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Rajput K, Singh V, Mahaur P, Singh S, Srivastava V. Visible-light-induced C-S bond formation in the synthesis of 2,4-disubstituted thiazoles through cascade difunctionalization of acetophenone: a greener approach. Org Biomol Chem 2024; 22:2774-2779. [PMID: 38497383 DOI: 10.1039/d4ob00096j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
A groundbreaking approach has been developed for synthesizing 2,4-disubstituted thiazoles using an eco-friendly and metal-free approach. This novel method utilizes methyl aryl ketones, N-bromo-succinimide (NBS), and thioamides in water as a green reaction medium under visible light irradiation. Using NBS as a bromine source, the reaction takes place through an in situ α-bromination method. This approach does not require any catalyst, which makes it exceptionally beneficial for the environment. The advantages of this efficient approach are manifold and include the use of greener conditions, absence of metals, easy isolation of products, cost-effectiveness, non-toxicity, and reliance on renewable energy sources like visible light. Moreover, this technique offers higher product purity and excellent yield, enhancing itsappeal.
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Affiliation(s)
- Khushbu Rajput
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi-221 005, U.P., India.
| | - Vishal Singh
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi-221 005, U.P., India.
| | - Priya Mahaur
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi-221 005, U.P., India.
| | - Sundaram Singh
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi-221 005, U.P., India.
| | - Vandana Srivastava
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi-221 005, U.P., India.
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de Araújo ACJ, Freitas PR, Araújo IM, Siqueira GM, de Oliveira Borges JA, Alves DS, Miranda GM, Dos Santos Nascimento IJ, de Araújo-Júnior JX, da Silva-Júnior EF, de Aquino TM, Junior FJBM, Marinho ES, Dos Santos HS, Tintino SR, Coutinho HDM. Potentiating-antibiotic activity and absorption, distribution, metabolism, excretion and toxicity properties (ADMET) analysis of synthetic thiadiazines against multi-drug resistant (MDR) strains. Fundam Clin Pharmacol 2024; 38:84-98. [PMID: 37649138 DOI: 10.1111/fcp.12950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 08/03/2023] [Accepted: 08/10/2023] [Indexed: 09/01/2023]
Abstract
BACKGROUND Thiadiazines are heterocyclic compounds that contain two nitrogen atoms and one sulfur atom in their structure. These synthetic molecules have several relevant pharmacological activities, such as antifungal, antibacterial, and antiparasitic. OBJECTIVES The present study aimed to evaluate the possible in vitro and in silico interactions of compounds derived from thiadiazines. METHODS The compounds were initially synthesized, purified, and confirmed through HPLC methodology. Multi-drug resistant bacterial strains of Staphylococcus aureus 10 and Pseudomonas aeruginosa 24 were used to evaluate the direct and modifying antibiotic activity of thiadiazine derivatives. ADMET assays (absorption, distribution, metabolism, excretion, and toxicity) were conducted, which evaluated the influence of the compounds against thousands of macromolecules considered as bioactive targets. RESULTS There were modifications in the chemical synthesis in carbon 4 or 3 in one of the aromatic rings of the structure where different ions were added, ensuring a variability of products. It was possible to observe results that indicate the possibility of these compounds acting through the cyclooxygenase 2 mechanism, which, in addition to being involved in inflammatory responses, also acts by helping sodium reabsorption. The amine group present in thiadiazine analogs confers hydrophilic characteristics to the substances, but this primary characteristic has been altered due to alterations and insertions of other ligands. The characteristics of the analogs generally allow easy intestinal absorption, reduce possible hepatic toxic effects, and enable possible neurological and anti-inflammatory action. The antibacterial activity tests showed a slight direct action, mainly of the IJ23 analog. Some compounds were able to modify the action of the antibiotics gentamicin and norfloxacin against multi-drug resistant strains, indicating a possible synergistic action. CONCLUSIONS Among all the results obtained in the study, the relevance of thiadiazine analogs as possible coadjuvant drugs in the antibacterial, anti-inflammatory, and neurological action with low toxicity is clear. Need for further studies to verify these effects in living organisms is not ruled out.
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Affiliation(s)
| | - Priscilla Ramos Freitas
- Laboratory of Microbiology and Molecular Biology, LMBM, Universidade Regional do Cariri, Crato, Brazil
| | - Isaac Moura Araújo
- Laboratory of Microbiology and Molecular Biology, LMBM, Universidade Regional do Cariri, Crato, Brazil
| | - Gustavo Miguel Siqueira
- Laboratory of Microbiology and Molecular Biology, LMBM, Universidade Regional do Cariri, Crato, Brazil
| | | | - Daniel Sampaio Alves
- Laboratory of Microbiology and Molecular Biology, LMBM, Universidade Regional do Cariri, Crato, Brazil
| | | | - Igor José Dos Santos Nascimento
- Laboratory of Medicinal Chemistry, Institute of Pharmaceutical Sciences, Federal University of Alagoas, Maceió, Alagoas, Brazil
| | - João Xavier de Araújo-Júnior
- Laboratory of Medicinal Chemistry, Institute of Pharmaceutical Sciences, Federal University of Alagoas, Maceió, Alagoas, Brazil
| | - Edeildo Ferreira da Silva-Júnior
- Biological and Molecular Chemistry Research Group, Institute of Chemistry and Biotechnology, Federal University of Alagoas, Maceió, Alagoas, Brazil
| | - Thiago Mendonça de Aquino
- Laboratory of Synthesis and Research in Medicinal Chemistry, Research Group on Therapeutic Strategies - GPET, Institute of Chemistry and Biotechnology, Federal University of Alagoas, Maceió, Alagoas, Brazil
| | | | - Emmanuel Silva Marinho
- Laboratory of Chemistry of Natural and Synthetic Product, State University of Ceará, UECE, Fortaleza, Ceará, Brazil
| | - Helcio Silva Dos Santos
- Laboratory of Chemistry of Natural and Synthetic Product, State University of Ceará, UECE, Fortaleza, Ceará, Brazil
| | - Saulo Relison Tintino
- Laboratory of Microbiology and Molecular Biology, LMBM, Universidade Regional do Cariri, Crato, Brazil
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Chedupaka R, Papisetti V, Sangolkar AA, Vedula RR. A Facile One-Pot Synthesis of Benzimidazole-Linked Pyrrole Structural Motifs via Multicomponent Approach: Design, Synthesis, and Molecular Docking Studies. Polycycl Aromat Compd 2021. [DOI: 10.1080/10406638.2021.1995010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Raju Chedupaka
- Department of Chemistry, National Institute of Technology, Warangal, Telangana, India
| | - Venkatesham Papisetti
- Department of Chemistry, National Institute of Technology, Warangal, Telangana, India
| | | | - Rajeswar Rao Vedula
- Department of Chemistry, National Institute of Technology, Warangal, Telangana, India
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Srivastava V, Singh PK, Srivastava A, Singh PP. Recent application of visible-light induced radicals in C-S bond formation. RSC Adv 2020; 10:20046-20056. [PMID: 35520400 PMCID: PMC9054237 DOI: 10.1039/d0ra03086d] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Accepted: 04/29/2020] [Indexed: 01/20/2023] Open
Abstract
The sulphur centered radicals, produced from various organic compounds, in high efficiency by single-electron-transfer (SET) oxidation. These radicals are highly reactive intermediates having various applications in the construction of organosulphur compounds in the field of synthetic organic chemistry. These S-centred radical-mediated organic transformations have been achieved using photoredox catalysts, including organic dyes and transition metal catalysts, as well as in the absence of any catalyst. Compared with previous methods, photoredox catalysis is inexpensive and features the advantages of being environmentally benign, highly efficient and easy to use. This review focuses on recent developments in the photocatalyzed carbon-sulphur bond formation.
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Affiliation(s)
- Vishal Srivastava
- Department of Chemistry, CMP Degree College, University of Allahabad Prayagraj 211002 India
| | - Pravin K Singh
- Department of Chemistry, CMP Degree College, University of Allahabad Prayagraj 211002 India
| | - Arjita Srivastava
- Department of Chemistry, CMP Degree College, University of Allahabad Prayagraj 211002 India
| | - Praveen P Singh
- Department of Chemistry, United College of Engineering & Research Naini Prayagraj 211010 India
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