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Fernandes GFS, Campos DL, Da Silva IC, Prates JLB, Pavan AR, Pavan FR, Dos Santos JL. Benzofuroxan Derivatives as Potent Agents against Multidrug-Resistant Mycobacterium tuberculosis. ChemMedChem 2021; 16:1268-1282. [PMID: 33410233 DOI: 10.1002/cmdc.202000899] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 01/06/2021] [Indexed: 12/13/2022]
Abstract
Tuberculosis (TB) is currently the leading cause of death related to infectious diseases worldwide, as reported by the World Health Organization. Moreover, the increasing number of multidrug-resistant tuberculosis (MDR-TB) cases has alarmed health agencies, warranting extensive efforts to discover novel drugs that are effective and also safe. In this study, 23 new compounds were synthesized and evaluated in vitro against the drug-resistant strains of M. tuberculosis. The compound 6-((3-fluoro-4-thiomorpholinophenyl)carbamoyl)benzo[c][1,2,5]oxadiazole 1-N-oxide (5 b) was particularly remarkable in this regard as it demonstrated MIC90 values below 0.28 μM against all the MDR strains evaluated, thus suggesting that this compound might have a different mechanism of action. Benzofuroxans are an attractive new class of anti-TB agents, exemplified by compound 5 b, with excellent potency against the replicating and drug-resistant strains of M. tuberculosis.
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Affiliation(s)
- Guilherme F S Fernandes
- School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara Jaú Highway KM 01, 14800903, Araraquara, Brazil.,Institute of Chemistry, São Paulo State University (UNESP), Francisco Degni Street 55, 14800060, Araraquara, Brazil
| | - Débora L Campos
- School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara Jaú Highway KM 01, 14800903, Araraquara, Brazil
| | - Isabel C Da Silva
- School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara Jaú Highway KM 01, 14800903, Araraquara, Brazil
| | - João L B Prates
- School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara Jaú Highway KM 01, 14800903, Araraquara, Brazil.,Institute of Chemistry, São Paulo State University (UNESP), Francisco Degni Street 55, 14800060, Araraquara, Brazil
| | - Aline R Pavan
- School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara Jaú Highway KM 01, 14800903, Araraquara, Brazil.,Institute of Chemistry, São Paulo State University (UNESP), Francisco Degni Street 55, 14800060, Araraquara, Brazil
| | - Fernando R Pavan
- School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara Jaú Highway KM 01, 14800903, Araraquara, Brazil
| | - Jean L Dos Santos
- School of Pharmaceutical Sciences, São Paulo State University (UNESP), Araraquara Jaú Highway KM 01, 14800903, Araraquara, Brazil.,Institute of Chemistry, São Paulo State University (UNESP), Francisco Degni Street 55, 14800060, Araraquara, Brazil
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Saha A, Shetty A, Pavan AR, Chattopadhyay S, Shibata T, Viswanatha R. Uniform Doping in Quantum-Dots-Based Dilute Magnetic Semiconductor. J Phys Chem Lett 2016; 7:2420-2428. [PMID: 27295453 DOI: 10.1021/acs.jpclett.6b01099] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Effective manipulation of magnetic spin within a semiconductor leading to a search for ferromagnets with semiconducting properties has evolved into an important field of dilute magnetic semiconductors (DMS). Although a lot of research is focused on understanding the still controversial origin of magnetism, efforts are also underway to develop new materials with higher magnetic temperatures for spintronics applications. However, so far, efforts toward quantum-dots(QDs)-based DMS materials are plagued with problems of phase separation, leading to nonuniform distribution of dopant ions. In this work, we have developed a strategy to synthesize highly crystalline, single-domain DMS system starting from a small magnetic core and allowing it to diffuse uniformly inside a thick CdS semiconductor matrix and achieve DMS QDs. X-ray absorption fine structure (XAFS) spectroscopy and energy-dispersive X-ray spectroscopy-scanning transmission electron microscopy (STEM-EDX) indicates the homogeneous distribution of magnetic impurities inside the semiconductor QDs leading to superior magnetic property. Further, the versatility of this technique was demonstrated by obtaining ultra large particles (∼60 nm) with uniform doping concentration as well as demonstrating the high quality magnetic response.
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Affiliation(s)
| | | | | | - Soma Chattopadhyay
- Sector 10 ID, CSRRI-IIT, Advanced Photon Source, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
- Advanced Materials Group, Physics Department, Illinois Institute of Technology , Chicago, Illinois 60616, United States
| | - Tomohiro Shibata
- MRCAT, Argonne National Laboratory , Argonne, Illinois 60439, United States
- Advanced Materials Group, Physics Department, Illinois Institute of Technology , Chicago, Illinois 60616, United States
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