.doi.org/10.1039/b002509g.

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25

Cho, Sung Yun, Ji Yoen Baek, Sang Sub Han, et al. "PTP-1B inhibitors: Cyclopenta[d][1,2]-oxazine derivatives." Bioorganic & Medicinal Chemistry Letters 16, no. 3 (2006): 499–502. http://dx.doi.org/10.1016/j.bmcl.2005.10.062.

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26

Journal, Baghdad Science. "Synthesis and Characterization of Some Novel Oxazine, Thiazine and Pyrazol Derivatives." Baghdad Science Journal 13, no. 2 (2016): 244–52. http://dx.doi.org/10.21123/bsj.13.2.244-252.

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In this paper, some chalcone derivatives (C1, C2) were synthesized based on the reaction of equal amount of substituted acetophenone and substituted banzaldehyde in basic medium. Oxazine and thiazine derivatives were prepared from the reaction of chalcones (C1-C2) with urea and thiourea respectively in a basic medium. Pyrazole derivatives were prepared based on the reaction of chalcones with hydrazine mono hydrate or phenyl hydrazine in the presence of glacial acetic acid as a catalyst. The new synthesized compounds were identified using various physical techniques like1 H-NMR and FT-IR spectr

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27

Chaskar, Atul, Vimal Vyavhare, Vikas Padalkar, Kiran Phatangare, and Hrushikesh Deokar. "An environmentally benign one-pot synthesis of 1,2-dihydro-1-arylnaphtho[1,2-e][1,3]oxazine-3-one derivatives catalysed by phosphomolybdic acid." Journal of the Serbian Chemical Society 76, no. 1 (2011): 21–26. http://dx.doi.org/10.2298/jsc100410016c.

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A phosphomolybdic acid catalysed novel method for the synthesis of 1,2-dihydro-1-arylnaphtho[1,2-e][1,3]oxazine-3-one derivatives by a one-pot, three-component reaction of ?-naphthol, aromatic aldehydes and urea in excellent yields is described.

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28

Journal, Baghdad Science. "Synthesis and characterization of new Oxazine , Thiazine and Pyrazol derived from chalcones." Baghdad Science Journal 11, no. 2 (2014): 477–85. http://dx.doi.org/10.21123/bsj.11.2.477-485.

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In this study, chalcones were synthesis by condensing 2-acetylpyridine with aromatic aldehyde derivatives in dilute ethanolic potassium hydroxide solution at room temperature according to Claisen-Schmidt condensation. After that, new heterocyclic derivatives such as Oxazine, Thiazine and Pyrazol were synthesis by reaction between chalcones with urea, thiourea and hydrazine hydrate respectively scheme 1. All these compounds wrer characterization by FTIR, 1H-NMR spectroscopy and elemental analysis.

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29

Maniewska, Jadwiga, Benita Wiatrak, Żaneta Czyżnikowska, and Berenika M. Szczęśniak-Sięga. "Synthesis of New Tricyclic 1,2-Thiazine Derivatives with Anti-Inflammatory Activity." International Journal of Molecular Sciences 22, no. 15 (2021): 7818. http://dx.doi.org/10.3390/ijms22157818.

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New, tricyclic compounds containing a sulfonyl moiety in their structure, as potential safer COX inhibitors, were designed and synthesized. New derivatives have three conjugated rings and a sulfonyl group. A third ring, i.e., an oxazine, oxazepine or oxazocin, has been added to the 1,2-benzothiazine skeleton. Their anti-COX-1/COX-2 and cytotoxic effects in vitro on NHDF cells, together with the ability to interact with model membranes and the influence on reactive oxygen species and nitric oxide, were studied. Additionally, a molecular docking study was performed to understand the binding inte

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30

Miri, Morteza, and Alireza Hassanabadi. "One-Pot and Three-Component Condensation of Kojic Acid with Aromatic Aldehydes and Methyl Carbamate: Synthesis of Pyrano-1,3-Oxazine Derivatives in Aqueous Media." Journal of Chemical Research 42, no. 8 (2018): 416–18. http://dx.doi.org/10.3184/174751918x15341755203029.

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A novel method for oxazine ring formation has been established using the reaction of kojic acid and aromatic aldehydes with methyl carbamate in the presence of p-toluenesulfonic acid in aqueous media to afford 4-aryl-6-hydroxymethyl-1,4-dihydropyrano[3,2-e][1,3] oxazine-2,8-diones in excellent yields. The present method does not involve any hazardous organic solvent. Therefore, this procedure could be classified as green chemistry.

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31

Ručilová, Veronika, Petra Králová, and Miroslav Soural. "Synthesis of Disubstituted Pyrazino-Oxazine Derivatives with Controlled Stereochemistry." European Journal of Organic Chemistry 2017, no. 47 (2017): 7034–39. http://dx.doi.org/10.1002/ejoc.201701448.

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32

Tret'yakova, E. V., O. B. Flekhter, F. Z. Galin, and G. A. Tolstikov. "Synthesis of Phenyl-2,3-oxazine Derivatives of Chrysenequinonecarboxylic Acid." Chemistry of Natural Compounds 40, no. 4 (2004): 391–93. http://dx.doi.org/10.1023/b:conc.0000048255.87504.d0.

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33

Didwagh, Sayaji S., and Pravina B. Piste. "ChemInform Abstract: Green Synthesis of Thiazine and Oxazine Derivatives." ChemInform 44, no. 47 (2013): no. http://dx.doi.org/10.1002/chin.201347214.

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34

Neidlein, Richard, Zhijun Wang, and Walter Kramer. "Syntheses and Structure Elucidation of Dimethylaminovinyl Substituted 1,3-Oxazines and Pyrazolo[3,4-d][3,1]oxazine Derivatives." HETEROCYCLES 51, no. 12 (1999): 2893. http://dx.doi.org/10.3987/com-99-8696.

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35

Liu, Feize, Xueling Hou, Li Nie, Khurshed Bozorov, Michael Decker, and Guozheng Huang. "A Convenient One-pot Synthesis of 2,3-Disubstituted Thieno[2,3-d]pyrimidin-4(3H)-ones from 2H-Thieno[2,3-d][1,3]oxazine-2,4(1H)-diones, Aromatic Aldehydes and Amines." SynOpen 02, no. 02 (2018): 0207–12. http://dx.doi.org/10.1055/s-0037-1610157.

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An efficient, simple protocol has been established for convenient synthesis of novel 2,3-disubstituted thieno[2,3-d]pyrimidin-4(3H)-one derivatives in good to high yields through a one-pot, two-step and three-component reaction from 2H-thieno[2,3-d][1,3]oxazine-2,4(1H)-diones, aromatic aldehydes, and amines.

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36

Reissig, Hans-Ulrich, Wolfgang Schade, G. Marlyse Okala Amombo, Robert Pulz, and Arndt Hausherr. "Stereoselective syntheses of heterocycles via metallated alkoxyallenes." Pure and Applied Chemistry 74, no. 1 (2002): 175–80. http://dx.doi.org/10.1351/pac200274010175.

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n-Butyllithium smoothly deprotonates alkoxyallenes at C-1. The generated lithiated species reacts with a variety of electrophiles furnishing after cyclization functionalized furan, pyrrole, or 1,2-oxazine derivatives. The formation of new CC bonds often occurs with high stereoselectivities, which are exploited for efficient and selective syntheses of natural products or other compounds of interest.

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37

Sun, Yi, Wenfei Huang, Zhiqiang Li, Tao Wang, and Jin Luo. "Design, synthesis, and herbicidal activity of novel 2-(arylamino)-5-methyl-4-methylene-7-(methylthio)-4H-pyrido[4,3-d][1,3]oxazine-8-carbonitrile derivatives." Journal of Chemical Research 43, no. 3-4 (2019): 119–23. http://dx.doi.org/10.1177/1747519819845771.

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A series of 5-methyl-4-methylene-7-methylthio-2-arylmino-4 H-pyrido[4,3- d][1,3]oxazine-8-carbonitrile derivatives were synthesized via tandem aza-Wittig and annulation reactions with { N-[3-acetyl-5-cyano-2-methyl-6-(methylthio)pyridin-4-yl]imino}triphenylphosphorane and aryl isocyanate in dry dichloromethane. Their structures were clearly confirmed by infrared, 1H NMR, 13C NMR, high-resolution mass spectrometry, and X-ray single-crystal diffraction. All newly synthesized compounds were screened for herbicidal activities against monocotyledonous and dicotyledonous plants. The results indicate

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38

Sharma, Satyasheel, and Mahendra Nath. "Synthesis of meso-substituted dihydro-1,3-oxazinoporphyrins." Beilstein Journal of Organic Chemistry 9 (March 7, 2013): 496–502. http://dx.doi.org/10.3762/bjoc.9.53.

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Novel dihydro-1,3-oxazinoporphyrins and naphtho[e]bis(dihydro-1,3-oxazinoporphyrin) derivatives, in which the porphyrin macrocycle is covalently linked to the dihydro-1,3-oxazine ring system were successfully synthesized from 5-(4-aminophenyl)-10,15,20-triphenylporphyrin in good yields. The structures of the target products were established on the basis of spectral data and elemental analyses.

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39

Thirunarayanan, Ganesamoorthy, and K. G. Sekar. "Hammett Spectral Correlations in some Aryl 1,3-Oxazine-4-Thione Derivatives." International Letters of Chemistry, Physics and Astronomy 36 (July 2014): 193–200. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.36.193.

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A series of some aryl 1,3-oxazine-4-thione derivatives have been synthesized by 1-methyl imidazole catalyzed three component one pot synthetic method in room temperature. The purities of these thiones were studied by their physical constants and spectroscopic data. The infrared and 13C NMR spectral data of CN and CS were correlated with Hammett substituent constants, F and R parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituent on the spectral data was studied

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40

Shang, Xiao-Jie, and Zhong-Quan Liu. "A Catalyzed Aerobic Intramolecular C–O Bond Formation: Facile Access to Ring-Fused Dihydrobenzoxazine Derivatives." Synthesis 49, no. 20 (2017): 4693–97. http://dx.doi.org/10.1055/s-0036-1588465.

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A catalyst comprising of catalytic cobalt(II) acetate/copper(II) acetate/dl-tyrosine with oxygen as the oxidant allows aerobic intramolecular C–O bond construction in [2-(pyrrolidin-1-yl)phenyl]methanol by free-radical promoted intramolecular selective functionalization of an (sp3)C–H bond by the alcohol, thus providing an environmentally friendly approach to 5H-benzo[d]pyrrolo[2,1-b][1,3]oxazine derivatives.

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41

Yin, Bin, Shinsuke Inagi, and Toshio Fuchigami. "ChemInform Abstract: Selective Fluorodesulfurization of Benzo- and Pyrido-oxazine Derivatives." ChemInform 42, no. 2 (2010): no. http://dx.doi.org/10.1002/chin.201102182.

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Ghosh, Sukhen Chandra, and Asish De. "ChemInform Abstract: A Convenient Synthesis of Benz-1,2-oxazine Derivatives." ChemInform 31, no. 39 (2000): no. http://dx.doi.org/10.1002/chin.200039145.

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Moloney, Gerard P., David J. Craik, and Magdy N. Iskander. "Carbon-13 NMR spectral analysis of oxazine derivatives and precursors." Magnetic Resonance in Chemistry 28, no. 9 (1990): 824–29. http://dx.doi.org/10.1002/mrc.1260280917.

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44

Velikorodov, A. V., N. G. Urlyapova, and A. D. Daudova. "Synthesis and antimycobacterial activity of carbamate derivatives of 1,2-oxazine." Pharmaceutical Chemistry Journal 40, no. 7 (2006): 380–82. http://dx.doi.org/10.1007/s11094-006-0132-5.

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Rostami-Charati, Faramarz, Zinatossadat Hossaini, Ebrahim Gharaee, and Mohammad A. Khalilzadeh. "One-Pot Three-Component Synthesis of Oxazine Derivatives in Water." Journal of Heterocyclic Chemistry 50, S1 (2013): E174—E177. http://dx.doi.org/10.1002/jhet.1112.

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Ikeda, Isao, Mitsuhiro Umino, and Mitsuo Okahara. "Synthesis of novel 6H-1,3-oxazine derivatives with perfluoroalkyl substituents." Journal of Organic Chemistry 51, no. 4 (1986): 569–71. http://dx.doi.org/10.1021/jo00354a038.

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Velikorodov, A. V. "ChemInform Abstract: Synthesis of Some Carbamate Derivatives of 1,2-Oxazine." ChemInform 32, no. 29 (2010): no. http://dx.doi.org/10.1002/chin.200129157.

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48

Haggam, Reda A., Essam Abdelghani Soylem, Mohammed Gomaa Assy, and Mariam Fikery Arastiedy. "Synthesis and Biological Activities of Some Condensed Oxazine and Pyrimidine Derivatives: Cyclization, Ring Transformation and Functionalization of Oxazine." Current Science 115, no. 10 (2018): 1893. http://dx.doi.org/10.18520/cs/v115/i10/1893-1903.

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49

Völker, Edgar, Manuela O'Connell, R. Martín Negri, and Pedro F Aramendía. "Thermal Back-Isomerization of Spirocyclic Naphtho-oxazine and Phenanthro-oxazine Derivatives in Alcohols, Nitriles, and Poly(alkyl methacrylates)." Helvetica Chimica Acta 84, no. 9 (2001): 2751. http://dx.doi.org/10.1002/1522-2675(20010919)84:9<2751::aid-hlca2751>3.0.co;2-h.

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Oremus, Vladimír, Lubor Fišera, and Hans-Joachim Timpe. "Preparation and photochemistry of 3-methoxycarbonyl substituted condensed isoxazolines." Collection of Czechoslovak Chemical Communications 52, no. 12 (1987): 2953–60. http://dx.doi.org/10.1135/cccc19872953.

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The 1,3-dipolar cycloaddition of methoxy- and ethoxycarbonylnitriloxide to 2,3- and 2,5-dihydrofuran, 2,3-dihydropyrane, 7-oxabicyclo[2,2,1]-2-heptene, and 1,3-dioxep-5-ene derivatives is described. The condensed isoxazolines Ia, IIIa, Va, Vb are rearranged on irradiation to give the methoxycarbonyl substituted enaminoaldehydes IIa, IVa, VIa, VIb, respectively. The photolysis of VIIc, VIIIa, VIIIc is connected with destruction. The quantum yields of the photorearrangement are higher than those of the phenyl substituted derivatives but lower than those of the corresponding cyano derivatives. Th

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