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Journal articles on the topic 'Benzoxazole'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Özil, Musa, and Emre Menteşe. "Microwave-assisted Synthesis of Benzoxazoles Derivatives." Current Microwave Chemistry 7, no. 3 (2020): 183–95. http://dx.doi.org/10.2174/2213335607999200518094114.

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Background: Benzoxazole, containing a 1,3-oxazole system fused with a benzene ring, has a profound effect on medicinal chemistry research owing to its important pharmacological activities. On the other hand, the benzoxazole derivative has exhibited important properties in material science. Especially in recent years, microwave-assisted synthesis is a technique that can be used to increase diversity and quick research in modern chemistry. The utilization of microwave irradiation is beneficial for the synthesis of benzoxazole in recent years. In this focused review, we provide a metaanalysis of

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2

Syetov, Y. "Computational study of nonlinear optical properties of benzoxazoles exhibiting excited state proton transfer." Journal of Physics and Electronics 27, no. 1 (2019): 47–50. http://dx.doi.org/10.15421/331908.

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Hyperpolarizability of molecules of 2-(2'-hydroxyphenyl)benzoxazole and 2,5-bis(2-benzoxazolyl)phenol is calculated by density functional theory quadratic response method for static electric field and hyper-Rayleigh scattering at 532 nm. It is found that 2,5-bis(2-benzoxazolyl)phenol demonstrates the hyperpolarizability about ten times larger than 2-(2'-hydroxyphenyl)benzoxazole. Dominant component of the hyperpolarizability tensor corresponds to the long axis of the molecule.

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3

Zou, Yue, Yong Zhang, Xing Liu, et al. "Research Progress of Benzothiazole and Benzoxazole Derivatives in the Discovery of Agricultural Chemicals." International Journal of Molecular Sciences 24, no. 13 (2023): 10807. http://dx.doi.org/10.3390/ijms241310807.

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Benzoxazole and benzothiazole have a broad spectrum of agricultural biological activities, such as antibacterial, antiviral, and herbicidal activities, which are important fused heterocyclic scaffold structures in agrochemical discovery. In recent years, great progress has been made in the research of benzoxazoles and benzothiazoles, especially in the development of herbicides and insecticides. With the widespread use of benzoxazoles and benzothiazoles, there may be more new products containing benzoxazoles and benzothiazoles in the future. We systematically reviewed the application of benzoxa

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4

Syetov, Y. "Theoretical modeling of two-photon absorption of benzoxazoles exhibiting excited state proton transfer." Journal of Physics and Electronics 26, no. 2 (2018): 55–58. http://dx.doi.org/10.15421/331824.

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Two-photon absorption spectra of 2-(2'-hydroxyphenyl)benzoxazole, 2,5-bis(2-benzoxazolyl)phenol and 2,5-bis(2-benzoxazolyl)hydroquinone are modeled by time-dependent density functional theory calculations. In contrast to the linear absorption, where the transitions to the two lowest excited states are leading, the two-photon absorption cross sections are significant for the transitions to higher states which are weak in one-photon absorption spectra. The 2,5-bis(2-benzoxazolyl)phenol and 2,5-bis(2-benzoxazolyl)hydroquinone demonstrate the maximum cross section of about ten times larger than th

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5

Dr., H. D. Chaudhari, and Haresh R. Patel Dr. "Antimicrobial and Chemical kinetic studies of Sm3+ rare metal Complex with Benzoxazol derivative." International Journal of Life Sciences Research 10, no. 4 (2022): 35–40. https://doi.org/10.5281/zenodo.7307555.

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<strong>Abstract:</strong> The mixture of some rare metal ions with an important 2-(1,3-Benzoxazole -2-yl - sulfanyl)-N-phenyl acetamide (BSPA) ligand to form coordination complex is an important area of current research. Less explored biologically important 2-(1,3-benzoxazole -2-yl - sulfanyl )-N-phenyl acetamide  ligand is allowed to react with solution of some rare metal perchlorate and attempt has been made to synthesize solid  2-(1,3-benzoxazole -2-yl- sulfanyl )-N-phenyl acetamide complex. These 2-(1,3-benzoxazole-2-yl-sulfanyl)-N-phenyl acetamide complex are subjected to antim

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6

Staniszewska, Monika, Łukasz Kuryk, Aleksander Gryciuk, et al. "In Vitro Anti-Candida Activity and Action Mode of Benzoxazole Derivatives." Molecules 26, no. 16 (2021): 5008. http://dx.doi.org/10.3390/molecules26165008.

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A newly synthetized series of N-phenacyl derivatives of 2-mercaptobenzoxazole, including analogues of 5-bromo- and 5,7-dibromobenzoxazole, were screened against Candida strains and the action mechanism was evaluated. 2-(1,3-benzoxazol-2-ylsulfanyl)-1-(4-bromophenyl)ethanone (5d), 2-(1,3-benzoxazol-2-ylsulfanyl)-1-(2,3,4-trichloro-phenyl)ethanone (5i), 2-(1,3-benzoxazol-2-ylsulfanyl)-1-(2,4,6-trichlorophenyl)ethanone (5k) and 2-[(5-bromo-1,3-benzoxazol-2-yl)sulfanyl]-1-phenylethanone (6a) showed anti-C. albicans SC5314 activity, where 5d displayed MICT = 16 µg/mL (%R = 100) and a weak anti-prol

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7

Imramovsky, Ales, Jan Kozic, Matus Pesko, et al. "Synthesis and Antimycobacterial and Photosynthesis-Inhibiting Evaluation of 2-[(E)-2-Substituted-ethenyl]-1,3-benzoxazoles." Scientific World Journal 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/705973.

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A series of twelve 2-[(E)-2-substituted-ethenyl]-1,3-benzoxazoles was designed. All the synthesized compounds were tested against three mycobacterial strains. The compounds were also evaluated for their ability to inhibit photosynthetic electron transport (PET) in spinach (Spinacia oleraceaL.) chloroplasts. 2-[(E)-2-(4-Methoxyphenyl)ethenyl]-1,3-benzoxazole, 2-[(E)-2-(2,3-dihydro-1-benzofuran-5-yl)ethenyl]-1,3-benzoxazole and 2-{(E)-2-[4-(methylsulfanyl)phenyl]ethenyl}-1,3-benzoxazole showed the highest activity againstM. tuberculosis,M. kansasii,andM. avium, and they demonstrated significantl

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8

Mabied, Ahmed F., Elsayed M. Shalaby, Hamdia A. Zayed, Esmat El-Kholy, Ibrahim S. A. Farag, and Naima A. Ahmed. "Crystal Structure and Stereochemistry Study of 2-Substituted Benzoxazole Derivatives." ISRN Organic Chemistry 2014 (May 13, 2014): 1–7. http://dx.doi.org/10.1155/2014/728343.

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The structure of 2-[(4-chlorophenylazo) cyanomethyl] benzoxazole, C15H9ClN4O (I), has triclinic (P1̅) symmetry. The structure displays N–H⋯N hydrogen bonding. The structure of 2-[(arylidene) cyanomethyl] benzoxazoles, C17H10N2O3 (II), has triclinic (P1̅) symmetry. The structure displays C–H⋯N, C–H⋯C hydrogen bonding. In (I), the chlorophenyl and benzoxazole groups adopt a trans configuration with respect to the central cyanomethyle hydrazone moiety. Compound (II) crystallized with two molecules in the asymmetric unit shows cisoid conformation between cyano group and benzoxazole nitrogen, contr

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9

Glamočlija, Una, Subhash Padhye, Selma Špirtović-Halilović, et al. "Synthesis, Biological Evaluation and Docking Studies of Benzoxazoles Derived from Thymoquinone." Molecules 23, no. 12 (2018): 3297. http://dx.doi.org/10.3390/molecules23123297.

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Thymoquinone (TQ), a natural compound with antimicrobial and antitumor activity, was used as the starting molecule for the preparation of 3-aminothymoquinone (ATQ) from which ten novel benzoxazole derivatives were prepared and characterized by elemental analysis, IR spectroscopy, mass spectrometry and NMR (1H, 13C) spectroscopy in solution. The crystal structure of 4-methyl-2-phenyl-7-isopropyl-1,3-benzoxazole-5-ol (1a) has been determined by X-ray diffraction. All compounds were tested for their antibacterial, antifungal and antitumor activities. TQ and ATQ showed better antibacterial activit

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10

Journal, Baghdad Science. "Synthesis of Some Heterocyclic Compounds Derived from 2-Mercapto Benzoxazole." Baghdad Science Journal 10, no. 3 (2013): 766–78. http://dx.doi.org/10.21123/bsj.10.3.766-778.

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New series of 2-mecapto benzoxazole derivatives (1-20) incorporated into fused to different nitrogen and suphur containing heterocyclic were prepared from 2-meracpto benzoxazole, when treated with hydrazine hydrate to afford 2-hydrazino benzoxazol (1). Compound (1) converted to a variety of pyridazinone andphthalazinone derivatives (2-4) by reaction with different carboxylic anhydride. Also, reaction of (1) with phenyl isothiocyanate and ethyl chloro acetate afforded 3-phenyl-1,3-thiazolidin-2,4-dione-2-(benzoxazole-2-yl-hydrazone) (6). Azomethines (7-10) were prepared through reaction of (1)

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11

Askar, Firyal W., Huda A. Hassan, and Nahida A. Jinzeel. "Synthesis of Some Heterocyclic Compounds Derived from 2-Mercapto Benzoxazole." Baghdad Science Journal 10, no. 3 (2013): 766–78. http://dx.doi.org/10.21123/bsj.2013.10.3.766-778.

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New series of 2-mecapto benzoxazole derivatives (1-20) incorporated into fused to different nitrogen and suphur containing heterocyclic were prepared from 2-meracpto benzoxazole, when treated with hydrazine hydrate to afford 2-hydrazino benzoxazol (1). Compound (1) converted to a variety of pyridazinone andphthalazinone derivatives (2-4) by reaction with different carboxylic anhydride. Also, reaction of (1) with phenyl isothiocyanate and ethyl chloro acetate afforded 3-phenyl-1,3-thiazolidin-2,4-dione-2-(benzoxazole-2-yl-hydrazone) (6). Azomethines (7-10) were prepared through reaction of (1)

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12

Rakas, Anja, Leentje Persoons, Dirk Daelemans, Dajana Kučić Grgić, and Tatjana Gazivoda Kraljević. "A Sustainable Synthesis of Novel 2-(3,4-Disubstituted phenyl)benzoxazole Derivatives and Their Antiproliferative and Antibacterial Evaluation." Molecules 30, no. 8 (2025): 1767. https://doi.org/10.3390/molecules30081767.

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This study describes the synthesis of O-alkylated benzaldehydes 1–8, Schiff bases 9–28, and benzoxazole derivatives 29–48 using microwave, ultrasound, and mechanochemical reactions, as well as reactions in deep eutectic solvents in excellent yields, and their antiproliferative and antibacterial activities. The in vitro evaluation of antiproliferative activity for the newly synthesised benzoxazole derivatives 29–48 against a diverse panel of human cancer cell lines, such as LN-229, Capan-1, HCT-116, NCI-H460, DND-41, HL-60, K-562, and Z-138 demonstrated that the majority of these benzoxazole de

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13

Aruna, G., Ravindra Kulkarni, Baswaraj Machaa, Malathi Jojula, Shravan Gunda, and G. Achaiah. "Design, Synthesis and Evaluation of Aryloxybenzylidene Hydrazinyl-Benzoxazoles/Benzothiazoles Analogs as Antimycobacterial Agents." Asian Journal of Organic & Medicinal Chemistry 5, no. 3 (2020): 185–91. http://dx.doi.org/10.14233/ajomc.2020.ajomc-p272.

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Substituted 2-(2-(4-aryloxybenzylidene)hydrazinyl)benzothiazole/benzoxazoles series were designed through molecular hybridization and synthesized in condensation reaction of hydrazinylbenzothiazole/ benzoxazole with substituted aryloxy benzaldehydes. All the synthesized compounds were assigned structure based on spectral data and were evaluated for antimycobacterial activity. Among both benzothiazole and benzoxazole derivatives, the compounds 8f and 9e were found to show most potent antitubercular activity with MIC value of 0.89 and 0.92 μM which are on a par with those of standard antitubercu

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14

Abdelgawad, Mohamed A., Mohammad M. Al-Sanea, Mohamed A. Zaki, et al. "New Benzoxazole Derivatives as Antiprotozoal Agents: In Silico Studies, Synthesis, and Biological Evaluation." Journal of Chemistry 2021 (March 3, 2021): 1–11. http://dx.doi.org/10.1155/2021/6631868.

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Background. Benzoxazole derivatives have different biological activities. In pursuit of designing novel chemical entities with antiprotozoal and antimicrobial activities, benzoxazolyl aniline was utilized as a privileged scaffold of a series of (3-benzoxazole-2-yl) phenylamine derivatives, 3-benzoxazoloyl acetamide, and butyramide derivatives. Methods. These novel analogs were synthesized in straightforward simple chemistry without any quantitative chromatographic separations in reasonable yields. The biological evaluation of all target compounds as potential antimalarial, antileishmanial, ant

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15

Danilenko, Nadezhda V., Mariia O. Lutsuk, and Andrei I. Khlebnikov. "4-(Benzoxazol-2-yl)phenyl 3-((3-Chloro-1,4-Naphthoquinon-2-yl)amino)phenyl Sulfate." Molbank 2024, no. 4 (2024): M1930. https://doi.org/10.3390/m1930.

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New 4-(benzoxazol-2-yl)phenyl 3-((3-chloro-1,4-naphthoquinon-2-yl)amino)phenyl sulfate was synthesized via the SuFEx click reaction between fluorosulfate-containing 1,4-naphthoquinone and 2-(4-hydroxyphenyl)benzoxazole. 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) was used as an organic base, while triethylamine was inactive in this reaction.

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16

Kumar, Dinesh, Santosh Rudrawar, and Asit K. Chakraborti. "One-Pot Synthesis of 2-Substituted Benzoxazoles Directly from Carboxylic Acids." Australian Journal of Chemistry 61, no. 11 (2008): 881. http://dx.doi.org/10.1071/ch08193.

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Methanesulfonic acid has been found to be a highly effective catalyst for a convenient and one-pot synthesis of 2-substituted benzoxazoles by the reaction of 2-aminophenol with acid chlorides, generated in situ from carboxylic acids. Aryl, heteroaryl, and arylalkyl carboxylic acids provided excellent yields of the corresponding benzoxazoles. The reaction conditions were compatible with various substituents such as chloro, bromo, nitro, methoxy, cyclopentyloxy, phenoxy, thiophenoxy, and conjugated double bonds. Benzoxazole formation was found to be general with respect to substituted 2-aminophe

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17

Podunavac-Kuzmanovic, Sanja, Lidija Jevric, Strahinja Kovacevic, and Natasa Kalajdzija. "A chemometric approach for prediction of antifungal activity of some benzoxazole derivatives against Candida albicans." Acta Periodica Technologica, no. 43 (2012): 273–82. http://dx.doi.org/10.2298/apt1243273p.

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The purpose of the article is to promote and facilitate prediction of antifungal activity of the investigated series of benzoxazoles against Candida albicans. The clinical importance of this investigation is to simplify design of new antifungal agents against the fungi which can cause serious illnesses in humans. Quantitative structure activity relationship analysis was applied on nineteen benzoxazole derivatives. A multiple linear regression (MLR) procedure was used to model the relationships between the molecular descriptors and the antifungal activity of benzoxazole derivatives. Two mathema

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18

Aydın, Abdullah, Zeynep Soyer, Mehmet Akkurt, and Orhan Büyükgüngör. "Crystal structure and theoretical study of N,N-bis[(5-chloro-2-oxo-2,3-dihydrobenzo[d]oxazol-3-yl)methyl]-2-phenylethanamine." Acta Crystallographica Section E Crystallographic Communications 74, no. 5 (2018): 757–60. http://dx.doi.org/10.1107/s2056989018005984.

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In the molecular structure of the title compound, C24H19Cl2N3O4, the three C atoms of the central N,N-dimethylmethanamine moiety are bonded to the N atoms of the two 5-chloro-1,3-benzoxazol-2(3H)-one groups and to the methyl C atom of the methylbenzene group. One of the nine-membered 2,3-dihydro-1,3-benzoxazole rings and the phenyl ring are almost parallel to each other, making a dihedral angle of 5.30 (18)°, but they are almost normal to the mean plane of the other nine-membered 2,3-dihydro-1,3-benzoxazole ring, subtending dihedral angles of 89.29 (16) and 85.41 (18)°, respectively. The cryst

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19

Rostom, Sherif, Hesharn Fahmy, and Manal Ssaudi. "Synthesis and in vitro Anti-HIV Screening of Certain 2-(Benzoxazol-2-ylamino)-3H-4-oxopyrimidines." Scientia Pharmaceutica 71, no. 2 (2003): 57–74. http://dx.doi.org/10.3797/scipharm.aut-03-08.

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Intensive efforts are underway worldwide to develop chemotherapeutic agents effective against HIV, the etiological agent of AIDS. In this view, it was designed to synthesize and investigate the anti-HIV activity of some new 2-(benzoxazol-2-ylamino)-3H-4-oxopyrimidines following the lead benzoxazole (L 697, 661), which was reported to inhibit the spread of the HIV infection by 95 % in MT4 cell culture. Only the 2-(benzoxazol-2-ylarnino)-6-hydroxy-3H-4-oxopyrdine 8 (NSC 722448) was confirmed to exhibit moderate in vitro anti-HIV activity (percentage of protection 76.83 %).

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20

Yarosh, N. O., L. V. Zhilitskaya та I. A. Dorofeev. "Iodomethylation of S-Silylorganyl Mercaptoazole Derivatives with α-Iodoketones". Журнал общей химии 94, № 3 (2024): 410–18. http://dx.doi.org/10.31857/s0044460x24030113.

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The iodomethylation of 2/3-[dimethyl(phenyl)silylmethylthio]-1,3-benzoimidazoles or -1,2,4-triazole with α-iodoketones of the aliphatic and aromatic series in the absence of basic media and solvents leads to formation of unknown salts based on 2/3-mercaptoazolium cations. Reaction of 2-[dimethyl(phenyl)silylmethylthio]-1,3-benzoxazole with α-iodoketones afforded bis(benzoxazol-2-yl)disulfonium derivatives.

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21

Arisoy, Mustafa, Ozlem Temiz-Arpaci, Fatma Kaynak-Onurdag, and Selda Ozgen. "Synthesis and Antimicrobial Evaluation of 2-(p-Substituted Phenyl)-5-[(4-substituted piperazin-1-yl)acetamido]-benzoxazoles." Zeitschrift für Naturforschung C 69, no. 9-10 (2014): 368–74. http://dx.doi.org/10.5560/znc.2014-0024.

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Abstract series of 2-(p-substituted phenyl)-5-(2-{4-[(p-chloro-fluorophenyl)=phenyl] piperazin-1-yl}- acetamido)-benzoxazoles were synthesized and tested for their antimicrobial activities. The structures of the new derivatives were elucidated by spectral techniques. The minimum inhibitory concentrations (MIC) of the new benzoxazoles, along with those of previously synthesized analogues, were determined against standard bacterial and fungal strains and drug-resistant isolates, and compared with those of several reference drugs. The new benzoxazole derivatives were found to possess a broad spec

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22

Yang, Po, and Yi Gu. "Synthesis of a novel benzoxazine containing benzoxazole structure." Chinese Chemical Letters 21, no. 5 (2010): 558–62. http://dx.doi.org/10.1016/j.cclet.2009.12.012.

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23

Kale, Dolly, Gajanan Rashinkar, Audumbar Patil, Arjun Kumbhar, and Rajashri Salunkhe. "Facile Access to 2-Substituted Benzoxazoles Using Sawdust Supported N-Heterocyclic Carbene-Ni Complex via C-H Activation." Letters in Organic Chemistry 17, no. 6 (2020): 479–89. http://dx.doi.org/10.2174/1570178616666190705153927.

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Sawdust supported N-heterocyclic carbene-nickel complex has been prepared by covalent grafting of 1-methyl imidazole in the matrix of chloropropyl modified sawdust followed by reaction with nickel acetate. The resultant NHC-Ni complex was employed as a heterogeneous catalyst for the synthesis of 2-substituted benzoxazoles from benzoxazole and aryl boronic acids following C-H activation strategy. The recycling experiments showed that the complex could be reused for five consecutive runs without significant loss in the yield of products.

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24

Li, Hongchen, Xingyong Wang, Fujun Zhao, Lu Wang, and Songbao Fu. "General Synthesis of 2-Substituted Benzoxazoles Based on Tf2O-Promoted Electrophilic Activation of Tertiary Amides." Molecules 30, no. 7 (2025): 1510. https://doi.org/10.3390/molecules30071510.

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We report a method for the synthesis of 2-substituted benzoxazoles from tertiary amides and 2-aminophenols in the presence of triflic anhydride (Tf2O) and 2-Fluoropyridine (2-F-Pyr). The cascade reaction involves the activation of the amide carbonyl group by Tf2O, nucleophilic addition, intramolecular cyclization, and elimination. Furthermore, we explore the scope of this method by varying both the amide and 2-aminophenol substrates, highlighting its versatility in the synthesis of a wide range of functionalized benzoxazole derivatives.

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25

Danilenko, Nadezhda, Vladimir Shmalyuk, and Andrei Khlebnikov. "2-(2-(Fluorosulfonyloxy)phenyl)benzoxazole." Molbank 2021, no. 3 (2021): M1242. http://dx.doi.org/10.3390/m1242.

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The fluorosulfate derivatives of benzoxazole attract attention since benzoxazole-based compounds have a wide range of biological activities, and the ability of the –SO2F group to react with various functional groups makes it possible to synthesize various new derivatives. The new 2-(2-(fluorosulfonyloxy)phenyl)benzoxazole (2) has been synthesized by the SuFEx click reaction in a two-chamber reactor. Compound 2 is the first example of a benzoxazole derivative with a fluorosulfate-containing substituent at position two of the benzoxazole heterocycle. The anti-cancer potency of 2 was evaluated in

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26

XIAO, DONG, GUILAN ZHANG, HAIYAN WANG, GUOQING TANG, and WENJU CHEN. "INVESTIGATION ON NONLINEAR TRANSMISSION PROPERTY OF EXCITED STATE PROTON TRANSFER MOLECULE 2-(2′-HYDROXYPHENYL)BENZOXAZOLE." Journal of Nonlinear Optical Physics & Materials 09, no. 03 (2000): 309–14. http://dx.doi.org/10.1142/s0218863500000248.

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Nonlinear transmission property of excited state proton transfer molecule 2-(2′-hydroxyphenyl)benzoxazole was investigated at 355 nm and 532 nm using picosecond laser pulses. The experiment result shows that the transmissivity of 2-(2′-hydroxyphenyl)benzoxazole is nonlinear at 355 nm but it is linear at 532 nm. The nonlinear transmissivity of 2-(2′-hydroxyphenyl)benzoxazole originates from the larger nonlinearity of tautomer formed in excited state proton transfer process. Therefore 2-(2′-hydroxyphenyl)benzoxazole might be used as ultrafast optical amplitude limit material.

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27

Mercer, Frank W., Martin T. McKenzie, Maria Bruma, and Burkhard Schulz. "Synthesis and Characterization of New Fluorinated Poly(Imide Benzoxazole)S." High Performance Polymers 8, no. 3 (1996): 395–406. http://dx.doi.org/10.1088/0954-0083/8/3/005.

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We have prepared a series of fluorinated aromatic poly(ether imide benzoxazole)s (PEIBs) and fluorinated aromatic poly(imide benzoxazole)s (PIBs). New PEIBs were prepared by polycondensation of aromatic diamines containing both benzoxazole and hexafluoroisopropylidene groups. New PIBs were prepared by polycondensation of bis( o-aminophenol)s, such as 3,3′-dihydroxybenzidine or 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane, with diacid chlorides containing both imide and hexafluoroisopropylidene groups. We have characterized the solubility, film forming ability, thermal stability and dielec

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28

Syetov, Y. A. "Vibronic structure of absorption spectrum of 2,5-di-(2-benzoxazolyl)phenol." Journal of Physics and Electronics 31, no. 2 (2023): 79–82. http://dx.doi.org/10.15421/332324.

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Vibronic structure of the absorption spectrum of 2,5-di-(2-benzoxazolyl)phenol is calculated using the Franck-Condon approximation and harmonic model for vibrations. 2,5-di-(2-benzoxazolyl)phenol is an organic compound that exhibits excited-state intramolecular proton transfer. It is found that the use of normal modes and values of energy of the electronic states calculated with the B3LYP density functional provides good agreement with the experimental spectrum in terms of the position of intense bands. The largest intensity of vibronic transitions is found for deformation vibrations changing

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29

Piste, Pravina. "Expeditious Microwave-assisted Synthesis of 1,3-Benzoxazoles Incorporating Substituted Thiazolidinone Moieties." International Journal of Pharmaceutical Sciences and Drug Research 15, no. 06 (2023): 757–63. http://dx.doi.org/10.25004/ijpsdr.2023.150609.

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The rapid synthesis of 3-[4-(1,3-benzoxazol-2-yl)phenyl]-2-aryl-1,3-thiazolidin-4-one 4(a-h) was achieved through microwave-assisted methods. This involved the reaction of Schiff bases derived from 2-(4-amino phenyl) benzoxazole 3(a-h) with ethanol, SHCH2COOH (thioglycolic acid) (1 mol, 0.92 mL), and ZnCl2 (5 mol%) under microwave irradiation (400W, 146°C) for 3 to 4 minutes, resulting in excellent yields. Compound precursors 3(a-h) were prepared from aromatic aldehydes and 2-(4-amino phenyl) benzoxazole in ethanol, followed by microwave irradiation for 1 to 2 minutes, with reaction progress m

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30

Dr., H. D. Chaudhari, and Haresh R.Patel Dr. "Chemical kinetic of Dy3+ rare metal Complex with Benzoxazole Derivative." International Journal of Interdisciplinary Research and Innovations 10, no. 4 (2022): 40–45. https://doi.org/10.5281/zenodo.7320022.

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<strong>Abstract:</strong> The combination of some rare metal ions with an important 2-(1,3-benzoxazole -2-yl - sulfanyl )-N-phenyl acetamide (BSPA) ligand to form coordination compounds is an important area of current research. Less explored biologically important 2-(1,3-benzoxazole -2-yl - sulfanyl )-N-phenyl acetamide  ligand is allowed to react with solution of some rare metal perchlorates and attempt has been made to synthesize solid  2-(1,3-benzoxazole -2-yl- sulfanyl )-N-phenyl acetamide complexes. These 2-(1,3-benzoxazole-2-yl-sulfanyl )-N-phenyl acetamide  complexes are

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31

Dr., Haresh R.Patel, and H. D. Chaudhari Dr. "Characterization and bio-chemical synthesis of Gd3+rare metal Complex with benzoxazole derivative." International Journal of Life Sciences Research 10, no. 4 (2022): 27–34. https://doi.org/10.5281/zenodo.7276919.

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<strong>Abstract:</strong> The grouping of some rare metal ions with an significant 2-(1,3-benzoxazole -2-yl - sulfanyl )-N-phenyl acetamide (BSPA) ligand to form coordination compounds is an important area of present research. Less explored biologically important 2-(1,3-benzoxazole -2-yl - sulfanyl )-N-phenyl acetamide  ligand is allowed to react with solution of some rare metal perchlorates and attempt has been made to synthesize solid  2-(1,3-benzoxazole -2-yl- sulfanyl )-N-phenyl acetamide complexes. These 2-(1,3-benzoxazole-2-yl-sulfanyl )-N-phenyl acetamide  complex are su

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32

Nguyen, Hien, Hieu Nguyen Trung, Mai Nguyen Thi Ngoc, May Pham Thi Thu, Hien Nguyen Thi Thu, and Hoan Duong Quoc. "SODIUM SULFIDE-PROMOTED REACTION OF 2-AMINOBENZAMIDE AND BENZYL ALCOHOLS WITH ELEMENTAL SULFUR: A NOVEL APPROACH WITH 2-ARYL-QUINAZOLIN-4(3H)." Journal of Science Natural Science 67, no. 3 (2022): 75–82. http://dx.doi.org/10.18173/2354-1059.2022-0043.

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Six derivatives containing benzoxazole were synthesized from phydroxybenzaldehyde via four step-route in high yields. The benzoxazole cyclization step was promoted with microwave irradiation for 10 to 30 min. Free oaminophenol derivative A3 reacted with aldehydes to form benzoxazole A4a-f, but A3.HCl couldn’t due to the presence of iron (II). Their structures were elucidated with spectroscopic methods: IR, 1D, 2D NMR, and MS.

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Sidra, Lala Rukh, Guofei Chen, Nafeesa Mushtaq, Kai Ma, Beenish Bashir, and Xingzhong Fang. "Processable poly(benzoxazole imide)s derived from asymmetric benzoxazole diamines containing 4-phenoxy aniline: synthesis, properties and the isomeric effect." Polymer Chemistry 9, no. 20 (2018): 2785–96. http://dx.doi.org/10.1039/c8py00382c.

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Mabied, Ahmed F., Elsayed M. Shalaby, Hamdia A. Zayed, Esmat El-Kholy, and Ibrahim S. A. Farag. "Crystal Structure and Molecular Mechanics Modelling of 2-(4-Amino-3-benzyl-2-thioxo-2,3-dihydrothiazol-5-yl)benzoxazole." Journal of Crystallography 2014 (April 27, 2014): 1–5. http://dx.doi.org/10.1155/2014/938360.

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The crystal structure of the title compound, 2-(4-amino-3-benzyl-2-thioxo-2,3-dihydrothiazol-5-yl)benzoxazole, was determined. The crystal has P1 space group and triclinic system with unit cell parameters a = 5.174(3) Å, b = 6.411(6) Å, c = 12.369(10) Å, α = 86.021(4)°, β = 84.384(5)°, and γ = 77.191(5)°. The structure consists of benzoxazole group connected with benzyl via thiazole (attached with amino and thione). Benzoxazole and thiazole rings are almost planar (maximum deviation at C1, −0.013(3) Å, and C10, 0.0041(3) Å, resp.). The phenyl ring is nearly perpendicular to both thiazole and b

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35

Wee, Duyoung, Sungmi Yoo, Young Hun Kang, et al. "Poly(imide-benzoxazole) gate insulators with high thermal resistance for solution-processed flexible indium-zinc oxide thin-film transistors." J. Mater. Chem. C 2, no. 31 (2014): 6395–401. http://dx.doi.org/10.1039/c4tc00709c.

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We have developed poly(imide-benzoxazole) gate insulators with high thermal resistance. The 350 °C-annealed indium-zinc oxide/poly(imide-benzoxazole) thin-film transistors showed excellent performance.

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36

Glamočlija, Una, Selma Špirtović-Halilović, Mirsada Salihović, et al. "Structure of Biologically Active Benzoxazoles: Crystallography and DFT Studies." Acta Chimica Slovenica 68, no. 1 (2021): 144–50. http://dx.doi.org/10.17344/acsi.2020.6237.

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Using X-ray single crystal diffraction, the crystal structures of biologically active benzoxazole derivatives were determined. DFT calculation was performed with standard 6-31G*(d), 6-31G** and 6-31+G* basis set to analyze the molecular geometry and compare with experimentally obtained X-ray crystal data of compounds. The calculated HOMO-LUMO energy gap in compound 2 (2-(2-hydroxynaphtalen-1-yl)-4-methyl-7-isopropyl-1,3-benzoxazol-5-ol) is 3.80 eV and this small gap value indicates that compound 2 is chemically more reactive compared to compounds 1 (4-methyl-2-phenyl-7-isopropyl-1,3-benzoxazol

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Carvalho, Larissa Incerti Santos de, Dalila Junqueira Alvarenga, Letícia Cruz Ferreira do Carmo, et al. "Antifungal Activity of New Eugenol-Benzoxazole Hybrids against Candida spp." Journal of Chemistry 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/5207439.

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Eugenol is a natural allylphenol responsible for a wide range of biological activities, especially antimicrobial. Benzoxazoles are heterocycles with recognized antimicrobial activities. This paper describes the design, synthesis, and the biological results for benzoxazole type derivatives of eugenol as antifungal agents. The products were obtained in good yields by a four-step synthetic sequence involving aromatic nitration, nitroreduction, amide formation, and cycle condensation. They were evaluated against species of Candida spp. in microdilution assays, and four products (5a, 5b′, 5c, and 5

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Malakar, Chandi, Nagaraju Vodnala, Raghuram Gujjarappa, Arup Kabi, Mohan Kumar, and Uwe Beifuss. "Facile Protocols towards C2-Arylated Benzoxazoles using Fe(III)-Catalyzed C(sp 2-H) Functionalization and Metal-Free Domino Approach." Synlett 29, no. 11 (2018): 1469–78. http://dx.doi.org/10.1055/s-0037-1609718.

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Considering their growing attention in the field of medicinal chemistry and drug-discovery research, the facile and convenient approaches towards the preparation of 2-aryl benzoxazole derivatives have been described. The transformation is accomplished by using Fe(III)-catalyzed C–H activation of benzoxazoles with boronic acids to obtain a wide range of C2-arylated benzoxazoles in high yields. The developed method excludes the formation of self-coupling compounds as side products. On the other hand, the synthesis of the products is also achieved via a metal-free domino protocol by the reaction

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39

Paveendra, J., and H. M. Vagdevi. "Synthesis of Novel 3-methyl-1-(5-methyl-1,3-benzoxazol-2-yl)-1H-pyrazol-5-amine Derivatives and In-vitro Evaluation of their Antitumor and Antibacterial Activities." Journal of Pharmaceutical Research International 35, no. 13 (2023): 25–35. http://dx.doi.org/10.9734/jpri/2023/v35i137367.

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Benzoxazole is one of the biologically important heterocyclic compounds, which shows remarkable pharmacological activities. In this work, 3-methyl-1-(5-methyl-1,3-benzoxazol-2-yl)-1H-pyrazol-5-amine derivatives have been synthesized by using mild protocol under solvent free condition. Structures of the synthesized compounds have been confirmed through IR, 1H NMR, 13C NMR and Mass spectral methods. All the compounds were assessed for their antitumor and antibacterial activities. 6h has found remarkable activity on both antitumor and antibacterial studies and 6g and 6a exhibited promising antiba

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Dr., H. D. Chaudhari, and Haresh R.Patel Dr. "Chemical kinetic activity of Iridium rare metal Complex with Banzoxazole Derivative." International Journal of Life Sciences Research 12, no. 4 (2024): 1–4. https://doi.org/10.5281/zenodo.13902116.

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<strong>Abstract:</strong> The combination of Iridium rare metal ions with an important 2-(1,3-benzoxazole -2-yl - sulfanyl )-N-phenyl acetamide (BSPA) ligand to form coordination compounds is an important area of current research. Less explored biologically important 2-(1,3-benzoxazole -2-yl - sulfanyl )-N-phenyl acetamide  ligand is allowed to react with solution of some rare metal perchlorates and attempt has been made to synthesize solid  2-(1,3-benzoxazole -2-yl- sulfanyl )-N-phenyl acetamide complexes. These 2-(1,3-benzoxazole-2-yl-sulfanyl )-N-phenyl acetamide  complexes

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Zhang, Kan, Ruilong Cai, Qixin Zhuang, Xiaoyun Liu, Guang Yang, and Zhewen Han. "High performance crosslinked system based on reaction of benzoxazine with benzoxazole." Journal of Polymer Science Part A: Polymer Chemistry 52, no. 11 (2014): 1514–18. http://dx.doi.org/10.1002/pola.27153.

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Howie, R. Alan, Abdul Jabbar, John R. Lewis, Shaikh S. Nizami, and Craig F. Ritchie. "2-(2,1-Benzoxazol-3-yl)-3,5-dimethoxyphenol and 3-phenyl-2,1-benzoxazole." Acta Crystallographica Section C Crystal Structure Communications 59, no. 9 (2003): o516—o519. http://dx.doi.org/10.1107/s0108270103015713.

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43

Andriyankova, L. V., N. D. Abramova, and �. I. Kositsyna. "Cyanoacetylenes in a reaction with benzoxazole-2-thione and benzoxazol-2-one." Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 39, no. 6 (1990): 1254–55. http://dx.doi.org/10.1007/bf00962393.

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S, Akhila, Hima C. S, and Shaiju S Dharan. "Chemistry and Pharmacological Exploration of Benzoxazole Derivatives." International Journal of Research and Review 9, no. 12 (2022): 334–41. http://dx.doi.org/10.52403/ijrr.20221237.

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Benzoxazole is one of the most prominent heterocyclic structures and is found in an extensive range of biologically active compounds. It is one of the often occurring heterocyclic nitrogen-containing moieties that perform as the primary active elements of pharmaceutical compounds. It can be viewed as isosteres of the naturally occurring guanine and adenine nucleic bases since they interact effectively with the polymeric components of biological systems. A wide range of biological features, including analgesic, antibacterial, anti-inflammatory, anti-hyperglycemic, anticancer, antiviral, antifun

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Cheng, Ziqian, Qingbo Zhang, Jing Peng, et al. "Genomics-Driven Discovery of Benzoxazole Alkaloids from the Marine-Derived Micromonospora sp. SCSIO 07395." Molecules 28, no. 2 (2023): 821. http://dx.doi.org/10.3390/molecules28020821.

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Benzoxazole alkaloids exhibit a diverse array of structures and interesting biological activities. Herein we report the identification of a benzoxazole alkaloid-encoding biosynthetic gene cluster (mich BGC) in the marine-derived actinomycete Micromonospora sp. SCSIO 07395 and the heterologous expression of this BGC in Streptomyces albus. This approach led to the discovery of five new benzoxazole alkaloids microechmycin A–E (1–5), and a previously synthesized compound 6. Their structures were elucidated by HRESIMS and 1D and 2D NMR data. Microechmycin A (1) showed moderate antibacterial activit

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46

Garrido, Amanda, Pierre-Olivier Delaye, François Quintin, et al. "Direct Access to Highly Functionalised Benzimidazoles and Benzoxazoles from a Common Precursor." Synthesis 51, no. 21 (2019): 4006–13. http://dx.doi.org/10.1055/s-0039-1690153.

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Benzoxazole and benzimidazole are commonly encountered heterocycles in medicinal chemistry and their functionalisation around 1-, 2-, 5-, and/or 6-positions provides a wide range of molecules of biological interest. In this manuscript, a straightforward preparation of diversely and highly substituted benzimidazoles and benzoxazoles on these positions, from a common starting material, a 3,3-dibromoacrolein, is described. Such acrolein derivatives are almost never described in the literature or used as ‘building-block’ for organic synthesis. The double electrophilicity of this substrate was foun

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Skrzypek, Alicja, Monika Karpińska, Małgorzata Juszczak, et al. "Cholinesterases Inhibition, Anticancer and Antioxidant Activity of Novel Benzoxazole and Naphthoxazole Analogs." Molecules 27, no. 23 (2022): 8511. http://dx.doi.org/10.3390/molecules27238511.

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Benzoxazole and naphthoxazole fused systems are found in many biologically active molecules. Novel benzoxazole and naphthoxazole analogs functionalized by the 2,4-dihydroxyphenyl moiety were designed, obtained and evaluated as a broad spectrum of biological potency compounds. Sulfinylbis[(2,4-dihydroxyphenyl)methanethione] or its analogs and 2-aminophenols or 1-amino-2-naphthol were used as starting reagents. 4-(Naphtho[1,2-d][1,3]oxazol-2-yl)benzene-1,3-diol was identified as the most promising compound of the nanomolar activity against AChE (IC50 = 58 nM) of the mixed-type inhibition and of

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Guzow, Katarzyna, Ewa Mulkiewicz, Michał Obuchowski, and Wiesław Wiczk. "Biological activity of 3-(2-benzoxazol-5-yl)alanine derivatives." Amino Acids 53, no. 8 (2021): 1257–68. http://dx.doi.org/10.1007/s00726-021-03030-7.

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AbstractSearching for new drugs is still a challenge for science, mainly because of civilization development and globalization which promote the rapid spread of diseases, which is particularly dangerous in the case of infectious ones. Moreover, readily available already known antibiotics are often overused or misused, possibly contributing to the increase in the number of multidrug-resistant microorganisms. A consequence of this is the need for new structures of potential drugs. One of them is a benzoxazole moiety, a basic skeleton of a group of fluorescent heterocyclic compounds already widel

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Verma, Arvind Kumar, Arun Kumar, and Kunwar Abhishek Singh. "Synthesis and molecular docking for anticonvulsant activity of some new benzoxazole derivatives." INDIAN JOURNAL OF HETEROCYCLIC CHEMISTRY 35, no. 02 (2025): 551. https://doi.org/10.59467/ijhc.2025.35.551.

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To explore the anticonvulsant action related to the benzoxazole framework, a series of benzoxazole-piperazine derivatives, namely N-(4-(benzo[d]oxazol-2-yl)phenyl)-2-(piperazin-1-yl) acetamides (3a-e) (3), was synthesized by reacting N-(4-(benzo[d]oxazol-2-yl)phenyl)-2-chloroacetamide (2) with various substituted piperazines. Molecular docking studies were conducted using Auto Dock Vina 1.5.7 to evaluate the compounds' binding affinities with anticonvulsant-related targets protein data bank ID: 3PO7, 7WLJ, using zonisamide as a standard drug to ensure their potential. Several compounds exhibit

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Agag, Tarek, Jia Liu, Robert Graf, Hans W. Spiess, and Hatsuo Ishida. "Benzoxazole Resin: A Novel Class of Thermoset Polymer via Smart Benzoxazine Resin." Macromolecules 45, no. 22 (2012): 8991–97. http://dx.doi.org/10.1021/ma300924s.

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