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Journal articles on the topic 'Oxazol'

Author: Grafiati

Published: 4 June 2021

Last updated: 3 February 2022

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1

Ochędzan-Siodłak, Wioletta, Dawid Siodłak, Karolina Banaś, Katarzyna Halikowska, Sławomir Wierzba, and Karel Doležal. "Naturally Occurring Oxazole Structural Units as Ligands of Vanadium Catalysts for Ethylene-Norbornene (Co)polymerization." Catalysts 11, no. 8 (2021): 923. http://dx.doi.org/10.3390/catal11080923.

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1,3-Oxazole and 4,5-dihydro-1,3-oxazole are common structural motifs in naturally occurring peptides. A series of vanadium complexes were synthesized using VCl3(THF)3 and methyl substituted (4,5-dihydro-1,3-oxazol-2-yl)-1,3-oxazoles as ligands and analyzed using NMR and MS methods. The complexes were found to be active catalysts both in ethylene polymerization and ethylene-norbornene copolymerization. The position of methyl substituent in the ligand has considerable impact on the performance of (co)polymerization reaction, as well as on the microstructure, and thus physical properties of the o

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2

Apostol, Theodora-Venera, Mariana Carmen Chifiriuc, Constantin Draghici, et al. "Synthesis, In Silico and In Vitro Evaluation of Antimicrobial and Toxicity Features of New 4-[(4-Chlorophenyl)sulfonyl]benzoic Acid Derivatives." Molecules 26, no. 16 (2021): 5107. http://dx.doi.org/10.3390/molecules26165107.

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The multi-step synthesis, physico-chemical characterization, and biological activity of novel valine-derived compounds, i.e., N-acyl-α-amino acids, 1,3-oxazol-5(4H)-ones, N-acyl-α-amino ketones, and 1,3-oxazoles derivatives, bearing a 4-[(4-chlorophenyl)sulfonyl]phenyl moiety are reported here. The structures of the newly synthesized compounds were confirmed by spectral (UV-Vis, FT-IR, MS, 1H- and 13C-NMR) data and elemental analysis results, and their purity was determined by RP-HPLC. The new compounds were assessed for their antimicrobial activity and toxicity to aquatic crustacean Daphnia m

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3

Rosca, Elena Valentina, Theodora Venera Apostol, Constantin Draghici, et al. "Synthesis, characterization and Cytotoxicity Evaluation of New Compounds from Oxazol-5(4H)-Ones and 1,2,4-Triazin-6(5H)-Ones Classes." Revista de Chimie 70, no. 11 (2019): 3769–74. http://dx.doi.org/10.37358/rc.19.11.7644.

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This paper presents the synthesis of new heterocyclic compounds from oxazoles and triazinones classes. Some 2-(4-(4-X-phenylsulfonyl)benzamido)acetic acids were condensed with 4-iodobenzaldehyde in presence of acetic anhydride and sodium acetate, when the new corresponding unsaturated oxazol-5(4H)-one were obtained. Through the reaction of these oxazol-5(4H)-ones with phenylhydrazine, in presence of the acetic acid and sodium acetate, the new heterocyclic compounds from 1,2,4-triazin-6(5H)-ones class were obtained. The structures of synthesized compounds have been confirmed by spectral methods

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4

Rosca, Elena Valentina, Theodora Venera Apostol, Constantin Draghici, et al. "Synthesis, characterization and Cytotoxicity Evaluation of New Compounds from Oxazol-5(4H)-Ones and 1,2,4-Triazin-6(5H)-Ones Classes." Revista de Chimie 70, no. 11 (2019): 3769–74. http://dx.doi.org/10.37358/rc.70.19.11.7644.

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This paper presents the synthesis of new heterocyclic compounds from oxazoles and triazinones classes. Some 2-(4-(4-X-phenylsulfonyl)benzamido)acetic acids were condensed with 4-iodobenzaldehyde in presence of acetic anhydride and sodium acetate, when the new corresponding unsaturated oxazol-5(4H)-one were obtained. Through the reaction of these oxazol-5(4H)-ones with phenylhydrazine, in presence of the acetic acid and sodium acetate, the new heterocyclic compounds from 1,2,4-triazin-6(5H)-ones class were obtained. The structures of synthesized compounds have been confirmed by spectral methods

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5

Zreigh, Mohamed M., Harry Adams, Richard F. W. Jackson, and Craig C. Robertson. "The first crystal structure of the pyrrolo[1,2-c]oxazole ring system." Acta Crystallographica Section E Crystallographic Communications 75, no. 9 (2019): 1336–38. http://dx.doi.org/10.1107/s2056989019011095.

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The title compound, C7H4F3NO2, 3-trifluoromethyl-1H-pyrrolo[1,2-c]oxazol-1-one, is the first crystal structure of the pyrrolo[1,2-c]oxazole ring system: the fused ring system is almost planar (r.m.s. deviation = 0.006 Å). In the crystal, weak C—H...O and C—H...F hydrogen bonds link the molecules into [001] chains and π–π stacking interactions consolidate the structure.

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6

Aly, Ashraf A., Alaa A. Hassan, Nasr K. Mohamed, et al. "Synthesis of New Fused Heterocyclic 2-Quinolones and 3-Alkanonyl-4-Hydroxy-2-Quinolones." Molecules 24, no. 20 (2019): 3782. http://dx.doi.org/10.3390/molecules24203782.

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Herein, we report the synthesis of 5,12-dihydropyrazino[2,3-c:5,6-c′]difuro[2,3-c:4,5-c′]-diquinoline-6,14(5H,12H)diones, 2-(4-hydroxy-2-oxo-1,2-dihydroquinolin-3-yl)-1,4-diphenyl- butane-1,4-diones and 4-(benzo-[d]oxazol-2-yl)-3-hydroxy-1H-[4,5]oxazolo[3,2-a]pyridine-1-one. The new candidates were synthesized and identified by different spectroscopic techniques, and X-ray crystallography.

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7

Phalke, Pallavi L. "Synthesis of different α, β- unsaturated oxazolone derivatives". Journal of Drug Delivery and Therapeutics 9, № 1 (2019): 124–27. http://dx.doi.org/10.22270/jddt.v9i1.2189.

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Acetyl glycine were prepared from glycine acetic anhydride and then 2, 4-disubstituted Oxazol-5-one were prepared from acetyl glycine, substituted aldehydes, acetic anhydride, and sodium acetate as a catalyst. The formed product is evaluated and characterized by thin layer chromatography, infrared spectroscopy and melting point. The, β- unsaturated shows ability to react with various nucleophilic reagents for synthesis of new fused oxazole compounds. Keywords: glycine, acetic anhydride, aldehyde Sodium acetate, Oxazolone, E. coli, Antibacterial Activity.

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8

Ochędzan-Siodłak, Wioletta, Dawid Siodłak, Aleksandra Piontek, and Karel Doležal. "Titanium and Vanadium Catalysts with 2-Hydroxyphenyloxazoline and Oxazine Ligands for Ethylene-Norbornene (co)Polymerization." Catalysts 9, no. 12 (2019): 1041. http://dx.doi.org/10.3390/catal9121041.

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A series of titanium and vanadium complexes with oxazoline 2-(4,5-dihydro-1,3-oxazol-2-yl)phenol (L1), 2-(4-methyl-4,5-dihydro-1,3-oxazol-2-yl)phenol (L2), and oxazine 2-(5,6-dihydro-4H-1,3-oxazin-2-yl)phenol (L3) ligands were synthesized, and their structures were determined by NMR and MS methods as (L)2MtCl2. The vanadium complexes were found to be highly active in ethylene (7300 kgPE/(molV·h)) and ethylene/norbornene (5300 kgCop/(molV·h)) (co)polymerization. The polyethylene characteristics were melting temperature (123–142 °C), crystallinity degree (49–75%), molecular weight (5.7–8.5 × 105

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9

da Silva Filho, Antonio João, Lucinêz da Cruz Dantas, and Otávio Luís de Santana. "Diradicalar Character and Ring Stability of Mesoionic Heterocyclic Oxazoles and Thiazoles by Ab Initio Mono and Multi-Reference Methods." Molecules 25, no. 19 (2020): 4524. http://dx.doi.org/10.3390/molecules25194524.

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Mesoionics are neutral compounds that cannot be represented by a fully covalent or purely ionic structure. Among the possible mesomeric structures of these compounds are the diradical electronic configurations. Theoretical and experimental studies indicate that some mesoionic rings are unstable, which may be related to a significant diradical character, that until then is not quantified. In this work, we investigated the diradical character of four heterocycles: 1,3-oxazol-5-one, 1,3-oxazol-5-thione, 1,3-thiazole-5-one, and 1,3-thiazole-5-thione. The oxazoles are known to be significatively le

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10

Gelmi, M. Luisa, Donate Pocar, Monica Viziano, Riccardo Destro, and Felicita Merati. "Oxazol-5(4H)-ones. Part 7. New synthesis of oxazolo[5,4-b]pyridines." Journal of the Chemical Society, Perkin Transactions 1, no. 6 (1992): 701. http://dx.doi.org/10.1039/p19920000701.

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11

Apostol, Theodora Venera, Stefania Felicia Barbuceanu, Laura Ileana Socea, et al. "Synthesis, characterization and Cytotoxicity Evaluation of New Heterocyclic Compounds with Oxazole Ring Containing 4-(Phenylsulfonyl)phenyl Moiety." Revista de Chimie 70, no. 11 (2019): 3793–801. http://dx.doi.org/10.37358/rc.19.11.7649.

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The paper presents the synthesis, characterization and cytotoxicity assessment of five organic compounds containing 4-(phenylsulfonyl)phenyl fragment in the molecule, namely of three acyclic precursors derived from phenylalanine (from N-acyl-a-amino acids, N-acyl-a-amino acyl chlorides and N-acyl-a-amino ketones class) and of the cyclization products: a 1,3-oxazol-5(4H)-one and, respectively, a 1,3-oxazole substituted in position 5 with the p-tolyl group. The synthesized compounds were characterized by spectral methods (UV-Vis, FT-IR, 1H-NMR, 13C-NMR, and MS) and elemental analysis, which conf

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12

Apostol, Theodora Venera, Stefania Felicia Barbuceanu, Laura Ileana Socea, et al. "Synthesis, characterization and Cytotoxicity Evaluation of New Heterocyclic Compounds with Oxazole Ring Containing 4-(Phenylsulfonyl)phenyl Moiety." Revista de Chimie 70, no. 11 (2019): 3793–801. http://dx.doi.org/10.37358/rc.70.19.11.7649.

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The paper presents the synthesis, characterization and cytotoxicity assessment of five organic compounds containing 4-(phenylsulfonyl)phenyl fragment in the molecule, namely of three acyclic precursors derived from phenylalanine (from N-acyl-a-amino acids, N-acyl-a-amino acyl chlorides and N-acyl-a-amino ketones class) and of the cyclization products: a 1,3-oxazol-5(4H)-one and, respectively, a 1,3-oxazole substituted in position 5 with the p-tolyl group. The synthesized compounds were characterized by spectral methods (UV-Vis, FT-IR, 1H-NMR, 13C-NMR, and MS) and elemental analysis, which conf

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13

Wolińska, Ewa. "Chiral oxazoline ligands with two different six-membered azaheteroaromatic rings – synthesis and application in the Cu-catalyzed nitroaldol reaction." Heterocyclic Communications 22, no. 2 (2016): 85–94. http://dx.doi.org/10.1515/hc-2016-0001.

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AbstractSynthesis and catalytic activity of chiral ligands 5,6-diphenyl-3-{3-[(4S/R)-4-R/Ar-4,5-dihydro-1,3-oxazol-2-yl]pyridin-2-yl}amino-1,2,4-triazines 2 and their analogs 3 possessing an N-oxide function in the pyridine ring are described. The pivotal step in the synthesis of ligands 2 is the Buchwald-Hartwig Pd-catalyzed cross-coupling reaction between 3-bromo-5,6-diphenyl-1,2,4-triazine (7a) and enantiopure 3-(4,5-dihydro-1,3-oxazol-2-yl)pyridin-2-amines 6a–d. Aromatic nucleophilic substitution of chlorine in 3-chloro-5,6-diphenyl-1,2,4-triazine (7b) with 3-(4,5-dihydro-1,3-oxazol-2-yl)p

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14

Argade, N. D., B. K. Kalrale, and C. H. Gill. "Microwave Assisted Improved Method for the Synthesis of Pyrazole Containing 2,4,-Disubstituted Oxazole-5-one and their Antimicrobial Activity." E-Journal of Chemistry 5, no. 1 (2008): 120–29. http://dx.doi.org/10.1155/2008/265131.

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Disubstituted oxazol-5-one and pyrazoles are known to exhibit various biological activities. Therefore, in this work, we designed pyrazole containing 2,4-disubstituted oxazol-5-one(3a-g)as a new class of antimicrobial agents. Synthesis of titled compounds was carried out by two different methods. In the first method (conventional Method A), disubstituted oxazol-5-one(3a-g)was prepared by reacting 1-phenyl-3-p-tolyl-1H-pyrazole-4-carbaldehyde(1a-g)with hippuric acid(2)and sodium acetate, in an acetic anhydride for 2.5 - 4 h. In the second method (Method B), the above reaction was carried out un

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15

Bödeker, Jürgen, and Karin Burmester. "Acylierung von 2-Amino-oxazol." Zeitschrift für Chemie 27, no. 7 (2010): 258–59. http://dx.doi.org/10.1002/zfch.19870270706.

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16

Zhao, Hong-Wu, Juan Du, Jia-Ming Guo, et al. "Formal [5+2] cycloaddition of vinylethylene carbonates to oxazol-5-(4H)-ones for the synthesis of 3,4-dihydrooxepin-2(7H)-ones." Chemical Communications 54, no. 66 (2018): 9178–81. http://dx.doi.org/10.1039/c8cc04584d.

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17

Ilyashenko, Rodion, Michał Wera, Jerzy Błażejowski, and Andrey Doroshenko. "5-(4-Fluorophenyl)-2-[2-(5-phenyl-1,3-oxazol-2-yl)phenyl]-1,3-oxazole." Acta Crystallographica Section E Structure Reports Online 66, no. 9 (2010): o2379—o2380. http://dx.doi.org/10.1107/s1600536810031235.

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18

Wolińska, Ewa, Waldemar Wysocki, Danuta Branowska, and Zbigniew Karczmarzyk. "Synthesis and structures of three new pyridine-containing oxazoline ligands of complexes for asymmetric catalysis." Acta Crystallographica Section C Structural Chemistry 77, no. 9 (2021): 529–36. http://dx.doi.org/10.1107/s2053229621008202.

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Three new chiral pyridine-containing oxazoline derivatives with fluorine and perfluoromethyl groups, namely, 2-({2-[(4S)-4-phenyl-4,5-dihydro-1,3-oxazol-2-yl]phenyl}amino)-5-(trifluoromethyl)pyridine, C21H16F3N3O, 2-({5-fluoro-2-[(4S)-4-isopropyl-4,5-dihydro-1,3-oxazol-2-yl]phenyl}amino)-5-(trifluoromethyl)pyridine, C18H17F4N3O, and 2-({2-[(3aR,8aS)-8,8a-dihydro-3aH-indeno[1,2-d]oxazol-2-yl]phenyl}amino)-5-(trifluoromethyl)pyridine, C22H16F3N3O, as chiral ligands in metal-catalysed asymmetric reactions, were synthesized and characterized by spectral and X-ray diffraction methods. The conformat

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19

Song, Lina, Xianhai Tian, Chunyu Han, Mehran Amanpur, Frank Rominger, and A. Stephen K. Hashmi. "Catalyst-free synthesis of oxazol-2(3H)-ones from sulfilimines and diazo compounds through a tandem rearrangement/aziridination/ring-expansion reaction." Organic Chemistry Frontiers 8, no. 13 (2021): 3314–19. http://dx.doi.org/10.1039/d1qo00473e.

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20

Goldfogel, Matthew J., and Simon J. Meek. "Diastereoselective synthesis of vicinal tertiary and N-substituted quaternary stereogenic centers by catalytic hydroalkylation of dienes." Chemical Science 7, no. 7 (2016): 4079–84. http://dx.doi.org/10.1039/c5sc04908c.

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21

Subbulakshmi, Karanth N., Badiadka Narayana, Hemmige S. Yathirajan, et al. "Dihydrooxazolones and dihydroimidazolones derived from acylglycines: syntheses, molecular structures and supramolecular assembly." Acta Crystallographica Section C Structural Chemistry 71, no. 8 (2015): 742–51. http://dx.doi.org/10.1107/s2053229615013637.

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Syntheses and structures are described for some alkylidene-substituted dihydrooxazolones and dihydroimidazoles derived from simple acylglycines. A second, triclinic, polymorph of 4-benzylidene-2-(4-methylphenyl)-1,3-oxazol-5(4H)-one, C17H13NO2, (I), has been identified and the structure of 2-methyl-4-[(thiophen-2-yl)methylidene]-1,3-oxazol-5(4H)-one, C9H7NO2S, (II), has been rerefined taking into account the orientational disorder of the thienyl group in each of the two independent molecules. The reactions of phenylhydrazine with 2-phenyl-4-[(thiophen-2-yl)methylidene]-1,3-oxazol-5(4H)-one or

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22

Vlachou, Evangelia-Eirini, Thomas Balalas, Dimitra Hadjipavlou-Litina, and Konstantinos Litinas. "4-Amino-2-(p-tolyl)-7H-chromeno[5,6-d]oxazol-7-one." Molbank 2021, no. 2 (2021): M1237. http://dx.doi.org/10.3390/m1237.

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The new 4-amino-2-(p-tolyl)-7H-chromeno[5,6-d]oxazol-7-one was successfully prepared through the Au/TiO2-catalyzed NaBH4 activation and chemoselective reduction of the new 4-nitro-2-(p-tolyl)-7H-chromeno[5,6-d]oxazol-7-one. The latter was synthesized by the one-pot tandem reactions of 6-hydroxy-5,7-dinitrocoumarin with p-tolylmethanol under Au/TiO2 catalysis. The dinitrocoumarin was obtained by the nitration of 6-hydroxycoumarin with cerium ammonium nitrate (CAN). The structure of the synthesized compounds was confirmed by FT-IR, HR-MS, 1H-NMR and 13C-NMR analysis. Preliminary biological tests

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23

Jian, Fang-Fang, Wei Yi, Li-Ming Wang, and Jing Wang. "5-Methyl-2-[(E)-2-(5-methylbenz[d]oxazol-2-yl)vinyl]benz[d]oxazole." Acta Crystallographica Section E Structure Reports Online 63, no. 9 (2007): o3887. http://dx.doi.org/10.1107/s1600536807035362.

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24

GELMI, M. L., D. POCAR, M. VIZIANO, R. DESTRO, and F. MERATI. "ChemInform Abstract: Oxazol-5(4H)-ones. Part 7. New Synthesis of Oxazolo(5,4-b)pyridines." ChemInform 23, no. 29 (2010): no. http://dx.doi.org/10.1002/chin.199229181.

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25

Song, Hao, Na Cheng, Li-Qin She, Yi Wu, and Wei-Wei Liao. "Efficient synthesis of spirooxindolyl oxazol-2(5H)-ones via palladium(ii)-catalyzed addition of arylboronic acids to nitriles." RSC Advances 9, no. 50 (2019): 29424–28. http://dx.doi.org/10.1039/c9ra07216k.

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26

Zivkovic, Kristina, Lilia M. Baldauf, Jessica L. Cryder, et al. "Chiral tridentate bis(oxazol-2-ylimino) isoindoline-based pincer ligands: isolation and characterization via deligation from in situ prepared Cd-ligand complexes." Dalton Transactions 50, no. 29 (2021): 10041–49. http://dx.doi.org/10.1039/d0dt02531c.

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27

Apostol, Theodora-Venera, Luminita Gabriela Marutescu, Constantin Draghici та ін. "Synthesis and Biological Evaluation of New N-Acyl-α-amino Ketones and 1,3-Oxazoles Derivatives". Molecules 26, № 16 (2021): 5019. http://dx.doi.org/10.3390/molecules26165019.

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In order to develop novel bioactive substances with potent activities, some new valine-derived compounds incorporating a 4-(phenylsulfonyl)phenyl fragment, namely, acyclic precursors from N-acyl-α-amino acids and N-acyl-α-amino ketones classes, and heterocycles from the large family of 1,3-oxazole-based compounds, were synthesized. The structures of the new compounds were established using elemental analysis and spectral (UV-Vis, FT-IR, MS, NMR) data, and their purity was checked by reversed-phase HPLC. The newly synthesized compounds were evaluated for their antimicrobial and antibiofilm acti

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28

Fu, Zheng, Hong Wei, Chao Yuan, and Zhong Wen Li. "Polymerization and Chiroptical Behavior of Polymethacrylamides Bearing a Bulky Oxazoline Pendant." Advanced Materials Research 887-888 (February 2014): 688–92. http://dx.doi.org/10.4028/www.scientific.net/amr.887-888.688.

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The radical polymerization of optically active methacrylamide derivatives, N-[o-(4-phenyl-4,5-dihydro-1,3-oxazol-2-yl) phenymethacrylamide ((R)-PhOPMAM) and N-[o-(4-isopropyl-4,5-dihydro-1,3-oxazol-2-yl) phenymethacrylamide ((S)-PriOPMAM), were carried out under various conditions. The effect of the Lewis acid, that is, rare earth metal trifluoromethanesulfonates on the free-radical polymerization were examined under different solvents. The Lewis acids are effective in enhancing the isotacticity in the polymerization of (S)-PriOPMAM. The same phenomenon were not happened in the polymerization

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29

Kong, Lingbing, Rakesh Ganguly, Yongxin Li, and Rei Kinjo. "Diverse reactivity of a tricoordinate organoboron L2PhB: (L = oxazol-2-ylidene) towards alkali metal, group 9 metal, and coinage metal precursors." Chemical Science 6, no. 5 (2015): 2893–902. http://dx.doi.org/10.1039/c5sc00404g.

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30

Mukku, Narasimharao, and Barnali Maiti. "On water catalyst-free synthesis of benzo[d]imidazo[2,1-b] thiazoles and novel N-alkylated 2-aminobenzo[d]oxazoles under microwave irradiation." RSC Advances 10, no. 2 (2020): 770–78. http://dx.doi.org/10.1039/c9ra08929b.

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31

Harn, Nancy K., Christine J. Gramer, and Benjamin A. Anderson. "Acylation of oxazoles by the copper-mediated reaction of oxazol-2-ylzinc chloride derivatives." Tetrahedron Letters 36, no. 52 (1995): 9453–56. http://dx.doi.org/10.1016/0040-4039(95)02051-9.

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32

Wang, Ziyang, Anqi Huang, Fang Fang, Pengfei Li, Guokai Liu, and Wenjun Li. "Non-hydrogen bond catalyst-mediated diastereoselective conjugate additions of 5H-oxazol-4-ones to o-hydroxyphenyl-substituted p-quinone methides." Organic & Biomolecular Chemistry 18, no. 35 (2020): 6807–11. http://dx.doi.org/10.1039/d0ob01558j.

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An efficient DBU-catalyzed conjugate addition of 5H-oxazol-4-ones to o-hydroxyphenyl-substituted p-quinone methides has been developed, affording the valuable diarylmethanes in high yields with excellent diastereoselectivity.

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33

Zhang, Jing, Man Liu, Chao Li, Yan-Jun Xu, and Lin Dong. "Synthesis of 2,3,4-trisubstituted pyrrole derivatives via [3 + 2] cyclization of activated methylene isocyanides with 4-(arylidene)-2-substituted oxazol-5(4H)-ones." Organic Chemistry Frontiers 7, no. 2 (2020): 420–24. http://dx.doi.org/10.1039/c9qo01044k.

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An efficient base-catalyzed [3 + 2] cyclization between isocyanides and 4-(arylidene)-2-substituted oxazol-5(4H)-ones has been successfully developed to form 2,3,4-trisubstituted and 2,2,3,4-tetrasubstituted pyrrole derivatives.

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34

Fekete, M., C. Gibard, G. J. Dear, et al. "Utilisation of water soluble iridium catalysts for signal amplification by reversible exchange." Dalton Transactions 44, no. 17 (2015): 7870–80. http://dx.doi.org/10.1039/c5dt00311c.

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The catalytic hyperpolarisation of pyridine, 3-hydroxypyridine and oxazol by the Signal Amplification By Reversible Exchange (SABRE) process is achieved by a series of water soluble iridium phosphine and N-heterocyclic carbene dihydride complexes.

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35

Kumar, Vipan, Amandeep Singh, Harleen Kaur, Palak Sharma та Amit Anand. "β-Lactam-Synthon-Interceded Metal/Acid-Free Diastereoselective Access to Highly Functionalized Oxazol-5-ones and Dihydroimidazoles". Synlett 28, № 19 (2017): 2642–46. http://dx.doi.org/10.1055/s-0036-1588531.

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Facile diastereoselective access to functionalized oxazol-5-ones and dihydroimidazoles was accomplished through base-promoted intramolecular amidolysis and methoxide-assisted tandem intramolecular amidolysis/ring opening/intramolecular cyclization, respectively, of C-3-functionalized azetidin-2-ones.

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36

Li, Luyao, Bo Zhu, Huihui Fan, Zhiyong Jiang, and Junbiao Chang. "Direct organocatalytic asymmetric Michael reaction of fluorine hemiaminal-type nucleophile to 4-nitro-5-styrylisoxazoles." Organic Chemistry Frontiers 7, no. 11 (2020): 1343–48. http://dx.doi.org/10.1039/d0qo00348d.

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Herein, we report a chiral bifunctional thiourea catalyzed asymmetric Michael addition reaction between 2-(trifluoromethyl)oxazol-5(2H)-one as a direct C-2-position nucleophile to 4-nitro-5-styrylisoxazoles for the first time.

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37

Indrasena Reddy, K., C. Aruna, K. Sudhakar Babu, et al. "General and efficient synthesis of benzoxazol-2(3H)-ones: evolution of their anti-cancer and anti-mycobacterial activities." RSC Adv. 4, no. 103 (2014): 59594–602. http://dx.doi.org/10.1039/c4ra07123a.

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A novel class of benzo[d]oxazol-2(3H)-one derivatives has been synthesized and their in vitro cytotoxicity against human pancreatic adenocarcinoma and human non-small cell lung carcinoma cancer cell lines was evaluated.

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38

Görgen née Boersch, Christina, Kiril Lutsenko, Eugen Merkul, Walter Frank, and Thomas J. J. Müller. "Catalytic one-pot synthesis of 4-(hetero)aryl substituted 5-(2-oxoethyl) oxazol-2(3H)-ones by coupling–isomerization–elimination (CIE) sequence." Organic Chemistry Frontiers 3, no. 7 (2016): 887–96. http://dx.doi.org/10.1039/c6qo00138f.

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4-(Hetero)aryl substituted 5-(2-oxoethyl) oxazol-2(3H)-ones are readily prepared in a one-pot fashion by a coupling–isomerization–elimination (CIE) sequence fromN-Boc protected 1-aryl propargyl carbamates and acid chlorides.

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39

Rybakov, Victor B., Vadim L. Alifanov, and Eugene V. Babaev. "5-(4-Bromophenyl)-1,3-oxazol-2-amine." Acta Crystallographica Section E Structure Reports Online 62, no. 10 (2006): o4746—o4747. http://dx.doi.org/10.1107/s1600536806038918.

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40

Lindsay, Karl B., and Stephen G. Pyne. "Asymmetric Synthesis of ( - )-Swainsonine." Australian Journal of Chemistry 57, no. 7 (2004): 669. http://dx.doi.org/10.1071/ch04009.

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This paper describes a new synthesis of (–)-swainsonine via the ring-closing metathesis reaction of a substituted 3-allyl-4-vinyloxazolindin-2-one and subsequent diastereoselective syn-dihydroxylation of the resulting pyrrolo- [1,2-c]oxazol-3-one.

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41

Zhu, Bo, Tianxiao Yang, Yingxin Gu, Shuping Zhu, Gongming Zhu, and Junbiao Chang. "Enantioselective organocatalytic amination of 2-perfluoroalkyl-oxazol-5(2H)-ones towards the synthesis of chiral N,O-aminals with perfluoroalkyl and amino groups." Organic Chemistry Frontiers 8, no. 15 (2021): 4160–65. http://dx.doi.org/10.1039/d1qo00569c.

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The first highly enantioselective amination at the C-2 position of oxazol-5(2H)-ones has been presented. Two efficient relay asymmetric transformation processes were successfully utilized to synthesize chiral N,O-aminals with a quaternary center.

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42

Tien Nguyen, Cong, Dao Thi Hong Dinh, Thin Van Nguyen, Giang Duc Le, and Hien Cao Nguyen. "Synthesis and Antimicrobial Activity of Some 1-arylideneamino-4-(4-chlorobenzylidene)-2-methyl- 1H-imidazolin-5(4H)-one Compounds." Oriental Journal of Chemistry 35, no. 2 (2019): 822–28. http://dx.doi.org/10.13005/ojc/350245.

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4-Chlorobenzylidene-2-methyl-(4H)-oxazol-5-one, which were prepared from 4-chlorobenzaldehyde and acetylglycine in reaction with hydrazine hydrate in ethanol gave 1-amino-4-(4-chlorobenzylidene)-2-methyl-1H-imidazolin-5(4H)-one. However, treatment of 4-chlorobenzylidene-2-methyl-(4H)-oxazol-5-one with hydrazine hydrate in pyridine yielded 3-(4-chlorophenyl)propanohydrazide. Reaction of 1-amino-4-(4-chlorobenzylidene)-2-methyl-1H-imidazolin-5(4H)-one with aromatic aldehydes gave eight corresponding Schiff’s bases namely 1-arylideneamino-4-(4-chlorobenzylidene)-2-methyl-1H-imidazolin-5(4H)-ones.

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43

Lukashuk, O. I., E. R. Abdurakhmanova, K. M. Kondratyuk, et al. "Introduction of chiral 2-(aminoalkyl) substituents into 5-amino-1,3-oxazol-4-ylphosphonic acid derivatives and their use in phosphonodipeptide synthesis." RSC Advances 5, no. 15 (2015): 11198–206. http://dx.doi.org/10.1039/c4ra13819h.

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Starting from phthalimidoalkanoylamines 1 we have suggested a synthetic route to 5-amino-1,3-oxazol-4-ylphosphonic acid derivatives 5 , which have been further used to obtain phosphonodipeptides 8, 9, and 10 with the original optical purity retained.

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44

Mai, A., M. Artico, S. Massa, et al. "Methyl-2-Thienylketopolymethyleneoxyphenyl Derivatives of Alkyl-Substituted 4,5-Dihydro-Oxazoles with Anti-Human Picornavirus Activity." Antiviral Chemistry and Chemotherapy 7, no. 4 (1996): 213–20. http://dx.doi.org/10.1177/095632029600700407.

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The synthesis of 5-methyl-2-thienylketopolymethylene oxyphenyl 4,5-dihydro-2-(alkyl)oxazoles was accomplished by the assembly of two synthones, namely 1-(5-methyl-2-thienyl)-7-hydroxy-1-heptanone (or 1-(5-methyl-2-thienyl)-5-chloro-1-pentanone) and 4-[4,5-dihydro(alkyl)oxazol-2-yl]phenol, in the presence of diethyl azodicarboxylate(DEAD)-triphenyl phosphine (or sodium iodide and anhydrous potassium carbonate). Eighteen new disoxaril analogues were synthesized by the above procedure and tested in vitro against several rhino and enteroviruses. With a few exceptions, all test derivatives were mor

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45

Bors, István, József Kaizer, Gábor Speier, and Michel Giorgi. "Carbon dioxide as a primary oxidant and a C1 building block." RSC Adv. 4, no. 86 (2014): 45969–72. http://dx.doi.org/10.1039/c4ra06462c.

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2,3-Dihydro-2,2,2-triphenylphenanthro[9,10-d]-1,3,2-λ<sup>5</sup>-oxazaphospholes react with carbon dioxide in an overall second order reaction at room temperature to give 3H-phenanthro[9,10-d]oxazol-2-ones and triphenylphosphine oxide in good yields.

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46

Iqbal, Asma, Humaira Masood Siddiqi, Maria Zubair, Toheed Akhter, O. Ok Park, and Aamer Saeed. "Investigation of thermal and fluorescent properties of benzoxazole-linked triphenylamine-based co-polyimides." High Performance Polymers 32, no. 3 (2019): 231–41. http://dx.doi.org/10.1177/0954008319853332.

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A series of novel fluorescent co-polyimides are obtained by combining N 1-(4-aminophenyl)- N 1-(4-(benzo[ d]oxazol-2-yl) phenyl) benzene-1,4-diamine and 4,4′-oxydianiline with four aromatic anhydride, 3,3′,4,4′-benzophenonetetracarboxylic dianhydride, pyromellitic dianhydride, 4,4′-oxydiphthalic anhydride, and 4,4 ′-(hexafluoroisopropylidene)diphthalic anhydride following conventional polycondensation method. The resultant co-polyimides are characterized by elemental, Fourier transform infrared spectral analysis and gel permeation chromatography. All newly prepared polyimides (PIs) exhibit sha

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47

Asiri, Abdullah M., Osman I. Osman, Saad H. Al-Thaqafy та Salman A. Khan. "Optical properties and fluorescence quenching of carbazole containing (D–π–A) push–pull chromophores by silver nanoparticles: a detailed insight via an experimental and theoretical approach". RSC Advances 7, № 14 (2017): 8402–14. http://dx.doi.org/10.1039/c6ra25741k.

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(4Z)-4-[(9-Ethyl-9H-carbazol-3-yl)methylidene]-2-phenyl-1,3-oxazol-5(4H)-one (ECPO) was prepared by the one-pot multi-component reaction of 9-ethyl-9H-carbazole-3-carbaldehyde, hippuric acid, anhydrous sodium acetate and acetic anhydride under microwave irradiation.

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48

Hussein, Modather F. "New sulfonamide hybrids: synthesis, in vitro antimicrobial activity and docking study of some novel sulfonamide derivatives bearing carbamate/acyl-thiourea scaffolds." Mediterranean Journal of Chemistry 7, no. 5 (2018): 370–85. http://dx.doi.org/10.13171/mjc751912111445mh.

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In this study, the novel hybrids sulfonamide carbamates were synthesized by treatment of N-substituted 4-isothiocyanatophenyl sulfonamides with ethyl carbamate in dry 1,4-dioxane at reflux temperature in the presence of triethylamine. Also, treatment of Phenylacetylisothiocyanate with sulfanilamide in refluxing acetonitrile afforded the corresponding hybrid sulfonamide acylthiourea derivatives. The anti-microbial activities of the synthesized compounds were evaluated. Ethyl ({4-[(5-methyl-1,2-oxazol-3-yl)sulfamoyl)-phenyl]carbamothioyl)- carbamate and 2-Phenyl-N-((4-(N-thiazol-2-yl)sulfamoyl)-

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49

Fisk, Jason S., Robert A. Mosey, and Jetze J. Tepe. "The diverse chemistry of oxazol-5-(4H)-ones." Chemical Society Reviews 36, no. 9 (2007): 1432. http://dx.doi.org/10.1039/b511113g.

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50

Machado, Pablo, Fernanda A. Rosa, Rubia M. S. da Silva, Robert A. Burrow, and Marcos A. P. Martins. "2-(4,5-Dihydro-1,3-oxazol-2-yl)quinoline." Acta Crystallographica Section E Structure Reports Online 64, no. 1 (2007): o154. http://dx.doi.org/10.1107/s1600536807045023.

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