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Syntheses of benzhydryl 2-propanoyl-functionalized trithiocarbonates and its use as chain transfer agents in the RAFT polymerization of styrene. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2021.110719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Gaba J, Sharma S, Kaur P, Joshi S. Synthesis and Biological Evaluation of Thymol Functionalized Oxadiazole thiol, Triazole thione and β-lactam Derivatives. LETT ORG CHEM 2021. [DOI: 10.2174/1570178617999200807213410] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In the present study, different derivatives of thymol (1) viz. hydrazide (2), oxadiazole thiol
(3), triazole thione (4), hydrazones (5-7), and β-lactams (8-10) were synthesized. All synthesized
compounds were identified and characterized using elemental analysis, UV-Visible, <sup>1</sup>H NMR, <sup>13</sup>C
NMR, and IR spectroscopic techniques. Synthesized thymol derivatives were evaluated for antifungal
potential against phytopathogenic fungi Fusarium moniliforme, Rhizoctonia solani, and Dreschlera
maydis of maize in comparison to recommended standards in terms of percent inhibition and ED50 values.
Thymol was more effective as compared to its derivatives against all three tested fungi. Hydrazones
(5-7) and β-lactams (8-10), having m-NO<sub>2</sub> substituted phenyl ring (6, 9), were less effective as
compared to o-NO<sub>2</sub> and p-NO<sub>2</sub> analogs against F. moniliforme and R. solani, however, the reverse
trend was observed against D. maydis. Thymol and its derivatives were also tested for insecticidal activity
against stored grain (chickpea) insect Callosobruchus chinensis and various parameters viz. egg
laying, adult emergence, and grain damage were recorded and compared. Compounds having oxadiazole
thiol (3) and triazole thione (4) moiety showed promising effects against insect C. chinensis.
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Affiliation(s)
- Jyoti Gaba
- Department of Chemistry, Punjab Agricultural University, Ludhiana 141004,India
| | - Sunita Sharma
- Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, 141004,India
| | - Pardeep Kaur
- Department of Chemistry, Punjab Agricultural University, Ludhiana 141004,India
| | - Sukesha Joshi
- Department of Chemistry, Punjab Agricultural University, Ludhiana 141004,India
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Xiao T, Liu K, Huigens RW. Progress towards a stable cephalosporin-halogenated phenazine conjugate for antibacterial prodrug applications. Bioorg Med Chem Lett 2020; 30:127515. [PMID: 32860978 DOI: 10.1016/j.bmcl.2020.127515] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 08/18/2020] [Accepted: 08/20/2020] [Indexed: 02/07/2023]
Abstract
Resistant bacteria successfully evade the action of conventional antibiotic therapies during infection, often leading to significant illness and death. Our lab has discovered halogenated phenazine (HP) analogues which demonstrate potent antibacterial activities through a unique iron-starving mechanism. Herein, we describe synthetic efforts towards a stable cephalosporin-HP conjugate prodrug with the aim of translating HPs into useful clinical agents. Cephalosporin-antibiotic conjugates offer multiple advantages for antibacterial design, including the release of active agents through the targeting of intracellular cephalosporinase following selective ring-opening of the beta-lactam warhead. During these studies, carbonate-linked cephalosporin-HP conjugate 16 was synthesized; however, we were unable to successfully remove the ester group required for cephalosporinase processing. Cephalosporin-HP 16 was then utilized as a probe to investigate the stability of the carbonate linker in antibacterial assays and, as predicted, this compound proved to be inactive against Staphylococcus aureus (MIC > 100 µM). The lack of 16's antibacterial activity can be attributed to the carbonate linker remaining intact throughout the MIC assay, thus not liberating the active HP moiety. These efforts have led to a more stable cephalosporin-HP conjugate joined through a carbonate linker compared to a highly unstable ether linked analogue we previously reported.
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Affiliation(s)
- Tao Xiao
- Department of Medicinal Chemistry, Center for Natural Products, Drug Discovery and Development (CNPD3), College of Pharmacy, University of Florida, Gainesville, FL 32610, United States
| | - Ke Liu
- Department of Medicinal Chemistry, Center for Natural Products, Drug Discovery and Development (CNPD3), College of Pharmacy, University of Florida, Gainesville, FL 32610, United States
| | - Robert W Huigens
- Department of Medicinal Chemistry, Center for Natural Products, Drug Discovery and Development (CNPD3), College of Pharmacy, University of Florida, Gainesville, FL 32610, United States
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Otani T, Miyoshi M, Shibata T, Matsuo T, Hashizume D, Tamao K. Thermally Stable Monosubstituted Thiophene 1-Oxide and 1-Imides Stabilized by a Bulky Rind Group at Their 3-Position: Synthesis, Structure, and Inversion Barriers on the Sulfur Atom. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2017. [DOI: 10.1246/bcsj.20170042] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Takashi Otani
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555
- Functional Elemento-Organic Chemistry Unit, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198
- Course of Chemical Engineering, National Institute of Technology, Anan College, 265 Aoki Minobayashi, Anan, Tokushima 774-0017
| | - Mayu Miyoshi
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555
| | - Takanori Shibata
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555
| | - Tsukasa Matsuo
- Functional Elemento-Organic Chemistry Unit, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502
| | - Daisuke Hashizume
- Materials Characterization Support Unit, RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198
| | - Kohei Tamao
- Functional Elemento-Organic Chemistry Unit, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198
- RIKEN Global Research Cluster, 2-1 Hirosawa, Wako, Saitama 351-0198
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Identification of components of Brazilian honey by 1H NMR and classification of its botanical origin by chemometric methods. Lebensm Wiss Technol 2012. [DOI: 10.1016/j.lwt.2012.04.024] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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