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Journal articles on the topic ']oxazin-4-one'

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Published: 4 June 2021

Last updated: 13 February 2022

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1

El Haddad, Mohammadine, and Mohamed Akssira. "6-Methyl-1,3-diphenylpyrazolo[3,4-d]oxazin-4-one." Molecules 6, no. 12 (2001): M271. http://dx.doi.org/10.3390/m271.

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2

El-Shahawi, Manal M., and Ahmed K. El-Ziaty. "Enaminonitrile as Building Block in Heterocyclic Synthesis: Synthesis of Novel 4H-Furo[2,3-d][1,3]oxazin-4-one and Furo[2,3-d]pyrimidin-4(3H)-one Derivatives." Journal of Chemistry 2017 (2017): 1–6. http://dx.doi.org/10.1155/2017/5610707.

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2-Amino-4,5-diphenylfuran-3-carbonitrile 1 was utilized as building block for the construction of new furo[2,3-d]pyrimidin-4(3H)-one derivative 2 and 4H-furo[2,3-d][1,3]oxazin-4-one derivative 3 via treatment with acetic anhydride and benzoyl chloride, respectively. The 4H-furo[2,3-d][1,3]oxazin-4-one derivative 3 was transformed into novel furo[2,3-d]pyrimidin-4(3H)-ones 4–8, tetrazolylfuran derivative 10, and furo[3,2-d]imadazolone derivative 11 via reaction with various nitrogen nucleophiles. The structure features of the synthesized compounds were established from their spectral and elemen

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3

Campi, E. M., G. D. Fallon, A. Holmes, P. Perlmutter, and C. C. Teo. "cis-5-Methyl-4-phenyl-3-(4-toluenesulfonyl)-1,3-oxazin-2-one." Acta Crystallographica Section C Crystal Structure Communications 51, no. 2 (1995): 279–80. http://dx.doi.org/10.1107/s0108270194008838.

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4

Crane, Jonathan D., and Eleanor Rogerson. "2-(Adamantan-1-yl)-5-methylbenzo[d][1,3]oxazin-4-one." Acta Crystallographica Section E Structure Reports Online 60, no. 4 (2004): o669—o670. http://dx.doi.org/10.1107/s1600536804006907.

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5

Sevenard, D. V., D. Lorenz, and V. Ya Sosnovskikh. "Preparative synthesis of 4-methyl-2-(trifluoromethyl)-1,3-oxazin-6-one." Russian Chemical Bulletin 65, no. 3 (2016): 847–49. http://dx.doi.org/10.1007/s11172-016-1389-9.

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6

Shokol, Tetyana, Natalia Gorbulenko, and Volodymyr Khilya. "Synthesis of chromones, annulated with oxygen-containing heterocycles with two hetero atoms at C(7)-C(8) bond." French-Ukrainian Journal of Chemistry 7, no. 1 (2019): 121–39. http://dx.doi.org/10.17721/fujcv7i1p121-139.

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The present review represented the advanced synthetic strategies for chromones annulated at the C(7)-C(8) bond with five-membered, six-membered, and seven-membered oxygen-containing heterocycles with two heteroatoms, such as 6H-[1,3]dioxolo[4,5-h]chromen-6-one, 2,3-dihydro-7H-[1,4]dioxino[2,3-h]chromen-7-one, 3,4-dihydro-2H,8H-[1,4]dioxepino[2,3-h]chromen-8-one, 2,3-dihydro-1H,7H-chromeno[7,8-b][1,4]oxazin-7-one, 4H,12H-pyrano[2,3-a]phenoxazine-4-one and 9,10-dihydro-4H,8H-chromeno[8,7-e][1,3]oxazin-4-one. The biological activity of naturally occurring and modified synthetic fused hetarenochro

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7

Annor-Gyamfi, Joel K., and Richard A. Bunce. "4H-Benzo[d][1,3]oxazin-4-ones and Dihydro Analogs from Substituted Anthranilic Acids and Orthoesters." Molecules 24, no. 19 (2019): 3555. http://dx.doi.org/10.3390/molecules24193555.

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A one-pot route to 2-alkyl and 2-aryl-4H-benzo[d][1,3]oxazin-4-ones (also known as 4H-3,1-benzoxazin-4-ones) has been developed and studied. The method involves the reaction of aryl-substituted anthranilic acids with orthoesters in ethanol catalyzed by acetic acid. Additionally, we have also investigated the reaction under microwave conditions. Not all of the substrates were successful in yielding the target heterocycles as some of the reactions failed to undergo the final elimination. This process led to the isolation of (±)-2-alkyl/aryl-2-ethoxy-1,2-dihydro-4H-benzo[d][1,3]oxazin-4-ones. The

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8

Batey, R. A., D. B. MacKay, and A. J. Lough. "3-Butyl-5-hydroxy-4-iodohexahydropyrrolo[1,2-c][1,3]oxazin-1-one." Acta Crystallographica Section C Crystal Structure Communications 55, no. 8 (1999): 1362–63. http://dx.doi.org/10.1107/s0108270199004497.

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9

Bajpai, L. K., and A. P. Bhaduri. "Protease induced novel ring contraction reaction of 1,3-oxazin-4-one derivatives." Journal of Molecular Catalysis B: Enzymatic 1, no. 3-6 (1996): 103–7. http://dx.doi.org/10.1016/1381-1177(95)00018-6.

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10

Usachev, Sergey А., Kristina M. Tabatchikova, Dmitri V. Sevenard, and Vyacheslav Ya Sosnovskikh. "Reaction of 4-methyl-2-trifluoromethyl-1,3-oxazin-6-one with indoles." Chemistry of Heterocyclic Compounds 54, no. 9 (2018): 848–51. http://dx.doi.org/10.1007/s10593-018-2359-y.

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11

Thorimbert, Serge, Candice Botuha, and Kevin Passador. "‘Heteroaromatic Rings of the Future’: Exploration of Unconquered Chemical Space." Synthesis 51, no. 02 (2018): 384–98. http://dx.doi.org/10.1055/s-0037-1611279.

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William Pitt and co-workers have created a virtual exploratory heterocyclic library ‘VEHICLe’ containing over 200 unconquered bicyclic heteroaromatic rings, synthetically feasible with potential medicinal interest. Since the publication of the 22 ‘heteroaromatic rings of the future’ by Pitt in 2009, 15 of them have been successfully synthesized as bicyclic or polycyclic forms and evaluated for applications in both biology and material science. This short review presents the critical synthesis associated with innovative synthetic methodologies of the synthetically conquered ring scaffolds from

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12

Akbaş, Esvet, and Furgan Aslano??lu. "Syntheses of some new 1H-pyrazole, pyridazin-3(2H)-one, and oxazin-4-one derivatives." Heteroatom Chemistry 17, no. 1 (2006): 8–12. http://dx.doi.org/10.1002/hc.20170.

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13

Patel, Harun, Rahul Pawara, and Sanjay Surana. "Resolving the Mystery of Ring Opening in the Synthesis of Benzo[d][1, 3]oxazin-4-one and Quinazolin-4(3H)-one." Letters in Organic Chemistry 16, no. 11 (2019): 898–905. http://dx.doi.org/10.2174/1570178616666181217114030.

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Quinazoline is the six-membered heterocyclic ring system reported for its versatile biological activities. This characteristic feature of quinazoline makes it a good template for a lead generation library. Ring opening is one of the major concerns in the synthesis of quinazolin-4(3H)-one that results in diamide formation. Here, alternative fusion strategy is reported, which is a time-saving and costeffective method to overcome the ring opening problem associated with the synthesis of benzo[ d][1,3]oxazin-4-one and quinazolin-4(3H)-one.

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14

Osarumwense, Peter O. "Analgesic activity of newly synthesized 7-chloro–2–methyl-4H–benzo[d] [1,3]–oxazin–4–one and 3–amino-7-chloro-2–methyl-quinazolin-4(3H)–one." Ovidius University Annals of Chemistry 29, no. 1 (2018): 25–28. http://dx.doi.org/10.2478/auoc-2018-0003.

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Abstract The current study is aimed at the analgesic evaluation of quinazolinone derivatives. The quinazolinone derivatives 7-chloro-2-methyl-4H-benzo[d][1,3]-oxazin-4-one and 3-amino-7-chloro-2-methyl-quinazolin-4(3H)-one were evaluated pharmacologically for their in vivo analgesic activities by acetic acid induced writhing in mice. The compounds exhibited significant analgesic activity in the range of 74.67 - 83.80% in comparison to control.

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15

Zhiani, Rahele. "Synthesis of 4-selenylidene-4H,5H-chromeno[3,4-e][1,3]oxazin-5-one." Journal of Chemical Research 41, no. 8 (2017): 452–54. http://dx.doi.org/10.3184/174751917x15000317104501.

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A green and efficient synthesis of [1,3]oxazines has been achieved via a three-component, one-pot condensation of 4-hydroxycoumarin, potassium selenocyanate and acyl chlorides in the presence of N-methylimidazole under solvent-free conditions at ambient temperature.

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16

Morita, Yasuo, Masakazu Kaneko, Sumiko Matsuzawa, and Yutaka Yamamoto. "Facile and convenient synthesis of 2,6-disubstituted 4H-1,3-oxazin-4-one derivatives." Journal of Heterocyclic Chemistry 34, no. 2 (1997): 515–19. http://dx.doi.org/10.1002/jhet.5570340227.

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17

ABRAMSKI, W., Z. URBANCZYK-LIPKOWSKA, and M. CHMIELEWSKI. "ChemInform Abstract: Ring-Opening Tautomerism of 2-Substituted 1,3-Oxazin-4-one Derivatives." ChemInform 26, no. 16 (1995): no. http://dx.doi.org/10.1002/chin.199516038.

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18

Kurz, Thomas, Khalid Widyan, Claudia Wackendorff, and Katrin Schlüter. "One-Pot Synthesis of 4-Methoxy(aralkoxy)imino-areno[1,3]oxazin-2-ones." Synthesis 2004, no. 12 (2004): 1987–90. http://dx.doi.org/10.1055/s-2004-829146.

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19

Ghorbani, Hosein, and Ayoob Bazgir. "1-(4-Fluorophenyl)-2,3-dihydro-1H-naphtho[1,2-e][1,3]oxazin-3-one." Acta Crystallographica Section E Structure Reports Online 63, no. 3 (2007): o1495—o1496. http://dx.doi.org/10.1107/s160053680700829x.

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In the molecule of the title compound, C18H12FNO2, the oxazine ring is not planar and has a flattened boat conformation The dihedral angle between the benzene ring and the naphthalene system is 78.4 (3)°. In the crystal structure, intermolecular N—H...O hydrogen bonds link the molecules into dimers, which may be effective in the stabilization of the structure.

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20

Larksarp, Chitchamai, and Howard Alper. "Palladium-Catalyzed Cyclocarbonylation ofo-Iodophenols and 2-Hydroxy-3-iodopyridine with Heterocumulenes: Regioselective Synthesis of Benzo[e]-1,3-oxazin-4-one and Pyrido[3,2-e]-1,3-oxazin-4-one Derivatives." Journal of Organic Chemistry 64, no. 25 (1999): 9194–200. http://dx.doi.org/10.1021/jo991256u.

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21

Oleshchuk, Alena L., Zarina T. Shulgau, Tulegen M. Seilkhanov, Alexey S. Vasilchenko, Samat A. Talipov, and Ivan V. Kulakov. "Synthesis and Biological Activity of 4-(Pyridin-3-yl)-2-hydroxy-4-oxobut-2-enoic Acid Derivatives." Synlett 31, no. 02 (2019): 165–70. http://dx.doi.org/10.1055/s-0037-1610738.

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Claisen condensation reaction of diethyl oxalate with 1-[4-(furan-2-yl)-2-methyl-5-nitro-6-phenylpyridin-3-yl]ethan-1-one afforded (Z)-4-[4-(furan-2-yl)-2-methyl-5-nitro-6-phenylpyridin-3-yl]-2-hydroxy-4-oxobut-2-enoic acid. The latter reacted with various binucleophiles to form the corresponding 3,4-dihydroquinoxaline-2(1H)-one, 3,4-dihydro-2H-benzo[b][1,4]oxazin-2-one, and 1H-pyrazole derivatives. Biological screening of the obtained compounds revealed analgesic and antibacterial activity.

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22

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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23

Dyall, LK. "Mass-Spectra of Annelated 4H-3,1-Oxazin-4-ones." Australian Journal of Chemistry 42, no. 10 (1989): 1813. http://dx.doi.org/10.1071/ch9891813.

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Electron-impact fragmentation of 2-R-4H-3,1-benzoxazin-4-ones involves primary losses of CO2 and R; there is also loss of ketene when R is methyl. The ion RCO+ is a major daughter. Successive losses of CO2and RCN yield an ion m/z 76 formulated as dehydrobenzene radical cation. In the case of 2-methyl-4H-3,1-naphth[2,3-d]oxazin-4-one, the 2,3-dehydronaphthalene ion is produced efficiently, and linked scans (B/E) were used to demonstrate that it loses C4H2 ( diacetylene ) in a retro Diels-Alder reaction.

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24

Yamamoto, Yutaka, Yasuo Morita, Reiko Kikuchi, Emiko Yokoo, Kaori Ohtsuka, and Miwako Katoh. "Reaction of 6-Methyl-2-phenyl-4H-1,3-oxazin-4-one with Oxime Dianions." HETEROCYCLES 29, no. 8 (1989): 1443. http://dx.doi.org/10.3987/com-89-4996.

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25

Larksarp, Chitchamai, and Howard Alper. "ChemInform Abstract: Palladium-Catalyzed Cyclocarbonylation of o-Iodophenols and 2-Hydroxy-3-iodopyridine with Heterocumulenes: Regioselective Synthesis of Benzo[e]-1,3-oxazin-4-one and Pyrido[3,2-e]-1,3-oxazin-4-one Derivatives." ChemInform 31, no. 11 (2010): no. http://dx.doi.org/10.1002/chin.200011054.

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26

Ravikumar, Krishnan, Balasubramanian Sridhar, Jagadeesh Babu Nanubolu, Venkatasubramanian Hariharakrishnan, and Awadesh Narain Singh. "Structures of benzoxazine-fused triazoles as potential diuretic agents." Acta Crystallographica Section C Crystal Structure Communications 68, no. 8 (2012): o302—o307. http://dx.doi.org/10.1107/s0108270112029800.

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6,8-Dinitro-2,4-dihydro-1H-benzo[b][1,2,4]triazolo[4,3-d][1,4]oxazin-1-one, C9H5N5O6, (I), a potential diuretic, and its acetylacetone derivative (E)-2-(2-hydroxy-4-oxopent-2-en-3-yl)-6,8-dinitro-2,4-dihydro-1H-benzo[b][1,2,4]triazolo[4,3-d][1,4]oxazin-1-one, C14H11N5O8, (II), both crystallize from methanol but in centrosymmetric and noncentrosymmetric space groups, respectively. To the best of our knowledge, this is the first report of crystal structures of benzoxazine–triazole fused systems. The acetylacetone group in (II) exists as the keto–enol tautomer and is oriented perpendicular to the

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27

Hursthouse, M. B., M. Ciechanowicz-Rutkowska, M. Burgiel, and W. Zankowska-Jasinska. "5-Acetyl-6-methyl-3-phenyl-4-thioxo-3,4-dihydro-2H-1,3-oxazin-2-one." Acta Crystallographica Section C Crystal Structure Communications 50, no. 12 (1994): 2001–3. http://dx.doi.org/10.1107/s0108270194004993.

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28

Li, Hua‐Bin, Lei Li, Jun‐Xian Li, Ting‐Feng Han, Jing‐Li He, and You‐Quan Zhu. "Novel HPPD inhibitors: triketone 2 H ‐benzo[ b ][1,4]oxazin‐3(4 H )‐one analogs." Pest Management Science 74, no. 3 (2017): 579–89. http://dx.doi.org/10.1002/ps.4739.

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29

MORITA, Y., M. KANEKO, S. MATSUZAWA, and Y. YAMAMOTO. "ChemInform Abstract: Facile and Convenient Synthesis of 2,6-Disubstituted 4H-1,3-Oxazin-4- one Derivatives." ChemInform 28, no. 38 (2010): no. http://dx.doi.org/10.1002/chin.199738205.

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30

Schwenker, Gerhard, and Jianbing Chen. "1,2-dihydro-3,1-benzoxazin-4-one and 4-H-1,2-dihydro-pyrido-[2,3-d]-[1,3]-oxazin-4-one derivatives as potential prodrugs: Part II: Hydrolysis." Archiv der Pharmazie 324, no. 11 (1991): 887–90. http://dx.doi.org/10.1002/ardp.2503241112.

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31

Lee, Dong-Sheng. "Highly diastereoselective synthesis of pyrido[2,1-b][1,3]oxazin-4(6H)-one by intramolecular anodic oxidation." Tetrahedron: Asymmetry 20, no. 17 (2009): 2014–20. http://dx.doi.org/10.1016/j.tetasy.2009.08.017.

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32

Schwenker, Gerhard, and Jianbing Chen. "1,2-dihydro-3,1-benzoxazin-4-one and 4H-1,2-dihydro-pyrido-[2,3-d]-[1,3]-Oxazin-4-one derivatives as potential prodrugs part I: Synthesis." Archiv der Pharmazie 324, no. 10 (2010): 821–25. http://dx.doi.org/10.1002/ardp.2503241009.

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33

Guo, Yong En, Xiao Guang Niu, Cai Ju Zhou, Jie Chu, Wei Wei Xu, and Guo Zhen Fang. "Design and Preparation of 1H-3, 4-Dihydropyrrolo[1,2-a] Pyrazin-1-One via 1H-3,4-Dihydropyrrolo[1,2-C] [1,4] Oxazin-1-One Route." Advanced Materials Research 343-344 (September 2011): 1242–47. http://dx.doi.org/10.4028/www.scientific.net/amr.343-344.1242.

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With 2-pyrrolyltrichloroacetone as major starting material, unreported 1H-3,4-dihydropyrrolo- [1,2-a]pyrazin-1-one was prepared successively by its monoesterification with ethylene glycol, bromine displacement of hydroxy group, cyclization to lactone and its amidation. Unreported 7-aroyl-1H-3,4-dihydropyrrolo[1,2-c][1,4]oxazin-1-one compounds were also synthesized in turn by 2-pyrrolyl-trichloroacetone’s Friedel-Crafts acylation and cyclization. Their structures were characterized by IR, 1H NMR, 13C NMR, MS, HRMS, etc.

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34

El-Ahl, A. A. S. "A NOVEL SYNTHESIS OF 2-SUBSTITUTED-4H-THIENO [2,3-d][1,3] OXAZIN-4-ONE AND 2,3-DISUBSTITUTED THIENO [2,3-d]PYRIMIDIN-4(3H)-ONE DERIVATIVES." Phosphorus, Sulfur, and Silicon and the Related Elements 156, no. 1 (2000): 189–201. http://dx.doi.org/10.1080/10426500008045003.

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35

SCHWENKER, G., and J. CHEN. "ChemInform Abstract: 1,2-Dihydro-3,1-benzoxazin-4-one and 4H-1,2-Dihydropyrido(2,3-d)(1,3)-oxazin-4-one Derivatives as Potential Prodrugs. Part 1. Synthesis." ChemInform 24, no. 25 (2010): no. http://dx.doi.org/10.1002/chin.199325191.

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36

Singh, Raj Bahadur, Krishna Srivastava, Ram Prakash Tiwari, and Jyoti Srivastava. "Synthesis of Novel Oxazin Analogs of Thio-4-azaspiro[4.5]decan-3-one for their Antimicrobial Activity." Asian Journal of Organic & Medicinal Chemistry 6, no. 2 (2021): 116–20. http://dx.doi.org/10.14233/ajomc.2021.ajomc-p323.

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The present work reports the synthesis of 4-(1-(substituted phenyl)-1H-naphtho[1,2-e][1,3]oxazin- 2(3H)-yl)-1-thia-4-azaspiro-[4.5]-decan-3-one IV(a-h) by 4-(((substituted phenyl)(2-hydroxynaphthalen- 1-yl) ethyl)amino)-1-thia-4-azaspiro[4.5]decan-3-one with formaldehyde in acetonitrile, containing a spiro ring obtained from the reaction of cyclohexylidene hydrazine and thioglycollic acid in DMF (cyclohexanone reacts with hydrazine hydrate in pyridine). The structures of the synthesized compounds have been established on the basis of elemental analysis, UV-vis absorption spectroscopy, IR, 1H N

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37

Matsuo, Jun-ichi, Yusuke Shima, Emiko Igarashi, and Tomoyuki Yoshimura. "Reactions of Nitrosobenzenes with Cyclobutanones by Activation with a Lewis Acid." Synlett 29, no. 06 (2017): 723–26. http://dx.doi.org/10.1055/s-0036-1588469.

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Formal [4+2] cycloaddition between 3-ethoxy-2-alkylcyclobutanones and nitrosobenzene proceeded by activation with Me3SiOTf to afford 6-alkyl-2-phenyl-2H-1,2-oxazin-5(6H)-one by regioselective cleavage of the more substituted C2–C3 bond of the cyclobutanone ring. On the other hand, reactions of 3-phenylcyclobutanones and 2-benzyloxycyclobutanone with nitrosobenzene gave γ,δ-unsaturated and cyclic hydroxamic acid derivatives, respectively, by cleavage of a cyclobutanone C1–C2 bond.

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38

Sert, Yusuf, Mehmet Gümüş, Volkan Kamaci, Halil Gökce, İbrahim Kani, and İrfan Koca. "Spectroscopic investigation of 2-(4-benzoyl-1,5-diphenyl-1H-pyrazol-3-yl)-4H-naphto[2,3-d][1,3]oxazin-4-one molecule." Journal of Theoretical and Computational Chemistry 16, no. 05 (2017): 1750039. http://dx.doi.org/10.1142/s0219633617500390.

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In this present study, the experimental and theoretical vibrational frequencies of an important pharmacological molecule 2-(4-benzoyl-1,5-diphenyl-1[Formula: see text]-pyrazol-3-yl)-4[Formula: see text]-naphto[2,3-[Formula: see text]][1,3]oxazin-4-one have been researched. The experimental FT-IR and laser-Raman spectra of the title compound have been taken in the region (4000–400[Formula: see text]cm[Formula: see text]) and (4000–100[Formula: see text]cm[Formula: see text]), respectively. The vibrational modes and optimized structure parameters have been computed by using DFT/B3LYP methods wit

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39

Jain, Nimisha, and Pradeep Kumar Singour. "Novel 3-{4-[2-Amino-4-(Substitutedphenyl)-2H-[1, 3] Oxazin/Thiazin-6-Yl} -2-Phenyl-3H-Quinazolin-4-One Derivatives as Enhancer of GABA Mediated Inhibition: Synthesis, Molecular Modeling and Pharmacological Studies." Letters in Drug Design & Discovery 17, no. 2 (2020): 199–213. http://dx.doi.org/10.2174/1570180816666190222155404.

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Background: According to WHO, the 50 million people worldwide are suffering from epilepsy, making it one of the most common neurological diseases globally. Epilepsy is often characterized by neurobiological, cognitive, psychological and behavioral changes and that may enhance the susceptibility to seizures and affect the quality of life. Objective: The aim of the present work was to develop 2, 3 disubstituted 4-(3H)-quinazolinone derivatives in order to find an effective and highly lipophilic compound with lesser side effects and to evaluate them for anticonvulsant and neurotoxic activity. Met

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40

Ali, AS, JS Wilkie, and KN Winzenberg. "Synthesis of Some Hydrazone Derivatives Structurally Related to the Insecticide Pymetrozine." Australian Journal of Chemistry 49, no. 8 (1996): 927. http://dx.doi.org/10.1071/ch9960927.

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Reaction of pyridine-3-carbaldehyde methylhydrazone with 1,1'-carbonylbis-1H-imidazole afforded (E)-1'-methyl-2'-(3"-pyridyl) methylidene ]-1H-imidazole-1-carbohydrazide (2). Reaction of (2) with ethylamine, ethanol, ethanethiol, hydrazine monohydrate and methoxyamine afforded the corresponding semicarbazide, carbazate, thiocarbazate, carbonohydrazide and 4-methoxysemicarbazide derivatives (3a-d,g). Reaction of (2) with methylhydrazine gave the carbonohydrazide derivative (3f) together with 2,4-dimethyl-6-(3'-pyridyl)-1,4,5,6-tetrahydro-1,2,4,5-tetrazin-3(2H)-one (4a). The preparation of (E)-3

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41

Narsaiah, Banda, Sribhashyam R. Kanth, Dravidum Maitraie, Ghojala V. Reddy, and Pamulaparty S. Rao. "Multistep Synthesis of Pyrido[3’,2’:4,5]pyrrolo[3,2-d][1,3]oxazin-4(5H)-one from 2-Aminonicotinonitriles." HETEROCYCLES 65, no. 6 (2005): 1415. http://dx.doi.org/10.3987/com-05-10334.

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Xie, Yong-Sheng, Bao-Xiang Zhao, Hong-Shui Lv, Ji-Kun Li, Bai-Shan Wang, and Dong-Soo Shin. "Synthesis and single-crystal characterization of novel 2-ferrocenyl-4H-pyrazolo[5,1-c][1,4]oxazin-4-one derivatives." Journal of Molecular Structure 930, no. 1-3 (2009): 83–87. http://dx.doi.org/10.1016/j.molstruc.2009.04.042.

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M. F. Madkour, Hassan, Hassan M. F. Madkour, Mounir A. I. Salem, Taha M. Abdel-Rahman, and Mohamed E. Azab. "Reactions of 5-(p-Anisyl)-2-methyl-7-(p-tolyl)-4H-pyrido[2,3-d][1,3]oxazin-4-one." HETEROCYCLES 38, no. 1 (1994): 57. http://dx.doi.org/10.3987/com-91-5873.

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Alabaster, Ramon J., Andrew W. Gibson, Simon A. Johnson, John S. Edwards, and Ian F. Cottrell. "Synthesis of N-benzyl-3-(S)-(+)-(4-fluorophenyl)-1,4-oxazin-2-one via a crystallisation induced asymmetric transformation." Tetrahedron: Asymmetry 8, no. 3 (1997): 447–50. http://dx.doi.org/10.1016/s0957-4166(96)00531-9.

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Ghabbour, Hazem A. "Crystal structure of 2-phenyl-5,6,7,8-tetrahydro-4H-benzo[4,5]thieno[2,3-d][1,3]oxazin-4-one, C16H13NO2S." Zeitschrift für Kristallographie - New Crystal Structures 231, no. 2 (2016): 623–25. http://dx.doi.org/10.1515/ncrs-2015-0214.

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AbstractC16H13NO2S, P1̅ (no. 2), a = 8.0873(4) Å, b = 12.7820(7) Å, c = 13.5574(7) Å, α = 74.880(2)°, β = 75.421(2)°, γ = 76.391(2)°, V = 1287.61(12) Å3, Z = 4, Rgt(F) = 0.0413, wRref(F2) = 0.1075, T = 100 K.

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Zhang, Chen-Chen, Zhi-Peng Huo, Mei-Lin Tang, Yong-Xi Liang, and Xun Sun. "TMSOTf-mediated approach to 1,3-oxazin-2-one skeleton through one-pot successive reduction-[4 + 2] cyclization process of imides with ynamides." Tetrahedron Letters 68 (March 2021): 152946. http://dx.doi.org/10.1016/j.tetlet.2021.152946.

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Deeb, Ali, Besher Bayoumy, Fathy Yasine, and Rida Fikry. "Pyridazine Derivatives and Related Compounds, Part 4. Pyrrolo[2,3-c]pyridazines and Furo[2,3-c]pyndazines, Synthesis and Some Reactions." Zeitschrift für Naturforschung B 47, no. 3 (1992): 418–23. http://dx.doi.org/10.1515/znb-1992-0320.

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Ethyl 5-amino-3,4-diphenyl-7H-pyrrolo[2,3-c]pyridazine-6-carboxylate (1), ethyl 5-aminofuro[ 2,3-c]pyridazine-6-carboxylate (2) and 5-aminofuro[2,3-c]pyridazine-6-carboxamide (3), are obtained from 4-cyano-5,6-diphenyl-3(2H)-pyridazinone. 5-Acetamido and 5-chloroacetamido derivatives prepared from 1, undergo cyclization on heating to form 2-substituted pyridazino[4',3':4,5]pyrrolo[3,2-d]oxazin-4(5H)-one (5a, b). The reaction of 1 and 2 with hydrazine gave 6-carbohydrazide derivatives (7 a, b). Compound 3 undergoes condensation with acetyl chloride, chloroacetyl chloride, benzoyl chloride, form

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Osarumwense, PO. "Synthesis and Analgesic Activity of 5,6-difluoro-2-Methyl-4H-benzo(d) (1,3)-Oxazin-4-one and 3-Amino-5,6-difluoro-2-Mehtyl-quinzolin 4(3H)-One." American Journal of Biomedical Science & Research 5, no. 2 (2019): 127–30. http://dx.doi.org/10.34297/ajbsr.2019.05.000892.

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Osarumwense, Peter, and Osaro Iyekowa. "Synthesis and Antibacterial Activity of 7-chloro-2–methyl-4H-benzo[d][1,3]–oxazin-4-one and 3–amino-7-chloro-2-methyl quinazolin-4(3H)–one." Tropical Journal of Natural Product Research 1, no. 4 (2017): 173–75. http://dx.doi.org/10.26538/tjnpr/v1i4.7.

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Khavasi, Hamid Reza, Ayoob Bazgir, Vahid Amani, and Rahmatollah Rahimi. "Synthesis and crystal structure of 1,2-dihydro-1-(4-chlorophenyl)naphtho [1,2-e][1,3]oxazin-3-one." Journal of Chemical Research 2008, no. 8 (2008): 450–51. http://dx.doi.org/10.3184/030823408x340825.

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